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Table 4 Linear mixed model analyses (TTR calculated according to standard 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 of GP −4.07 −7.97; −0.18 0.041 0.08
Age of GP, years 0.05 −0.21; 0.32 0.687 0.09
Job experience since medical school, years 0.06 −0.19; 0.31 0.609 0.09
Practice type
 Single-handed practice Reference
 Shared or group practice −0.66 −4.56; 3.25 0.737 0.09
Panel size, registered patients per quarter, no. (%)c 0.784 0.09
 500–999 Reference
 1000–1499 −1.03 −7.12; 5.06   
 1500–1999 −3.34 −9.81; 3.14   
  > 2000 −2.37 −9.24; 4.51   
Main focus of the practiced
 Cardiology −0.79 −4.65; 3.08 0.684 0.09
 Diabetology −0.43 −4.30; 3.44 0.824 0.09
 Geriatrics −1.13 −5.31; 3.05 0.590 0.09
 Natural medicine −4.02 −9.58; 1.54 0.153 0.09
Third-party certification in quality management for medical practices (e.g. QEP)e −5.12 −8.79; − 1.46 0.007 0.09
Knowledge test on OAC for GPs, pointsf −0.05 −1.30; 1.20 0.933 0.09
Location of the practice
 Rural (<  20,000 inhabitants) Reference
 Provincial (20,000–100,000 inhabitants) −3.82 −8.15; 0.52 0.290 0.09
 Urban (>  100,000 inhabitants) −0.58 −5.48; 4.31   
  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