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Table 1 Randomised comparison between intervention and control practices. Number of HIV tests, annual rate of HIV testing per 1000 patients, and difference in rate by practice and randomisation arm and overall, and number of positive tests. Data for 6 months pre and post intervention for intervention practices, and for corresponding time periods (both pre-intervention) for the control practices

From: Evaluation of an educational intervention to increase HIV-testing in high HIV prevalence general practices: a pilot feasibility stepped-wedged randomised controlled trial

   Randomised comparison
Total population No. of HIV tests Annual rate of HIV tests per 1000 patients
   Pre Post Pre Post Difference
Intervention practices   −6,-1 1,6 −6,-1 1,6 post-pre
 1 5547 99 90 35.7 32.4 −3.2 (−13.0, 6.5)
 2 6295 112 122 35.6 38.8 3.2 (−6.3, 12.7)
 3 12,794 103 105 16.1 16.4 0.3 (−4.1, 4.7)
 4 8506 52 44 12.2 10.3 −1.9 (−6.4, 2.6)
 5 7206 40 47 11.1 13.0 1.9 (−3.1, 7.0)
 6 7203 48 57 13.3 15.8 2.5 (−3.1, 8.1)
 7 6304 60 67 19.0 21.3 2.2 (−4.8, 9.2)
 8 5496 15 21 5.5 7.6 2.2 (−2.1, 6.5)
 9 6710 45 78 13.4 23.2 9.8 (3.4, 16.3)
Mean difference n = 9       1.9 (−0.5, 4.3)
TOTAL intervention 66,061 574 631 17.4 19.1 1.7 (− 0.3, 3.8)
Positive tests   3 3    
   Pre 1 Pre 2 Pre 1 Pre 2 Difference
Control practices   −12,-7 −6, −1 −12,-7 −6, −1 Pre2-Pre1
 10 9081 36 36 7.9 7.9 0.0 (−3.7, 3.7)
 11 4133 16 22 7.7 10.6 2.9 (−2.9, 8.8)
 12 10,833 63 76 11.6 14.0 2.4 (−1.9, 6.7)
 13 14,547 149 159 20.5 21.9 1.4 (−3.4, 6.1)
 14 2878 38 41 26.4 28.5 2.1 (−10.0, 14.2)
 15 4711 18 27 7.6 11.5 3.8 (−1.8, 9.4)
 16 12,456 108 115 17.3 18.5 1.1 (−3.6, 5.8)
 17 6945 92 132 26.5 38.0 11.5 (3.1, 20.0)
 18 3334 16 18 9.6 10.8 1.2 (−5.7, 8.1)
 19 6960 44 42 12.6 12.1 −0.6 (−5.8, 4.6)
Mean difference n = 10       2.6 (0.5, 4.7)
TOTAL control 75,878 580 668 15.3 17.6 2.3 (0.5, 4.1)
Positive tests   7 2    
All practices       
Mean difference n = 19       2.3(0.7, 3.8)
TOTAL all (pooled) 141,939 1154 1299 16.3 18.3 2.0 (0.7, 3.4)
TOTAL positive tests   10 5