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Table 5 Per-protocol analysis of change in test ordering rates for each topic

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 35 176.8 (172.2) 209.4 (174.6) 53 199.6 (146.3) 232.5 (177.7) −9.1 (−96.1, 77.9) 0.60 ↓ 0.829
Rheumatic complaints 39 13.3 (22.9) 11.6 (20.7) 49 12.9 (16.2) 14.9 (27.5) 3.2 (−8.1, 14.6) 0.55 ↓ 0.551b
Prostate complaints 26 34.7 (24.6) 30.4 (29.3) 62 39.1 (27.4) 41.8 (29.5) 6.9 (−0.7, 14.6) 0.07 ↓ 0.072
Chlamydia infections 30 11.4 (21.5) 14.7 (23.3) 58 7.4 (8.8) 5.8 (9.5) −5.7 (−12.0, 0.5) 0.40 ↑ 0.069b
Thyroid dysfunction 29 204.8 (159.9) 191.3 (135.4) 59 163.3 (153.2) 191.7 (152.8) 36.6 (10.5, 62.7) 0.00 ↓ 0.007
Perimenopausal complaints 24 5.7 (5.5) 3.8 (3.5) 64 6.1 (6.7) 7.3 (8.0) 3.2 (0.1, 6.4) 0.10 ↓ 0.046b
  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. P10: B (95% CI):−3.0 (−13.9, 8.0). p: 0.560
  7. P90: B (95% CI): 14.8 (2.1, 27.4). p: 0.025
  8. Chlamydia infections
  9. P10: B (95% CI):−2.3 (−9.0, 4.4) p: 0.482
  10. P90: B (95% CI):−10.4 (−17.6,−3.3) p: 0.006
  11. Perimenopausal complaints
  12. P10: B (95% CI): 0.7 (−3.0, 4.5). p: 0.696
  13. P90: B (95% CI): 6.6 (2.4, 10.7). p: 0.002
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