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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