Table 2.

Average Actigraphy-Assessed Sleep Variables at Typical Sleep and Sleep Extension by Chronotype

				P-values
		Model-Estimated Means (95% CI)		Comparison by Sleep Condition		Comparison by Chronotype
Outcome	Chronotype	Typical Sleep	Sleep Extension	Morning/ Intermediate	Evening	Typical Sleep	Sleep Extension
Sleep Onset (clock time)	Morning/ Intermediate	00:26 (23:47, 01:04)	22:52 (22:14, 23:31)	<0.001	<0.001	0.346	0.064
	Evening	00:50 (00:18, 01:23)	23:41 (23:09. 00:14)
Sleep Offset* (clock time)	Morning/ Intermediate	06:39 (06:12, 07:06)	06:42 (06:20, 07: 06)	0.635	0.049	0.358	0.030
	Evening	06:54 (06:34, 07:16)	07:23 (07:02, 07:45)
Sleep midpoint (clock time)	Morning/ Intermediate	03:34 (03:05, 04:01)	02:50 (02:22, 03:18)	0.005	0.111	0.385	0.039
	Evening	03:50 (03:26, 04:14)	03:31 (03:07, 03:54)
Sleep duration (hours)	Morning/ Intermediate	5.76 (5.26, 6.26)	7.15 (6.65, 7.65)	<0.001	<0.001	0.359	0.322
	Evening	5.45 (5.03, 5.87)	6.81 (6.39, 7.24)
Sleep efficiency (%)	Morning/ Intermediate	88.65 (86.37, 90.94)	87.11 (84.83, 89.4)	0.221	0.159	0.279	0.289
	Evening	86.97 (85.04, 88.9)	85.47 (83.54, 87.39)
Sleep onset latency (min)	Morning/ Intermediate	5.94 (2.7, 9.18)	9.77 (6.53, 13.01)	0.093	0.006	0.933	0.476
	Evening	5.76 (3.02, 8.49)	11.33 (8.6, 14.06)
Wake after sleep onset (min)	Morning/ Intermediate	29.27 (19.61, 38.93)	46.99 (37.33, 56.65)	0.005	0.001	0.702	0.737
	Evening	31.76 (23.61, 39.92)	49.19 (41.03, 57.34)

^*Model adjusted for season of study participation.