Thread by @DrEricDing

SCHOOL #COVID FACTORS—

Pandemic theatre: Desk plexiglass shields (even increases risk—possibly disrupting ventilation).

No effect: Same teacher, reduced class size.

Good: Masking (teachers & kids), daily symptom screening, no extracurriculars, cohort.🧵
science.sciencemag.org/content/early/…

2) “School-based mitigation measures are associated with significant reductions in risk, particularly daily symptoms screens, teacher masking, and closure of extra-curricular activities.”

3) “A positive association between in-person schooling and COVID-19 outcomes persists at low levels of mitigation, but when seven or more mitigation measures are reported, a significant relationship is no longer observed.”

4) “Among teachers, working outside the home was associated with an increase in COVID-19-related outcomes, but this association is similar to other occupations (e.g., healthcare, office work).”

5) (A) Number of survey respondents reporting a school age student in the household by county. (B) Percentage of households with school age children reporting any in-person schooling by county, excluding counties with fewer than 10 responses (excluded counties in dark grey).

6) (C) Percentage of households reporting a child in in-person schooling who report full-time in-person schooling, excluding counties with fewer than 10 reporting in-person schooling.

7) (D) Average number of school-based mitigation measures reported for children with in-person schooling, excluding counties with fewer than 10 reporting in-person schooling

8) Odds ratio of COVID-19-related outcomes associated with full- and part-time in-person schooling by outcome and grade level, compared to individuals with children in their household not attending in-person schooling

9) “After adjusting for county-level incidence & other individual- & county-level factors, living in a household with a child engaged in full-time in-person schooling is associated with a substantial increase in the odds [1.38, 95% CI 1.30-1.47] of reporting COVID-19 like illness

10) “…CLI, fever of at least 100°F, along with cough, shortness of breath, or difficulty breathing), loss of taste or smell (aOR 1.21, 95% CI 1.16-1.27), or a positive SARS-CoV-2 test result within the previous 14 days (aOR 1.30, 95% CI 1.24-1.35) “

11) “When stratifying by grade level (restricted to households reporting children in a single grade strata), we find that the strength of the associations with full-time schooling increases with grade”

12) For students engaged in any form of in-person learning, the most common mitigation measure reported was student mask mandates (88%, unweighted), followed by teacher mask mandates (80%)…”

13) “…restricted entry (e.g., no parents or caregivers allowed into school) (66%) and extra space between desks (63%) (see table S5 for survey weighted rates).”

14) “There is substantial geographic heterogeneity in the number of mitigation measures reported (Fig. 1D, fig. S7, and tables S5 and S7), with households in South Dakota reporting the least (@KristiNoem?), and households in Vermont reporting the most”

15) Here are the best practice guidelines for safe indoor air for schools, in addition to the above measures.

https://twitter.com/DrEricDing/status/1365678603212648461