Selected characteristics of school closure events and schools by reason for school closure — United States, 2011–2013.

a<p>Closure events where reopening date not specified were assumed to last 1 day.</p>b<p>Percents reported out of number of events where data on number of students affected were known: 194 illness-, 2620 natural disaster-, 802 building/utilities-, 144 violence-, and 14625 weather-related events.</p>c<p>Schools were counted once for each closure event.</p><p>Selected characteristics of school closure events and schools by reason for school closure — United States, 2011–2013.