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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