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Table 3 Power Calculation for Survival Analyses*

From: The rationale and design of Insight into Nephrotic Syndrome: Investigating Genes, Health and Therapeutics (INSIGHT): a prospective cohort study of childhood nephrotic syndrome

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