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Table 3 Power calculation for changes in practice for various assumptions of % with practice pre-intervention – p1 (20–60%), p2 (30–90%), assuming 80% power at 5% level of statistical significance (2-sided test), for sizes of effect ≤ 2 and for cluster size three (numbers of babies admitted per hospital)

From: The BLISS cluster randomised controlled trial of the effect of 'active dissemination of information' on standards of care for premature babies in England (BEADI) study protocol [ISRCTN89683698]

ICC assumption required for 390 babies
p 1 P 2
  30 35 40 45 50 55 60 65 70 75 80 85 90  
60           0.14     
55          0.01 0.6     
50         0.07 0.54      
45        0.06 0.5       
40       0.06 0.5        
35      0.07 0.5         
30     0.1 0.54          
25    0.14 0.6           
20   0.2