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Technological aids for improving longitudinal research on substance use disorders
© Farabee et al. 2016
- Received: 30 May 2015
- Accepted: 4 August 2016
- Published: 10 August 2016
There is a broad consensus that addictive behaviors tend to be chronic and relapsing. But for field studies of substance users, successfully tracking, locating, and following up with a representative sample of subjects is a challenge.
The purpose of this paper is to provide a general overview of how current technological aids can support and improve the quality of longitudinal research on substance use disorders. The review is grouped into four domains: (1) tracking and locating, (2) prompting/engaging, (3) incentivizing, and (4) collecting data.
Results & conclusions
Although the technologies described in this review will be modified or replaced over time, our findings suggest that incorporating some or all of these currently available approaches may improve research efficiency, follow-up rates, and data quality.
- Social Networking Site
- Short Message Service
- Card Payment
- Ecological Momentary Assessment
- Debit Card
The past 20 years have seen substantial changes in our understanding of substance use disorder (SUD). It is no longer viewed as deviant behavior committed by the morally weak; nor is a single, episodic intervention considered to be effective treatment . SUD is considered to be a chronic problem, associated with high rates of morbidity, mortality, and other adverse conditions . This emerging recognition has underscored the importance of studying the epidemiology, natural history, and treatment of substance use disorders over the long term. Indeed, as former director of the National Institute on Drug Abuse (NIDA), Alan Leshner, noted, “…we will make progress in dealing with drug issues only when our national discourse and our strategies are as complex and comprehensive as the problem itself” .
However, capturing the complexity of SUD over time requires high rates of study sample retention. This can be a challenge with individuals who have unstable living conditions and/or frequent criminal justice involvement. One meta-analysis of 85 longitudinal studies of substance abuse clients found that nearly one-third of subjects were lost to attrition within 36 months . A more recent survey of NIDA-funded investigators engaged in longitudinal research found that 27 % of the studies fell below the 80 % guideline for program follow-up rates [5, 6]. Although there is a lack of evidence for a strict cut off for research findings, this poses a significant threat to the validity of findings in the SUD literature, as follow-up rates below 80 % have been shown to produce dramatically biased estimates of drug use and related behaviors . For example, participants who remain in longitudinal studies of SUD treatment outcomes differ from study dropouts/non-responders in levels of treatment participation, use of other drugs, and level of education [8, 9].
Fortunately, a number of technological advances have emerged—or become sufficiently commonplace—that improve researchers’ ability to maintain high follow-up rates in longitudinal studies. This paper summarizes some of these technological aids with regard to their ability to locate, engage, and incentivize research participants over time and facilitate data collection.
The retention of subjects at adequate levels is necessary both to maintain statistical power and to reduce attrition bias in resultant follow-up samples. Subject retention is particularly challenging when study samples are drawn from populations characterized by residential instability, contact with the criminal justice system, and problems in psychosocial functioning, as is often the case in stu dies of individuals with SUDs. Inadequate sample size due to attrition has long been documented in review and meta-analytic publications as a threat to power, impacting the internal and external validity of longitudinal studies (e.g., [10–12]). Hence, well-established methods have been developed and refined to enhance subject retention in longitudinal studies of substance users and other vulnerable populations [13–17] to increase their participation in ongoing follow-up interviews [18, 19]; and to address human subject concerns regarding privacy and confidentiality of study participants . Standard procedures utilized in longitudinal research include collection of detailed personal information from participants at study intake, including obtaining participants’ consent to contact family members and others who may be able to provide information on their whereabouts; frequently contacting study participants (by mail or phone) to maintain rapport, update locator information, remind participants of scheduled interviews, and enhance their connection to the study; using monetary or non-cash incentives to increase willingness to participate in ongoing interviews [13, 18, 21]; and using publicly available records, Internet-based search engines, or subscription-based databases (e.g., LexisNexus) to track individuals who have lost contact with the study. When resources have permitted it, some studies have sent interviewers into the field to track subjects at local hangouts or public places, hoping to find hard-to-locate participants and induce their participation through face-to-face contact .
Given the large body of research with substance users, methods for tracking, locating, and retaining them in longitudinal studies have become increasingly more sophisticated over time, including the use of empirically based methods that enhance follow-up rates. For example, several studies have examined the characteristics of individuals associated with study sample attrition [22–25] the optimal amount and schedule of remuneration to maximize retention [18, 26] and the relationship of number of follow-up attempts with study retention and participant outcomes [27–32]. As a result, follow-up methods have been tailored for specific subpopulations of participants recruited from different study sites (e.g., hospital emergency rooms, general medical clinics, specialty clinics) or types of participants (e.g., adolescents, individuals with co-occurring disorders). Efforts to systematically evaluate the effectiveness of follow-up efforts have led to the conclusion that the use of multiple strategies (e.g., telephone, database searches, mailed reminders), the scaled use of resources to target the hardest-to-locate participants with more intensive methods, the use of schedules of increasing subject payment, flexibility in scheduling field interviews, and persistence are required to maximize follow-up rates [31, 33].
Paralleling recent developments in intervention research that have used mHealth or Internet-based strategies to deliver treatment or continuing care, methods for tracking and retaining study participants in longitudinal research are similarly incorporating new technologies to enhance subject retention. As investigators increasingly incorporate these methods in follow-up research, new issues and challenges have arisen. We briefly review these issues with regard to: (1) use of cell phones, (2) use of social networking sites, and (3) use of Internet databases for tracking and locating.
Cell phones have become an important means for delivering treatment and continuing care interventions for substance-using populations, both through text messaging and smartphone applications . An initial concern regarding the incorporation of cell phones within research and follow-up efforts has been whether substance-using participants, particularly those who are impoverished and/or homeless, have access to them. In formative survey research for developing a mobile phone intervention to sustain recovery among women offenders, Scott and colleagues  found that 83 % of the women had cell phones and 30 % of those were smartphones. Reported comfort level with use of cell phones was high, although many had access only through prepaid minutes, rather than through extended plans. In a survey and semi-structured interviews conducted with research staff from 10 sites participating in the NIDA Clinical Trials Network, Mitchell and colleagues  found that interviewers perceived cell phones to be especially advantageous for retaining contact with participants who were residentially unstable and did not have landlines.
Social networking sites
Social networking sites provide an opportunity to engage study participants by establishing a study profile, which can utilize study logos and other ways to “brand” the study. Researchers are able to conduct Facebook searches and send private emails to study participants who are located. As with cell phones, questions about the extent of involvement of study participants in social networking pertain to its potential utility for maintaining contact with study participants. The utility of these approaches may be limited with older generations who are not active users of social networking, as was found in a study that used social networking sites (Facebook and Friends Reunited) to locate participants in studies of childhood behavior from decades earlier . However, researchers participating in the NIDA CTN found that many homeless individuals routinely had access to the Internet through public libraries, and were able to send and receive emails to study investigators .
Despite the potential limitations in access for some study participants, several studies have successfully used social networking to locate respondents, including in a longitudinal study of methamphetamine users  and a study of children involved in social welfare services . One study found Facebook to be effective in locating hard-to-reach participants who had participated in an intervention program for children in at-risk families, reducing study attrition by 16 % . Further, the investigators found some differences in characteristics of the children located via their mothers’ Facebook site, including ethnicity (more likely to be White or Aboriginal than recent immigrants) and language receptivity, which was higher among those located through Facebook.
Internet for tracking and locating
Although use of public records has long been a tool for tracking and locating respondents, Internet access through various search engines has vastly expanded access to the broad range of information that is available online. However, there is also increasing attention to privacy concerns, particularly related to protected health information and other confidential information. Recent security breaches that have targeted commercial vendors, government databases, and health providers have heightened concerns about the ramifications of access to information in ways that may pose harm to individuals.
Freely available Internet tools include web search engines, such as Google, Yahoo, People Search, and Bing, among others; telephone directories, including reverse directories that use telephone numbers to generate addresses; criminal justice records from county jails, state Departments of Corrections, or the Federal Bureau of Prisons; death records obtained through online obituaries, state Vital Records, or the National Death Index; and subscription-based people-finder services, such as Checkmate and People Smart. Access to some sites, such as the Social Security Death Index, requires date of birth and use of the participant’s social security number, and also require a fee. Several studies have closely tracked their experiences with these various databases and methods, and compiled useful recommendations for ways to maximize their application [36, 41, 42].
A study’s use of these search engines needs to be clearly communicated to study participants at the time of intake, including solicitation of their consent for their use. Upon study intake, researchers may benefit from initiating these strategies, such as conducting Internet-based searches and developing a study social networking site, in order to maintain subject contact and up-do-date locator information. This was evident in a study conducted in Canada, in which use of Internet-based searches to obtain telephone numbers at the time of study intake enhanced the researchers’ ability to locate participants who had subsequently moved and/or were using different names after 6 to 8 years .
Maintaining participant engagement, particularly when there may be long periods between assessment points, is essential to study retention and ensuring the validity of the results. Clinical populations, in particular, face significant barriers in terms of retention; frequent change in residency and generally high mobility make follow-up a challenge . The use of multiple methods for proactive retention not only prevents attrition but can actually improve follow-up rates . Communication technologies, in particular, are increasingly becoming important tools that researchers can use to interact with participants and promote study involvement.
According to a recent Pew Research Center poll , approximately 90 % of American adults have a cellphone and nearly two-thirds have a smartphone . Populations with traditionally very limited or no Internet access, such as lower socioeconomic and racial/ethnic minority groups, are able now to use their phone for connecting to online information . Thus, there is greater ability to engage and prompt large and diverse samples in order to improve study retention. Email invitations can serve as reminders for upcoming follow-up appointments as well as provide participants links to complete Internet-based follow-up assessments. In a qualitative study examining participant preferences in health services research, Hunter, Corcoran, Leeder, and Phelps  found that neither age nor gender affected participants’ preference for email invitations and web-based surveys. The authors, however, presented a wide range of responses regarding the point at which participants would feel “spammed” or simply ignore and delete email prompts; some stated every one to two weeks was acceptable while others felt monthly reminders would be excessive. Therefore, it may be helpful to note at intake participant concerns about spamming in order to reap the benefit of email reminders without over-prompting to annoyance.
Similar to email, the ubiquity of cellphones has made text messaging an easy and low-cost method for staying connected to participants in order to increase long-term follow-up rates . Several studies have now shown text messaging to be a useful method for assessment and intervention delivery (see Measuring Drug Use and Related Outcomes section); however, it also provides a simple way to send appointment reminders for telephone and face-to-face interviews. Additionally, text messaging is useful for sending thank-you notices for participation and acknowledging important dates, such as birthdays and milestones of study participation (e.g., one-year participation anniversary). Regular engagement with study staff has been shown to aid in retention [44, 50, 51] and personalized text-based interactions with staff may be valuable in increasing personal investment and identification with the project.
While phone numbers and email addresses are vulnerable to change, social media (e.g., Facebook, Twitter) usernames are generally stable. Facebook is becoming a more widely used tool for tracking and locating hard-to-find participants (see Locating section); however, gaining IRB approval for collecting social media contact information can be a cumbersome process [36, 38] . To maximize time allowed within the study to use Facebook (or other social media), as well as reduce staff time spent searching and confirming participant identities, it is recommended that researchers navigate and resolve IRB issues at the start of the study. Kim, Hickman, Gali, Orozco, and Prochaska  tracked substance use and mental health functioning in a high-risk, low-income population with serious mental illness at 3-, 6-, and 12-months post-baseline. They found that follow-up rates can actually increase over time when multiple strategies for maintaining contact are implemented. Similar findings were noted in a recent study examining recruitment and retention efforts with a veteran population with substance use disorders; the collection of social network usernames along with traditional contact information at baseline assisted in reducing loss to follow-up .
There is growing evidence supporting the ease and effectiveness of issuing subject payments electronically rather than by vouchers, money orders, or even cash. Some of the initial concerns surrounding debit-card payments for research participants have been addressed by vendors (e.g., Greenphire, CT Payer) specializing in issuing payments for clinical trial participants.1
The availability of electronic payment methods has expanded rapidly over the last 20 years, along with improvements in the ease of their use and security of payments. According to the Federal Reserve System , the number of payments (in the United States) issued by debit cards exceeded the number of credit card payments for the first time around 2004. Likewise, the number of prepaid card payments also increased—by more than 3 billion from 2009 to 2012. The use of mobile wallets also has increased sharply. This category refers to payments using the cell phone short message service (SMS), a mobile application, a virtual cloud based account, or near field radio-frequency identification (RFID) linked to a mobile device. In 2012, more than 250.6 million mobile payments were made using a mobile wallet application. In contrast, the number of checks paid has declined by half in the last decade alone.
The reason for the widespread adoption of this technology is clear: relative to the use of checks—or even cash in some contexts—debit cards offer a faster, simpler way of making financial transactions. Though virtually everyone can appreciate the immediacy of electronic payments relative to checks or money orders, there is evidence that increased payment efficiency holds disproportionate appeal to substance abusers, due to their truncated sense of time and tendency to discount the value of delayed rewards at a rate of 2 to 4 times that of non-substance abusers . Consequently, the value of immediate reinforcement appears to be especially acute for this population, underscoring the potential value of instantly creditable payment methods in longitudinal research with substance abusers.
Although the use of reloadable debit cards is slowly expanding in longitudinal substance use research, few researchers have published results from methodological studies comparing the effects of electronic payment methods on study engagement, follow-up rates, and staff time devoted to both paying and locating subjects over time. Our review of the literature revealed only one such study, which examined the use of debit cards as a means of enhancing follow-up rates in a longitudinal study of homeless drug users. In this study, De Jarlais, Perlis, and Settembrino  issued debit cards to a sample of 139 “urban nomads” and made deposits to their accounts each time they completed a telephone interview. The authors found that subjects with debit cards had substantially higher follow-up rates than similar subjects in two related studies that relied on traditional methods of issuing subject payments (81 % vs. 31 % and 67 %, respectively, at 6 months; 71 % vs. 10 % and 41 %, respectively, at 12 months).
In a more recent study, Farabee et al.  randomized 303 patients receiving SUD treatment into one of two incentivizing methods—money orders (MO) or a rechargeable incentive card (RIC). Participants were asked to call the researchers at the beginning of each calendar month for the ensuing 5 months in order to update their locator information—even if nothing had changed. Each call resulted in a $10 payment, issued immediately via the RIC system or by money order by mail. Research staff then located and interviewed all participants at Month 6. Contact logs assessed level of effort required to locate participants and conduct the follow-up interview. Relative to controls, RIC participants, especially those with low ability to defer gratification, initiated more monthly calls. Among outpatients, RIC participants made 39 % of the possible calls, whereas control subjects made 27 % (p < .01). Six-month follow-up rates (initiated by research staff) did not differ between RIC and control subjects (77 % overall). However, there were significant staff time savings in executing payments for those in the RIC condition.
With regard to ease of use, Farabee et al.  also assessed RIC users’ perception of reloadable debit cards and satisfaction with the process. They found that 98 % activated their cards. When asked if they had experienced any difficulties, 92 % reported that they had not, 6 % indicated that they had, and 2 % had not yet used their cards. When asked to compare the RIC method to other potential payment methods, RIC participants had a decided preference for the RIC method over grocery cards, money orders, and points redeemable for goods or services. Interestingly, there was even a slight, non-significant preference for the RIC method over cash payments.
Commercial vendors of rechargeable debit card payment methods for research participants (e.g., Greenphire, CT Payer) also provide user-friendly management information systems that simplify record-keeping and send automated reminders to both the researcher and participants of upcoming appointments. Moreover, these vendors are able to create limited-use bank accounts for individual study participants without having to access to the participants’ names or the nature of the study in which they are participating.
Measuring drug use and related outcomes
Technology has played a role in widening the assessment of substance use and related factors in naturally occurring environments using a variety of media applications, including telephones or web-based electronic systems. Ecological Momentary Assessment (EMA), also called experience sampling, is a common technology/electronic-based data capture method used in substance abuse research. Specifically, EMA can collect current or very recent states of behavioral, emotional, or cognitive metrics in real-world environments either using event-based, time-based, or randomly prompted measurement models . EMA data can be collected using random prompts, enabling assessment of the base rates of exposure to current or recent behavioral/emotional/cognitive states (i.e., craving/relapse triggers). In addition, EMA data can be captured using a participant-initiated approach, whereby participants are instructed to initiate an EMA entry immediately after a behavioral/emotional/cognitive state (i.e., after substance use, a craving, or a stressor occurred) [58, 59].
EMA data capture of behavioral, emotional, or cognitive indices has traditionally been collected using participant self-report; however, data capture has expanded to also include a combination of self-report with other sensory measurement (i.e., biological, physical, or auditory indices) programmed or linked to the electronic device. Specifically, self-reports entail participants completing ratings in response to prompts emitted by the device (with entries electronically time-stamped), whereas sensory data capture requires participants to use the electronic device to record pre-set sensory information (biological, auditory, or physical measures), such as heart-rate/pulse, voice, or environmental location-GPS, and number of steps/distance . Examples of EMA studies collecting retrospective self-report include Project CHESS (Comprehensive Health Enhancement Support System  and Project ESQYIR (Educating and Supporting Inquisitive Youth in Recovery) . In these studies, participants in recovery from substance use disorders received message prompts daily/weekly through a mobile phone platform (texting or mobile application) asking about substance use related behaviors, emotions, and cognitions. Other studies have focused on real-time self-initiated entries using random prompting. For example, Shiffman et al.  and Carter et al.  had participants carry PDA-based diaries on which they recorded their substance use behaviors when the PDAs “beeped” during different times of the day. Examples of EMA substance abuse studies using self-report in combination with sensory data collection include research by Mitchell et al.  and Epstein et al.  that used self-report EMA methods to examine real-time substance use behaviors, emotions (mood), cognitions (cravings), and sensory data (GPS location) to capture physical (neighborhood) metrics. The capture of both types of data occurred at randomly prompted times during waking hours.
A wide array of EMA methods have been used by researchers, providing a rich source of real-time, real-world observations. A common goal among the studies using EMA data collection methods is to obtain a complete or more holistic understanding of an individual’s recovery status (including an array of behavioral, emotional, cognitive, or environmental indicators, either via self-report or sensors) as he or she goes about daily life (during treatment or posttreatment). Much of the variability and creativity lies in how the researchers organize and analyze the EMA data to address unique research questions. Collectively, there are several benefits to using EMA methods. Data can be collected in greater frequency and in greater volumes within a short timespan, usually within 1–5 minutes. Self-reported data collection is flexible in terms of the metrics used (frequency, amount, ratings, or open-ended responses) . Utilizing data from built-in sensor methods is also advantageous, as it allows the investigator to have more information without adding a commensurate burden to researchers or participants. One limitation of self-reported substance use behaviors collected with EMA research is the limited access to biological urine sample data; hence, face-to-face data collection is also needed in EMA data capture studies. Gonzales et al.,  for example, used a combined EMA and in-person approach (i.e., EMA data capture occurred daily in combination with monthly face-to-face in-person assessments) to aid in corroborating self-reported results on drug use.
Response rates for substance abuse related studies utilizing EMA appear to be promising, but show considerable variation. For example, with tobacco users, response rates for reporting of cigarette use has ranged from 22 % , to 50 % [68, 69], to up to 90 % . Regarding compliance with adhering to the EMA data collection assessments, studies show that substance abusing populations are responsive, ranging from 75 to 98 % responded prompts [51, 58–60, 71, 72]. A complexity in EMA compliance is its variability. Litt et al. , for example, reported that individuals with alcohol use disorder discharged from a treatment program recorded much more drinking on EMA than on a later retrospective assessment, suggesting good compliance; however, they also found that individuals with alcohol use disorder only recorded a minority of their lapses and that they sometimes suspended recording for a few days after a lapse . Macedo, Maker, Latimer, and McAuley  recommend making follow-up phone calls in response to unanswered text prompts, which, in their study, boosted response rates from 54.8–74.2 % to 91.5–99 % over 12 months. Hence, good participant management procedures can yield high compliance.
Longitudinal research provides valuable information for understanding the initiation and course of substance use. Drug-using populations, however, can be particularly difficult to engage and retain in long-term studies [7, 18]. While there has long been evidence that increasing contact attempts boosts follow-up rates [14, 76], newer findings have shown that the utilization of multiple methods, including technology-based communication, to contact participants can significantly improve retention [45, 52]. As such, locator forms should collect social media contact information in addition to standard contact methods when possible and inform participants that study staff will be periodically contacting them via various methods between assessments for the purposes of keeping up-to-date contact information. Together, email, texting, social media, and electronic payment systems constitute a multi-pronged approach that can simultaneously reduce staff costs and improve follow-up rates in longitudinal SUD research.
EMA, Ecological Momentary Assessment; NIDA, National Institute on Drug Abuse; RFID, Near Field Radio-frequency Identification (RFID); RIC, rechargeable incentive card; SMS, short message service; SUD, substance use disorder
Few studies have reported results using other electronic payments such as Chase Quick Pay or Amazon e-gift cards, another potential quick electronic payment method.
This study was funded by the National Institute on Drug Abuse (NIDA; Center for Advancing Longitudinal Drug Abuse Research [CALDAR; P30-DA016383]). NIDA had no further role in study design; in the collection, analysis, and interpretation of data; in the writing of the report; or in the decision to submit the paper for publication. The contents are solely the responsibility of the authors and do not necessarily represent the views of NIDA.
This study was funded by the National Institute on Drug Abuse (NIDA; Center for Advancing Longitudinal Drug Abuse Research [CALDAR; P30-DA016383]). NIDA had no further role in study design; in the collection, analysis, and interpretation of data; in the writing of the report; or in the decision to submit the paper for publication. The contents are solely the responsibility of the authors and do not necessarily represent the views of NIDA.
Availability of data and materials
All authors contributed to the writing of this review. Primary content areas were as follows: DF (incentivizing), MS (prompting/engaging), RG (data collection), and CEG (tracking and locating). All authors read and approved the final manuscript.
The authors declare that they have no competing interests.
Consent for publication
Not applicable, as no data were collected.
Ethics approval and consent to participate
As this was a literature review, no human subjects oversight was required.
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- Pescosolido, BA, Martin JK, Long JS, Medina TR, Phelan JC, Link BG. “A disease like any other”? A decade of change in public reactions to schizophrenia, depression, and alcohol dependence. Am J Psychiatry. 2010;167(11).Google Scholar
- Hser YI, Evans E, Grella C, Ling W, Anglin D. Long-term course of opioid addiction. Harv Rev Psychiatry. 2015;23(2):76–89. doi:10.1097/hrp.0000000000000052.PubMedView ArticleGoogle Scholar
- Leshner AI. Addiction is a brain disease. Issues Sci Technol. 2001;17(3):75–80.Google Scholar
- Hansen W, Tobler NS, Graham JW. Attrition in substance abuse prevention research. Eval Rev. 1990;14(6):677–85.View ArticleGoogle Scholar
- Farabee D, Hawken A, Griffith P. Tracking and incentivizing substance abusers in longitudinal research: results of a survey of National Institute on Drug Abuse-funded investigators. J Addict Med. 2011;5(2):87–91. doi:10.1097/ADM.0b013e3181e11740.PubMedPubMed CentralView ArticleGoogle Scholar
- Substance Abuse and Mental Health Administration (SAMHSA). Government Performance and Results Act (GPRA) client outcome measures for discretionary programs. Washington: SAMSHA; 2013.Google Scholar
- Nemes S, Wish E, Wraight B, Messina N. Correlates of treatment follow-up difficulty. Subst Use Misuse. 2002;37(1):19–45.PubMedView ArticleGoogle Scholar
- Håkansson A, Widinghoff C, Abrahamsson T, Gedeon C. Correlates of nine-month retention following interim burprenorphine-naloxone treatment in opioid dependence: a pilot study. J Addict. 2016.Google Scholar
- Marel C, Mills K, Darke S, Ross J, Burns L, Teesson M. Can we predict retention in longitudinal studies of substance use? Findings from the Australian Treatment Outcome Study. Addict Behav. 2016;51:38–43.View ArticleGoogle Scholar
- Britton A, Ben-Shlomo Y, Benzeval M, Kuh D, Bell S. Life course trajectories of alcohol consumption in the United Kingdom using longitudinal data from nine cohort studies. BMC Med. 2015;13:47.PubMedPubMed CentralView ArticleGoogle Scholar
- Hansen WB, Collins LM, Malotte CK, Johnson CA, Fielding JE. Attrition in prevention research. J Behav Med. 1985;8:261–75.PubMedView ArticleGoogle Scholar
- Ribisl KM, Walton MA, Mowbray CT, Luke DA, Davidson WS, Bootsmiller BJ. Minimizing participant attrition in panel studies through the use of effective retention and tracking strategies: review and recommendations. Eval Program Plann. 1996;19:1–25.View ArticleGoogle Scholar
- Cohen EH, Mowbray CT, Bybee D, Yeich S, Ribisl K, Freddolino PP. Tracking and follow-up methods for research on homelessness. Eval Rev. 1993;17(3):331–52.View ArticleGoogle Scholar
- Cottler LB, Compton WM, Ben-Abdallah A, Horne M, Claverie D. Achieving a 96.6 percent follow-up rate in a longitudinal study of drug abusers. Drug Alcohol Depend. 1996;41(3):209–17.PubMedView ArticleGoogle Scholar
- Desmond DP, Maddux JF, Johnson TH, Confer BA. Obtaining follow-up interviews for treatment evaluation. J Subst Abuse Treat. 1995;12(2):95–102.PubMedView ArticleGoogle Scholar
- Hunt JR, White E. Retaining and tracking cohort study members. Epidemiol Rev. 1998;20(1):57–70.PubMedView ArticleGoogle Scholar
- Ziek K, Tiburcio N, Correa N. Follow-up and tracking methods for hard to reach populations. In: Tortu S, Goldsamt L, Hamid R, editors. A practical guide to research and service with hidden populations. Boston: Allyn and Bacon; 2002.Google Scholar
- Scott CK. A replicable model for achieving over 90 % follow-up rates in longitudinal studies of substance abusers. Drug Alcohol Depend. 2004;74(1):21–36. doi:10.1016/j.drugalcdep.2003.11.007.PubMedView ArticleGoogle Scholar
- Williams B, Irvine L, McGinnis AR, McMurdo ME, Crombie IK. When “no” might quite mean “no”; the importance of informed and meaningful non-consent: results from a survey of individuals refusing participation in a health-related research project. BMC Health Serv Res. 2007;7:59.PubMedPubMed CentralView ArticleGoogle Scholar
- Evans E, Murphy DA, Grella CE, Mouttapa M, Hser YI. Regulatory issues encountered when conducting longitudinal substance abuse research. J Drug Issues. 2008;38(4):1003–26.PubMedPubMed CentralView ArticleGoogle Scholar
- Scott CK, Sonis J, Creamer M, Dennis ML. Maximizing follow-up in longitudinal studies of traumatized populations. J Trauma Stress. 2006;19(6):757–69. doi:10.1002/jts.20186.PubMedView ArticleGoogle Scholar
- Allott K, Chanen A, Yuen HP. Attrition bias in longitudinal research involving adolescent psychiatric outpatients. J Nerv Ment Dis. 2006;194(12):958–61. doi:10.1097/01.nmd.0000243761.52104.91.PubMedView ArticleGoogle Scholar
- Claus RE, Kindleberger LR, Dugan MC. Predictors of attrition in a longitudinal study of substance abusers. J Psychoactive Drugs. 2002;34(1):69–74. doi:10.1080/02791072.2002.10399938.PubMedView ArticleGoogle Scholar
- Jacomb PA, Jorm AF, Korten AE, Christensen H, Henderson AS. Predictors of refusal to participate: a longitudinal health survey of the elderly in Australia. BMC Public Health. 2002;2:4.PubMedPubMed CentralView ArticleGoogle Scholar
- Patton R, Slesnick N, Bantchevska D, Guo X, Kim Y. Predictors of follow-up completion among runaway substance-abusing adolescents and their primary caretakers. Community Ment Health J. 2011;47(2):220–6. doi:10.1007/s10597-009-9281-9.PubMedView ArticleGoogle Scholar
- Kurlander JE, Simon-Dack SL, Gorelick DA. Spending of remuneration by subjects in non-treatment drug abuse research studies. Am J Drug Alcohol Abuse. 2006;32(4):527–40. doi:10.1080/00952990600919427.PubMedView ArticleGoogle Scholar
- Bale RN, Arnoldussen BH, Quittner AM. Follow-up difficulty with substance abusers: predictors of time to locate and relationship to outcome. Int J Addict. 1984;19(8):885–902.PubMedView ArticleGoogle Scholar
- Cunningham R, Walton MA, Tripathi SP, Outman R, Murray R, Booth BM. Tracking inner city substance users from the emergency department: how many contacts does it take? Acad Emerg Med. 2008;15(2):136–43. doi:10.1111/j.1553-2712.2008.00033.x.PubMedPubMed CentralView ArticleGoogle Scholar
- Digiusto E, Panjari M, Gibson A, Rea F. Follow-up difficulty: correlates and relationship with outcome in heroin dependence treatment in the NEPOD study. Addict Behav. 2006;31(7):1201–10. doi:10.1016/j.addbeh.2005.09.004.PubMedView ArticleGoogle Scholar
- Hansten ML, Downey L, Rosengren DB, Donovan DM. Relationship between follow-up rates and treatment outcomes in substance abuse research: more is better but when is “enough” enough? Addiction. 2000;95(9):1403–16.PubMedView ArticleGoogle Scholar
- Kleschinsky JH, Bosworth LB, Nelson SE, Walsh EK, Shaffer HJ. Persistence pays off: follow-up methods for difficult-to-track longitudinal samples. J Stud Alcohol Drugs. 2009;70(5):751–61.PubMedPubMed CentralView ArticleGoogle Scholar
- Meyers K, Webb A, Frantz J, Randall M. What does it take to retain substance-abusing adolescents in research protocols? Delineation of effort required, strategies undertaken, costs incurred, and 6-month post-treatment differences by retention difficulty. Drug Alcohol Depend. 2003;69(1):73–85.PubMedView ArticleGoogle Scholar
- Graziotti AL, Hammond J, Messinger DS, Bann CM, Miller-Loncar C, Twomey JE, et al. Maintaining participation and momentum in longitudinal research involving high-risk families. J Nurs Scholarsh. 2012;44(2):120–6. doi:10.1111/j.1547-5069.2012.01439.x.PubMedPubMed CentralView ArticleGoogle Scholar
- Raento M, Oulasvirta A, Eagle N. Smartphones: an emerging tool for social scientists. Socio Methods Res. 2009;37(3):426–54.View ArticleGoogle Scholar
- Scott CK, Johnson K, Dennis ML. Using mobile phone technology to provide recovery support for women offenders. Telemed J E Health. 2013;19(10):767–71. doi:10.1089/tmj.2012.0309.PubMedPubMed CentralView ArticleGoogle Scholar
- Mitchell SG, Schwartz RP, Alvanzo AA, Weisman MS, Kyle TL, Turrigiano EM, et al. The use of technology in participant tracking and study retention: Lessons learned from a Clinical Trials Network Study. Subst Abuse. 2015: doi:10.1080/08897077.2014.992565.
- Marsh J, Bishop JC. Challenges in the use of social networking sites to trace potential research participants. Int J Res Method Educ. 2014;37(2):113–24.View ArticleGoogle Scholar
- Bolanos F, Herbeck D, Christou D, Lovinger K, Pham A, Raihan A, et al. Using Facebook to maximize follow-up response rates in a longitudinal study of adults who use methamphetamine. Subst Abuse. 2012;6:1–11. doi:10.4137/sart.s8485.PubMedPubMed CentralGoogle Scholar
- Masson H, Balfe M, Hackett S, Phillips J. Lost without a trace? Social networking and social research with a hard-to-reach population. Br J Soc Work. 2013;43:24–40.View ArticleGoogle Scholar
- Mychasiuk R, Benzies K. Facebook: an effective tool for participant retention in longitudinal research. Child Care Health Dev. 2012;38(5):753–6. doi:10.1111/j.1365-2214.2011.01326.x.PubMedView ArticleGoogle Scholar
- Corsi KF, Hunnik BV, Kwiatkowski CF, Booth RR. Computerized tracking and follow-up techniques in longitudinal research with drug users. Health Serv Outcome Res Methodol. 2006;6:101–10.View ArticleGoogle Scholar
- Williams IL, O’Donnell CR. Web-based tracking methods in longitudinal studies. Eval Program Plann. 2014;45:82–9.PubMedView ArticleGoogle Scholar
- Cadarette SM, Dickson L, Gignac MA, Beaton DE, Jaglal SB, Hawker GA. Predictors of locating women six to eight years after contact: internet resources at recruitment may help to improve response rates in longitudinal research. BMC Med Res Methodol. 2007;7:22. doi:10.1186/1471-2288-7-22.PubMedPubMed CentralView ArticleGoogle Scholar
- Nicholson LM, Schwirian PM, Klein EG, Skybo T, Murray-Johnson L, Eneli I, et al. Recruitment and retention strategies in longitudinal clinical studies with low-income populations. Contemp Clin Trials. 2011;32(3):353–62. doi:10.1016/j.cct.2011.01.007.PubMedPubMed CentralView ArticleGoogle Scholar
- Kim R, Hickman N, Gali K, Orozco N, Prochaska JJ. Maximizing retention with high risk participants in a clinical trial. Am J Health Promot. 2014;28(4):268–74. doi:10.4278/ajhp.120720-QUAN-355.PubMedView ArticleGoogle Scholar
- Pew Research Center. Internet project survey, January 9–12. 2014. http://www.pewresearch.org/. Accessed 25 Mar 2015.
- Pew Research Center. American panel trends survey, October 3–27. 2014. http://www.pewresearch.org/. Accessed 25 March 2015.
- Hunter J, Corcoran K, Leeder S, Phelps K. Is it time to abandon paper? The use of emails and the Internet for health services research--a cost-effectiveness and qualitative study. J Eval Clin Pract. 2013;19(5):855–61. doi:10.1111/j.1365-2753.2012.01864.x.PubMedGoogle Scholar
- Torres LN, Turok DK, Sanders JN, Jacobson JC, Dermish AI, Ward K. We should really keep in touch: predictors of the ability to maintain contact with contraception clinical trial participants over 12 months. Contraception. 2014;90(6):575–80. doi:10.1016/j.contraception.2014.07.013.PubMedPubMed CentralView ArticleGoogle Scholar
- Wallace NM, Berent JM, McCarthy TG, Senn TE, Carey MP. Recruitment and retention of low-income, urban participants in longitudinal study: recognizing and strengthening participants’ motivations. Behav Ther. 2014;37(8):226–30.Google Scholar
- Yancey AK, Ortega AN, Kumanyika SK. Effective recruitment and retention of minority research participants. Annu Rev Public Health. 2006;27:1–28. doi:10.1146/annurev.publhealth.27.021405.102113.PubMedView ArticleGoogle Scholar
- Michalek AK, Kan D, Prochaska J. Engaging veterans with substance abuse disorders into a research trial: success with study branding, networking, and presence. Transl Behav Med. 2015. doi:10.1007/s13142-014-0302-z.
- Federal Reserve System. The 2013 Federal Reserve payments study: recent and long-term trends in the United States: 2003–2013. 2014. https://www.frbservices.org/files/communications/pdf/general/2013_fed_res_paymt_study_detailed_rpt.pdf. Accessed 29 May 2015.Google Scholar
- Petry NM, Casarella T. Excessive discounting of delayed rewards in substance abusers with gambling problems. Drug Alcohol Depend. 1999;56(1):25–32.PubMedView ArticleGoogle Scholar
- Des Jarlais DC, Perlis TE, Settembrino JM. The use of electronic debit cards in longitudinal data collection with geographically mobile drug users. Drug Alcohol Depend. 2005;77(1):1–5. doi:10.1016/j.drugalcdep.2004.06.010.PubMedView ArticleGoogle Scholar
- Farabee D, Hawken A, Calhoun S, Veliz R, Grossman J, Zhang, Y. Tracking and locating itinerant subjects with rechargeable incentive cards: results of a randomized trial. Health Serv Outcomes Res Methodol. in press.Google Scholar
- Stone AA, Shiffman S. Ecological momentary assessment in behavioral medicine. Ann Behav Med. 1994;16:199–202.Google Scholar
- Ben-Zeev D, McHugo GJ, Xie H, Dobbins K, Young MA. Comparing retrospective reports to real-time/real-place mobile assessments in individuals with schizophrenia and a nonclinical comparison group. Schizophr Bull. 2012;38(3):396–404. doi:10.1093/schbul/sbr171.PubMedPubMed CentralView ArticleGoogle Scholar
- Gaggioli A, Pioggia G, Tartarisco G, Baldus G, Corda D, Cipresso P, et al. A mobile data collection platform for mental health research. Pers Ubiquit Comput. 2013;17(2):241–51. doi:10.1007/s00779-011-0465-2.View ArticleGoogle Scholar
- Ebner-Priemer UW, Eid M, Kleindienst N, Stabenow S, Trull TJ. Analytic strategies for understanding affective (in)stability and other dynamic processes in psychopathology. J Abnorm Psychol. 2009;118(1):195–202.PubMedView ArticleGoogle Scholar
- Chih MY, Patton T, McTavish FM, Isham AJ, Judkins-Fisher CL, Atwood AK, et al. Predictive modeling of addiction lapses in a mobile health application. J Subst Abuse Treat. 2014;46(1):29–35. doi:10.1016/j.jsat.2013.08.004.PubMedView ArticleGoogle Scholar
- Gonzales R, Ang A, Murphy D, Glik DC, Anglin MD. Substance use recovery outcomes among a cohort of youth participating in a mobile-based texting aftercare program. J Subst Abuse Treat. 2014;47(1):20–6.PubMedPubMed CentralView ArticleGoogle Scholar
- Shiffman S, Gwaltney CJ, Balabanis MH, Liu KS, Paty JA, Kassel JD, Hickcox M, Gnys M. Immediate antecedents of cigarette smoking: an analysis from ecological momentary assessment. J Abnorm Psychol. 2002;111(4):531–45.PubMedView ArticleGoogle Scholar
- Carter BL, Lam CY, Robinson JD, Paris MM, Waters AJ, Wetter DW, Cinciripini PM. Real-time craving and mood assessments before and after smoking. Nicotine Tob Res. 2008;10(7):1165–9.PubMedPubMed CentralView ArticleGoogle Scholar
- Mitchell JT, Schick RS, Hallyburton M, Dennis MF, Kollins SH, Beckham JC, et al. Combined ecological momentary assessment and global positioning system tracking to assess smoking behavior: A proof of concept study. J Dual Diagn. 2014;10(1):19–29.PubMedPubMed CentralView ArticleGoogle Scholar
- Epstein DH, Tyburski M, Craig IM, Phillips KA, Jobes ML, Vahabzadeh M, et al. Real-time tracking of neighborhood surroundings and mood in urban drug misusers: application of a new method to study behavior in its geographical context. Drug Alcohol Depend. 2014;134:22–9. doi:10.1016/j.drugalcdep.2013.09.007.PubMedView ArticleGoogle Scholar
- Rowan PJ, Cofta-Woerpel L, Mazas CA, Vidrine JI, Reitzel LR, Cinciripini PM, et al. Evaluating reactivity to ecological momentary assessment during smoking cessation. Exp Clin Psychopharmacol. 2007;15(4):382–9.PubMedView ArticleGoogle Scholar
- Delfino RJ, Jamner LD, Whalen CK. Temporal analysis of the relationship of smoking behavior and urges to mood states in men versus women. Nicotine Tob Res. 2001;3(3):235–48.PubMedView ArticleGoogle Scholar
- Shapiro D, Jamner LD, Davtdov DM, James W. Situations and moods associated with smoking in everyday life. Psychol Addict Behav. 2002;16(4):342–5.PubMedView ArticleGoogle Scholar
- Shiffman S, Dunbar MS, Li X, Scholl SM, Tingle HA, Anderson SJ, Ferguson SG. Smoking patterns and stimulus control in intermittent and daily smokers. PLoS One. 2014;9(3):e89911.PubMedPubMed CentralView ArticleGoogle Scholar
- Suffoletto B, Callaway C, Kristan J, Clark DB. Text message based drinking assessments and brief interventions for young adults discharged from the emergency department. Alcohol Clin Exp Res. 2012;36(3):552–60.PubMedView ArticleGoogle Scholar
- Courvoisier DS, Eid M, Lischetzke T. Compliance to a cell phone-based ecological momentary assessment study: the effect of time and personality characteristics. Psychol Assess. 2012;24(3):713–20. doi:10.1037/a0026733.PubMedView ArticleGoogle Scholar
- Litt MD, Cooney NL, Morse P. Reactivity to alcohol-related stimuli in the laboratory and in the field: predictors of craving in treated alcoholics. Addiction. 2000;95(6):889–900.PubMedView ArticleGoogle Scholar
- Litt MD, Cooney NL, Morse P. Ecological momentary assessment (EMA) with treated alcoholics: methodological problems and potential solutions. Health Psychol. 1998;17(1):48–52.PubMedView ArticleGoogle Scholar
- Macedo LG, Maher CG, Latimer J, McAuley JH. Feasibility of using short message service to collect pain outcomes in a low back pain clinical trial. Spine (Phila Pa 1976). 2012;37(13):1151–5. doi:10.1097/BRS.0b013e3182422df0.View ArticleGoogle Scholar
- Stouthamer-Loeber M, van Kammen W, Loeber R. The nuts and bolts of implementing large-scale longitudinal studies. Violence Vict. 1992;7(1):63–78.PubMedGoogle Scholar