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Table 1 Power calculation for policies assessment

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]

% with policy in control arm (p1) % with policy in intervention arm (p2) Size of effect (RR) Total number of hospitals needed to detect with 80% power at 5% level of statistical significance (two-sided test)
60 82 1.4 126
55 78 1.4 124
50 74 1.5 121
45 69 1.5 126
40 64 1.6 128
35 59 1.6 128