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Table 1 Comparing routine data for ‘respondents’ and ‘non-repondents’ to the SSSP survey

From: Provision of smoking cessation support for pregnant women in England: results from an online survey of NHS stop smoking services for pregnant women

Variables Completed survey (n = 121) Did not complete survey (n = 20) Comparison test Test
     p-value
Number set quit date 127 (80–211) 63.5 (48–92) WMW <0.01
[median (IQR)]
Number SR four-week quitters 58 (34–82) 27.8 (16–45) WMW <0.01
[median (IQR)]
Quit rate* 45.5 ± 11.5 43.0 ± 10.5 t-test 0.35
[Mean ± S.D.]
SSSP area-level IMD score 22.7 ± 8.0 25.9 ± 8.3 t-test 0.11
[Mean ± S.D.]
SaToD 14.7 ± 5.7 11.9 ± 6.6 t-test 0.05
[Mean ± S.D.]     
  1. IQR, Interquartile Range; S.D., Standard Deviation; WMW, Wilcoxon-Mann–Whitney test; SSSP, Stop Smoking Service for Pregnant women; SR, Self-Reported; IMD, index of multiple deprivation; SaToD, smoking at time of delivery.
  2. Of the 121 services that completed the survey, number set quit date and number four week quitters was available for 119 services and quit rate, IMD, and SaToD was available for 120 services.
  3. Wilcoxon-Mann–Whitney Test used to assess potential differences in the underlying distribution of non-normally distributed variables for responding services compared to non-responding services. Two sample t-test used to assess potential differences in the mean of normally distributed variables for responding services compared to non-responding services.
  4. *self-reported quit rate calculated as proportion of pregnant women who set a quit date that remain quit at four weeks.