Daily variation in post traumatic stress symptoms in individuals with and without probable post traumatic stress disorder

Table 2 Day of Week Difference in PTSS in Participants with and without Probable PTSD: Mixed Models

	Probable PTSD (N = 42)		Without PTSD (N = 38)
Parameter	Coefficient [95% CI]	p	Coefficient [95% CI]	p
Fixed effects
Intercept	67.37 [44.67, 90.06]	<.001	12.35 [−1.35, 26.04]	.076
Female vs. male	0.90 [−20.45, 22.24]	.933	1.85 [−9.95, 13.65]	.752
Age (centered at 37.2)	−0.02 [−1.71, 1.68]	.985	0.45 [−0.07, 0.97]	.086
Non-White vs. White	−12.46 [−37.65, 12.72]	.322	8.78 [−5.34, 22.90]	.215
Lower than college vs. some college/tech school or higher^a	−2.51 [− 32.97, 27.94]	.868	3.76 [−9.03, 16.54]	.554
Phase 1 vs. 2	2.86 [−18.16, 23.87]	.784	5.03 [−7.19, 17.25]	.408
Day of Week^b
Monday	8.53 [3.19, 13.86]	.002	1.83 [−1.19, 4.85]	.234
Tuesday	9.35 [4.03, 14.68]	.001	1.67 [−1.32, 4.66]	.272
Wednesday	8.15 [2.93, 13.37]	.002	0.98 [−2.04, 4.00]	.523
Thursday	6.11 [0.95, 11.26]	.021	0.83 [−2.12, 3.78]	.580
Friday	5.60 [0.48, 10.73]	.032	−0.23 [−3.12, 2.65]	.873
Sunday	2.51 [−2.76, 7.78]	.348	−0.88 [− 3.84, 2.08]	.560
Random effects
Between-person variance	1050.46	<.001	270.22	.001
Autocorrelation	0.45	<.001	0.48	<.001
Within-person variance	535.28	<.001	169.12	<.001
Intraclass Correlation^c	0.66		0.62

Note. ^aSome college/technical school or higher was set as the reference. ^bSaturday was set as the reference. PTSS varied across the seven days among participants with probable PTSD, F(6, 228) = 3.05, p = .007, but not among those without PTSD, F(6, 215) = 0.82, p = .559. ^cIntraclass Correlation was calculated by the ratio of between-person variance and the total variance

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