TABLE 1

Behavioral Difficulty Scores, Mean (95% confidence interval [CI]), by Weekday Bedtimes at Age 7

Mean (CI) Total Difficulties Score
Mother ReportTeacher Report
Before 7:306.93 (6.51 to 7.34)5.88 (5.41 to 6.34)
7:30–7:596.49 (6.25 to 6.74)5.46 (5.15 to 5.76)
8:00–8:296.62 (6.41 to 6.84)5.60 (5.33 to 5.87)
8:30–8:596.33 (6.06 to 6.60)5.12 (4.79 to 5.45)
9:00 or later7.42 (7.01 to 7.82)5.75 (5.24 to 6.26)
Not regular8.47 (8.01 to 8.92)6.86 (6.25 to 7.46)