Volume 19, Number 2—February 2013
Risk Factors for Influenza A(H1N1)pdm09 among Students, Beijing, China
|Variable||p value||Matched OR (95% CI)|
|Vaccination against influenza A(H1N1)pdm09|
|Handwashing immediately after sneezing|
|Sleep time, h/day|
|Classroom space/student, m2|
|Participation in outdoor activities after class|
|Frequency of classroom ventilation|
|Mode of transportation to and from school|
|Closed (taxi, public transportation, school bus, car)||Referent|
| Open (walking, bicycle, motorcycle)
|Participation in clustered social activities after school|
*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.
1These authors contributed equally to this article.