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Table 5 Power analysis of the sensitivity to the 4-year attack rate

From: The Respiratory Protection Effectiveness Clinical Trial (ResPECT): a cluster-randomized comparison of respirator and medical mask effectiveness against respiratory infections in healthcare personnel

  Low attack rate scenario High attack rate scenario
Outcome Medical mask attack rate Power (RR = 0.75) Detectable RR (80 % Power) Medical mask attack rate Power (RR = 0.75) Detectable RR (80 % Power)
Primary 0.2 43 % 0.62 0.5 93 % 0.80
Influenza like illness 0.15 33 % 0.56 0.4 82 % 0.76
Acute respiratory illness 0.5 93 % 0.80 0.95 100 % 0.94
Laboratory confirmed respiratory illness 0.3 91 % 0.79 0.7 100 % 0.90