Do Schools Begin Too Early?

The author decides to examine how start times affect the academic performance of middle school students on standardized tests.

“I find that delaying school start times by one hour, from roughly 7:30 to 8:30, increases standardized test scores by at least 2 percentile points in math and 1 percentile point in reading. The effect is largest for students with below-average test scores, suggesting that later start times would narrow gaps in student achievement.”

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