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Volume 28, Number 1—January 2022
Mask Effectiveness for Preventing Secondary Cases of COVID-19, Johnson County, Iowa, USA
|Parameter||Estimate||Odds ratio (95% CI)||p value|
|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|
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