Short sleep affected 57.8% of middle-school and 72.7% of high-school students in the analyzed state data. Nine states contributed to the combined middle-school analysis and 30 to the high-school analysis.
57.8% of middle school students and 72.7% of high school students slept less than the recommended number of hours.
MMWR report
Short sleep affected 57.8% of middle-school and 72.7% of high-school students in the analyzed state data. Nine states contributed to the combined middle-school analysis and 30 to the high-school analysis. Supports the percentages with their school-level and state-coverage limits; does not by itself attribute short sleep to phones.