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Volume 28, Number 1—January 2022

Mask Effectiveness for Preventing Secondary Cases of COVID-19, Johnson County, Iowa, USA

Jacob RileyComments to Author , Jamie M. Huntley, Jennifer A. Miller, Amelia L.B. Slaichert, and Grant D. Brown
Author affiliations: Johnson County Public Health, Iowa City, Iowa, USA (J. Riley, J.M. Huntley, J.A. Miller, A.L.B. Slaichert); University of Iowa, Iowa City, Iowa, USA (G.D. Brown)

Main Article

Table 3

Multiple logistic regression for study of mask effectiveness for preventing secondary cases of coronavirus disease, Johnson County, Iowa, USA

Parameter Estimate Odds ratio (95% CI) p value
Intercept −1.67 0.19 (0.11–0.32) <0.001
Mask score −0.36 0.70 (0.57–0.84) <0.001
Exposure: indoors −0.37 0.69 (0.48–1.01) 0.052
Case-patient symptomatic 0.25 1.28 (0.93–1.78) 0.131
Exposure >2 h 0.65 1.92 (1.35–2.76) <0.001
Age, 0-y increase 0.13 1.13 (1.04–1.23) 0.003

Main Article

Page created: October 12, 2021
Page updated: October 12, 2021
Page reviewed: October 12, 2021
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