TABLE 2—
Effect of School District Policy (Physical Distancing, Masking, and Quarantine) on Hazard Rate of COVID-19 Among K–12 Educators, Stratified by Grade Level: Wisconsin, September 2–November 24, 2021
| School Setting and Policy | Model Data Assumptionsa HR (95% CI)b | |
| Complete Cases | Imputed | |
| Elementary school | ||
| Distancing | 1.14 (0.93, 1.40) | 1.06 (0.92, 1.23) |
| Masking | 0.78 (0.60, 1.03) | 0.83 (0.70, 0.99) |
| Quarantine | 1.01 (0.82, 1.23) | 1.06 (0.92, 1.21) |
| Middle School | ||
| Distancing | 1.05 (0.76, 1.47) | 0.97 (0.79, 1.19) |
| Masking | 1.02 (0.68, 1.54) | 0.74 (0.58, 0.95) |
| Quarantine | 0.89 (0.66, 1.22) | 0.99 (0.81, 1.20) |
| High School | ||
| Distancing | 1.23 (0.96, 1.60) | 1.19 (0.99, 1.44) |
| Masking | 0.76 (0.53, 1.07) | 0.77 (0.61, 0.98) |
| Quarantine | 0.96 (0.75, 1.23) | 0.91 (0.76, 1.08) |
| Overall | ||
| Distancing | 1.11 (0.96, 1.28) | 1.08 (0.98, 1.19) |
| Masking | 0.81 (0.67, 0.98) | 0.81 (0.72, 0.92) |
| Quarantine | 1.00 (0.87, 1.15) | 0.98 (0.89, 1.07) |
Note. CI = confidence interval; HR = hazard ratio.
Reflects 2 data sets treating missing policy data in distinct ways: (1) only school districts with complete data for all 3 policies or (2) imputed data for missing policy information using information from nonmissing district-level characteristics. Multivariate model adjusted for each of the 3 policies (masking, distancing, quarantine), teacher full vaccination status by start of school, National Center for Education Statistics school district locale, and spline terms for the following variables: teacher age (years), percentage of school district community fully vaccinated, weekly COVID-19 incidence rate in the school district community, and average student:teacher ratio in school district.
HRs and CIs associated with policy implementation, robust vs absent. Robust indicates policy in place for both students and staff. Absent indicates policy in place for neither students nor staff. The partial categories of any given policy (i.e., policy in place for either students or staff) are not presented because of small numbers.