Skip to main content

Table 4 Sample size and power calculations for primary and secondary outcome

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

  Laboratory confirmed influenza Laboratory confirmed respiratory illness
Annual attack rate, Medical Mask group 0.12 0.25
Cumulative 4-year attack rate, Medical Mask group 0.39 0.68
Detectable relative risk 0.75 0.75
Median cluster size 16 16
ICC 0.1 0.1
Total person-seasons of observation 10,024 5104