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Table 6 Linear mixed model analyses (TTR calculation based on GP-based target ranges)a – practice-level covariates

From: Differences in the quality of oral anticoagulation therapy with vitamin K antagonists in German GP practices – results of the cluster-randomized PICANT trial (Primary Care Management for Optimized Antithrombotic Treatment)

Variables Regression coefficient 95% confidence interval P valueb R 2
Male gender −3.51 −7.54; 0.52 0.086 0.09
Age of GP, years 0.07 − 0.20; 0.34 0.621 0.09
Job experience since medical school, years 0.08 −0.18; 0.33 0.551 0.09
Practice type
 Single-handed practice Reference
 Shared or group practice −1.08 −5.06; 2.90 0.588 0.09
Panel size, registered patients per quarter, no. (%)c 0.598 0.10
 500–999 Reference
 1009–1499 −2.72 −8.87; 3.43   
 1500–1999 −4.83 −11.37; 1.71   
  > 2000 − 4.19 −11.13; 2.76   
Main focus of the practiced
 Cardiology −0.41 −4.36; 3.54 0.836 0.09
 Diabetology −0.06 −4.01; 3.89 0.977 0.09
 Geriatrics −0.33 −4.61; 3.95 0.878 0.09
 Natural medicine −4.26 −9.93; 1.40 0.137 0.09
Third-party certification in quality management for medical practices (e.g. QEP)e −5.74 −9.47; − 2.01 0.003 0.10
Knowledge test on OAC for GPs, pointsf 0.00 −1.27; 1.28 0.996 0.09
Location of the practice
 Rural (<  20.000 inhabitants) Reference
 Provincial (20.000–100.000 inhabitants) −4.14 −8.55; 0.27 0.266 0.10
 Urban (>  100.000 inhabitants) −0.97 −5.96; 4.02   
  1. aThese analyses are based on n = 688 patients and the models are adjusted for randomization group
  2. bp values marked in bold are statistically significant at a significance level of 0.05
  3. cIn Germany, panel size is calculated as the number of patient registrations in a practice over a 3-month period
  4. dPractices may have had more than one focus
  5. eThe quality management system QEP (Qualität und Entwicklung in Praxen® [Quality and Development in practices]) was developed by the National Association of Statutory Health Insurance Physicians and regional Associations of Statutory Health Insurance Physicians
  6. fSelf-developed knowledge questionnaire (sum score 0–12) with higher scores indicating greater knowledge about OAC