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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