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Table 3 Intention-to-treat analysis of changes in test ordering rates

From: Effect of audit and feedback with peer review on general practitioners’ prescribing and test ordering performance: a cluster-randomized controlled trial

  Intervention Control  
Clinical topic n Mean before (sd) Mean after (sd) n Mean before (sd) Mean after (sd) Ba (95% CI) icc Direction p
Anaemia 39 177.8 (173.1) 208.4 (216.9) 49 208.1 (148.7) 247.3 (176.7) 15.3 (−53.7, 83.3) 0.31 0.630
Rheumatic complaints 39 12.9 (20.1) 13.1 (23.0) 49 12.9 (16.2) 15.0 (27.5) 2.9 (−9.0, 14.9) 0.31 0.581b
Prostate complaints 39 34.4 (28.0) 36.1 (26.2) 49 37.6 (27.9) 40.7 (31.0) 1.8 (−4.9, 8.6) 0.04 0.575
Chlamydia infections 49 9.9 (15.4) 8.9 (19.5) 39 7.8 (9.6) 6.3 (10.0) 2.2 (−9.5, 13.9) 0.74 0.701
Thyroid dysfunction 49 178.9 (139.0) 206.1 (155.4) 39 160.6 (158.3) 186.1 (151.7) 3.9 (−26.3, 34.11) 0.03 0.788
Perimenopausal complaints 49 5.6 (6.2) 5.2 (6.0) 39 6.4 (7.6) 7.4 (8.5) −1.4 (−5.0, 2.1) 0.29 0.404
  1. The desired direction of change is given in the column headed ‘Direction’. Numbers represent the number of tests prescribed per 6 months per 1000 patients
  2. n = number of practices
  3. aAdjusted difference between groups at end of intervention, corrected for baseline
  4. bStatistically significant interaction
  5. Rheumatic complaints
  6. P 10: B (95% CI):−7.8 (−22.0, 6.5). p: 0.257
  7. P 90: B (95% CI): 16.3 (1.7, 30.9). p: 0.031