Table 5.

Main Effects of Self-Report and Actigraphy Sleep Efficiency, Shift Worker Status, and Daily Work Schedule on Next-Day Stress

	Next-Day Stress			Next-Day Stress
Predictors	Estimates	CI	p	Estimates	CI	p
(Intercept)	0.833	0.429 – 1.237	<0.001	0.777	0.346 – 1.208	<0.001
Age	0.001	−0.004 – 0.007	0.711	0.001	−0.004 – 0.007	0.628
Gender	0.145	−0.075 – 0.365	0.195	0.116	−0.110 – 0.341	0.315
Shift worker status	−0.057	−0.110 – 0.086	0.436	−0.051	−0.197 – 0.096	0.498
Daily work schedule (day shift)	0.091	0.039 – 0.143	0.001	0.085	0.032 – 0.139	0.002
Daily work schedule (night shift)	0.042	−0.053 – 0.137	0.384	0.061	−0.039 – 0.160	0.232
Self-report sleep efficiency (%)	−0.003	−0.006 – <−0.001	0.041
Actigraphy sleep efficiency (%)				−0.002	−0.006 – 0.001	0.218
Random Effects
σ2	0.52			0.52
τ00	0.31 ID			0.32 ID
ICC	0.37			0.38
N	389 ID			386 ID
Observations	4228			3967
Marginal R2 / Conditional R2	0.006 / 0.375			0.004 / 0.382

Note. Bold values represent p <.05 estimates. Gender was coded as 0 = male, 1 = female. Shift worker status was coded as 0 = day worker (worked no night shifts in the past 14 days), 1= night shift worker (worked at least one night shift in the past 14 days). Daily work schedule was dummy coded, with days off as the reference group. Daily stress and daily work schedule are within-person (level 1) variables and all other predictors are between-person (level 2) variables. CI = 95% confidence intervals. p = p-value. For random effects: σ² represents level 1 variance (within-person), τ₀₀ represents level 2 variance (between-person), ICC represents the intraclass correlation coefficient, N is the total Level 2 sample size, and Observations are the number of Level 1 daily observations.