September School Epidemics
Based on papers published by Malcolm Sears and Neil Johnston

The peak of the epidemic of asthma hospitalization in school-age children in Canada is synchronized with school return after the summer vacation, which occurs the day after Labor Day (first Monday in September in the USA and Canada). Every year between 1990 and 2004, the peak occurred during week 38 (September 17-23) except in 1992 (week 39) and 1997 and 2003 (week 37). In 1992, Labor Day was at its latest possible date (September 7) and in 1997 and 2003 at its earliest (September 1).

Authors applied mathematical modeling to estimate the exact timing and magnitude of these September peaks in Canada. In school-age children, the asthma hospitalization peak occurred on average 17.7 days after Labor Day


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