Daily variation in sleep characteristics in individuals with and without post traumatic stress disorder

BMC Psychiatry

Table 2 Weekday versus Weekend Differences in Sleep Duration in the Total Sample and Participants with and without PTSD: Results of Mixed Models

Parameter	Total sample (N = 157)		With PTSD (N = 80)		Without PTSD (N = 77)
Parameter	Coefficient [95% CI]	p	Coefficient [95% CI]	p	Coefficient [95% CI]	p
Fixed effects
Intercept	7.04 [6.63, 7.44]	<.001	6.44 [5.93, 6.95]	<.001	7.04 [6.51, 7.57]	<.001
Female vs. male	−0.05 [−0.42, 0.32]	.789	−0.04 [− 0.57, 0.49]	.883	− 0.09 [− 0.66, 0.48]	.745
Age^a	0.00 [− 0.01, 0.02]	.864	0.00 [− 0.03, 0.03]	.903	0.00 [− 0.02, 0.02]	.794
White vs. non-white	− 0.92 [−1.32, − 0.52]	<.001	−0.84 [−1.43, − 0.26]	.005	−1.00 [− 1.58, − 0.43]	<.001
Some college or lower vs. bachelor’s or higher^b	−0.64 [− 1.07, − 0.20]	.004	−0.65 [− 1.32, 0.01]	.055	− 0.57 [− 1.20, 0.06]	.077
Phase 1 vs. 2	−0.06 [− 0.50, 0.38]	.778	−0.24 [− 0.89, 0.41]	.465	0.12 [− 0.51, 0.75]	.712
Weekday vs. weekend	−0.60 [− 0.76, − 0.45]	<.001	−0.54 [− 0.76, − 0.32]	<.001	−0.66 [− 0.87, − 0.44]	<.001
PTSD vs. non-PTSD	−0.56 [− 0.93, − 0.20]	.003	–	–	–	–

Note. CI = confidence interval; PTSD = post traumatic stress disorder. ^aAge was centered at the group mean. ^bBachelor’s degree or higher was set as the reference. See Supplement 4a-4c for results of mixed models for sleep quality, trouble falling asleep, and difficulty staying asleep

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