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Volume 29, Number 9—September 2023
Dispatch

Effects of School-Based Preventive Measures on COVID-19 Incidence, Hong Kong, 2022

Tim K. TsangComments to Author , Xiaotong Huang, Min Whui Fong, Can Wang, Eric H.Y. Lau, Peng Wu, and Benjamin J. Cowling
Author affiliations: The University of Hong Kong, Hong Kong, China (T.K. Tsang, X. Huang, M.W. Fong, C. Wang, E.H.Y. Lau, P. Wu, B.J. Cowling); Laboratory of Data Discovery for Health Limited, Hong Kong Science and Technology Park, Hong Kong (T.K. Tsang, E.H.Y. Lau, P. Wu, B.J. Cowling)

Main Article

Table 2

Incidence rate and incidence rate ratio estimates according to the Poisson generalized additive regression model in study of effects of school-based preventive measures on COVID-19 incidence, Hong Kong, 2022*

Period and age group Incidence rate† IRR (95% CI)
Normal school days
Age, y
>18 169 Referent
2–5 204 1.24 (1.22–1.25)
6–11 220 1.34 (1.32–1.35)
12–17
 196
 1.19 (1.18–1.2)
School closure
Age, y
>18 727 Referent
2–5 622 0.69 (0.68–0.71)
6–11 560 0.58 (0.57–0.59)
12–17
 461
 0.54 (0.53–0.54)
Summer holiday
Age, y
>18 292 Referent
2–5 370 0.88 (0.85–0.91)
6–11 324 0.72 (0.7–0.74)
12–17 275 0.68 (0.66–0.7)

*Adjusted for the time trend of COVID-19 cases. IRR, incidence rate ratio. †Per 1,000 person-years.

Main Article

Page created: July 12, 2023
Page updated: August 20, 2023
Page reviewed: August 20, 2023
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