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. 2022 May 20;149(6):e2022056687. doi: 10.1542/peds.2022-056687

TABLE 3.

Quasi-Poisson Regression of Predicted Secondary Cases and Relative Rate of Secondary Transmission by Masking Policy, Adjusted Per Capita and by Weeks Reporting to Study

Masking Policy Districts, n (%) Students and Staff, n Mean Primary Infections per 1000 Students and Staff per Week, n Mean Secondary Infections per 1000 Students and Staff per Week, n Predicted Secondary Cases per 100 Primary Cases 95% CI Relative Rate of Secondary Transmission 95% CI
Universal 46 1  227 131 2.7 0.16 5.8 3.62–9.27
Partiala 9 38 261 4.3 0.52 12.0 6.64–21.53 2.1 0.97–4.38
Optional 6 4576 5.4 2.33 43.5 30.99–61.10 7.5 4.21–13.42

CI, confidence interval; —, reference group for regression analysis.

a

Partial masking districts included: 4 districts that initially had optional masking and transitioned to masks required, 2 districts that transitioned between mask optional and required more than once during the study period, and 3 districts that had required and optional masking varying by either school grade level, or by community transmission threshold.