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. 2018 Nov 3;42(2):zsy212. doi: 10.1093/sleep/zsy212

Figure 2.

Figure 2.

Adjusted estimates of 24-hour sleep duration, sleep onset, sleep offset by categorical school start time. N = 383 adolescents with 1116 school-day observations clustered in multilevel models to measure actigraphic 24-hour sleep duration (panel A), sleep onset (panel B), and sleep offset (panel C), as predicted by categorical school start times. Vertical bars begin and end at groups that differ significantly, and the absence of a bar reflects no statistical difference (p > .10). Post-hoc tests were only significant in the model testing school start times and sleep offset when comparing adolescents with school start times before 07:30 with adolescents with school start times from 07:30 to 07:59 (β = 19.9 minutes, SE = 8.0 minutes, p < .05) and comparing adolescents with school start times before 07:30 with adolescents with school start times from 08:00 to 08:29 (β = 31.6 minutes, SE = 7.8 minutes, p < .01). †p ≤ .10, *p < .05, **p < .01, ***p < .001.