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Table 2 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 assuming no clustering (ie ICC = 0.00)

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]

Total number of babies needed
p 1 P 2
  30 35 40 45 50 55 60 65 70 75 80 85 90  
60          712 304 162 98 62  
55         752 324 176 108 70 48  
50        774 338 186 116 76 54 38  
45       782 346 192 120 82 58 42 32  
40      774 346 194 122 84 60 44    
35     752 388 192 122 84 62      
30    712 324 186 120 84        
25   656 304 176 116          
20 546 276 162