Table 4.

Slope coefficient estimates, 95% confidence intervals, z score statistics, and P values from 3-level linear mixed models on the entire dataset for exploring associations between sleep features^a and the PHQ-8 score and sleep subscore^b.

Features	PHQ-8c score					Sleep subscore
	Coeff.d	95% CI	z score	P value	Coeff.		95% CI	z score	P value
Av_tst	0.013	0.006, 0.019	3.93	<.001	–0.004		–0.034, 0.025	–0.28	.78
Av_time_bed	0.016	0.009, 0.023	4.45	<.001	0.005		–0.028, 0.038	0.29	.77
Deep_pct	–0.007	–0.026, 0.011	–0.75	.45	–0.104		–0.191, –0.017	–2.34	.02
Light_pct	–0.032	–0.064, –0.001	–2.02	.04	0.090		–0.057, 0.237	1.20	.23
REM_pct	0.003	–0.021, 0.027	0.25	.80	–0.125		–0.238, –0.012	–2.17	.03
NREM_pct	–0.038	–0.062, –0.014	–3.12	.002	–0.014		–0.127, 0.098	–0.25	.80
Awake_pct	0.035	0.022, 0.048	5.45	<.001	0.139		0.079, 0.199	4.58	<.001
Av_onset	0.007	–0.001, 0.015	1.71	.09	0.078		0.040, 0.115	4.03	<.001
Av_offset	0.025	0.017, 0.033	6.19	<.001	0.097		0.060, 0.135	5.10	<.001
REM_L	0.034	–0.021, 0.088	1.21	.23	0.085		–0.178, 0.347	0.63	.53
Std_tst	0.008	0.004, 0.012	4.07	<.001	0.047		0.028, 0.067	4.77	<.001
Std_onset	0.012	0.004, 0.019	3.11	.002	0.060		0.022, 0.097	3.13	.002
Std_offset	0.012	0.005, 0.018	3.58	<.001	0.069		0.037, 0.100	4.26	<.001
Efficiency	–0.025	–0.037, –0.012	–3.91	<.001	–0.108		–0.167, –0.050	–3.65	<.001
Awake_5	0.016	0.010, 0.022	5.53	<.001	0.038		0.011, 0.065	2.77	.006
WKD_diff	0.134	0.039, 0.230	2.76	.006	0.747		0.255, 1.240	2.98	.003
M_insomnia	0.370	0.211, 0.530	4.55	<.001	2.373		1.595, 3.151	5.98	<.001
Dur_10	0.309	0.195, 0.423	5.30	<.001	0.909		0.357, 1.462	3.23	.001

^aDefinitions of sleep features in this table are shown in Table 1.

^bSleep subscore represents the score of subitem 3 in the PHQ-8.

^cPHQ-8: Patient Health Questionnaire 8-item.

^dSlope coefficient estimates for all sleep features.