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. 2019 Feb 4;19:56. doi: 10.1186/s12888-019-2041-7

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 highera −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 Weekb
 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 Correlationc 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