Selected events causing school closures — United States, 2011–2013.
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aStudent-days lost calculated by multiplying number of students per closure event [10] by number of unplanned closure days. Students were counted once for each closure event. Closure events where reopening date not specified were assumed to last 1 day.Selected events causing school closures — United States, 2011–2013.
创建时间：
2015-12-02
