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Table 4 ROAR power analysis

From: Reducing overdose after release from incarceration (ROAR): study protocol for an intervention to reduce risk of fatal and non-fatal opioid overdose among women after release from prison

Minimal detectable differences of post-release opioid overdose as absolute difference and relative risk
  Baseline rate 20% Baseline rate 25%
ρ Raw risk difference Relative risk difference Raw risk difference Relative risk difference
0.0000 0.105 0.48 0.12 0.52
0.0050 0.115 0.43 0.125 0.50
0.0075 0.120 0.40 0.13 0.48
0.0100 0.120 0.40 0.135 0.46
  1. Calculations assume equivalent sample size of 100 participants for each control and intervention groups, a minimum of 80% power, and alpha level of 5%