Table 3

Power Calculation for Survival Analyses*
Proposed study population
350 400
% exposed 10% 20% 30% 40% 10% 20% 30% 40%
Hazard ratio 1.5 0.31 0.59 0.74 0.8 0.37 0.66 0.8 0.85
2 0.79 0.98 0.99 0.99 0.86 0.99 0.99 0.99
2.5 0.98 0.99 0.99 1 0.99 0.99 1 1

*assuming an alpha of 0.05, follow-up over 3 years, and a 10% drop out in either group.

Hussain et al.

Hussain et al. BMC Nephrology 2013 14:25   doi:10.1186/1471-2369-14-25

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