APPENDIX 3

Behavioral Difficulties Subscale Scores, Mean (95% CI), by Weekday Bedtimes at Age 7

Mean Score (CI)
Mother ReportTeacher Report
Conduct problems
 Before 7:301.33 (1.23 to 1.43)0.71 (0.58 to 0.84)
 7:30–7:591.23 (1.16 to 1.31)0.70 (0.61 to 0.79)
 8:00–8:291.30 (1.23 to 1.36)0.66 (0.60 to 0.73)
 8:30–8:591.27 (1.19 to 1.34)0.60 (0.52 to 0.69)
 9:00 or later1.43 (1.31 to 1.56)0.77 (0.62 to 0.91)
 Not regular1.79 (1.66 to 1.93)0.92 (0.76 to 1.09)
Hyperactivity
 Before 7:303.27 (3.09 to 3.45)2.87 (2.63 to 3.11)
 7:30–7:593.12 (3.00 to 3.25)2.62 (2.45 to 2.78)
 8:00–8:293.22 (3.11 to 3.32)2.65 (2.51 to 2.79)
 8:30–8:593.06 (2.93 to 3.20)2.51 (2.33 to 2.70)
 9:00 or later3.47 (3.30 to 3.65)2.86 (2.60 to 3.12)
 Not regular3.81 (3.62 to 3.99)3.27 (2.97 to 3.57)
Emotional symptoms
 Before 7:301.53 (1.40 to 1.65)1.45 (1.27 to 1.62)
 7:30–7:591.42 (1.34 to 1.50)1.35 (1.24 to 1.46)
 8:00–8:291.38 (1.32 to 1.45)1.44 (1.35 to 1.53)
 8:30–8:591.35 (1.25 to 1.46)1.27 (1.14 to 1.40)
 9:00 or later1.64 (1.49 to 1.78)1.30 (1.12 to 1.47)
 Not regular1.83 (1.68 to 1.97)1.68 (1.48 to 1.87)
Peer problems
 Before 7:301.18 (1.06 to 1.30)1.21 (1.06 to 1.36)
 7:30–7:591.10 (1.02 to 1.17)1.05 (0.96 to 1.13)
 8:00–8:291.06 (1.00 to 1.12)1.05 (0.97 to 1.13)
 8:30–8:590.96 (0.88 to 1.04)0.93 (0.83 to 1.02)
 9:00 or later1.29 (1.16 to 1.41)1.05 (0.91 to 1.19)
 Not regular1.57 (1.43 to 1.70)1.32 (1.14 to 1.50)