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Volume 19, Number 2—February 2013


Risk Factors for Influenza A(H1N1)pdm09 among Students, Beijing, China

Yang Zheng1, Wei Duan1, Peng Yang, Yi Zhang, Xiaoli Wang, Li Zhang, Surabhi S. Liyanage, and Quanyi WangComments to Author 
Author affiliations: Author affiliations: Beijing Center for Disease Control and Prevention, Beijing, People’s Republic of China (Y. Zheng, W. Duan, P. Yang, Y. Zhang, X. Wang, L. Zhang, Q. Wang); University of New South Wales, Sydney, New South Wales, Australia (S.S. Liyanage)

Main Article

Table 2

Multivariate analysis of independent factors associated with influenza A(H1N1)pdm09 infection among students <18 years of age, Beijing, China*

Variable p value Matched OR (95% CI)
Vaccination against influenza A(H1N1)pdm09
No Referent
0.07 (0.04–0.11)
Handwashing immediately after sneezing
No Referent
0.49 (0.33–0.72)
Sleep time, h/day
<7 Referent
0.62 (0.38–0.98)
Classroom space/student, m2
<1.6 Referent
0.11 (0.04–0.31)
Participation in outdoor activities after class
No Referent
0.60 (0.38–0.95)
Frequency of classroom ventilation
>1×/h Referent
0.60 (0.39–0.93)
Mode of transportation to and from school
Closed (taxi, public transportation, school bus, car) Referent
Open (walking, bicycle, motorcycle)
0.58 (0.39–0.88)
Participation in clustered social activities after school
No Referent
Yes 0.025 2.08 (1.10–3.95)

*Ten variables were included in multivariate conditional logistic regression analysis. Backward conditional logistic regression was conducted by removing variables with p>0.10, and 8 variables remained in the final regression model. All statistical tests were 2-sided, and significance was defined as p<0.05. The statistic for each variable was obtained after adjustment for other 7 variables in the final regression model.

Main Article

1These authors contributed equally to this article.