Table 3.

Association between SES and sleep quality patterns mediated by depressive symptom at years 4

	Trajectory groups of sleep quality
	Moderate-stable (n = 1157) vs. normal-stable (n = 1697)		Poor-stable (n = 320) vs. normal-stable (n = 1697)		Developing to poor (n = 84) vs. normal-stable (n = 1697)		Severely poor-stable (n = 89) vs. normal-stable (n = 1697)
	OR	95% CI	OR	95% CI	OR	95% CI	OR	95% CI
Education attainment*
Lower attainment‡ (n = 2617) vs. higher attainment§ (ref, n = 727)
Total effect	0.80	(0.64 to 1.01)	1.15	(0.72 to 1.83)	1.55	(0.64 to 6.03)	2.69	(1.14 to 9.43)
Natural direct effect	0.76	(0.62 to 0.96)	1.04	(0.66 to 1.64)	1.38	(0.58 to 5.09)	2.30	(0.97 to 8.01)
Natural indirect effect	1.05	(1.01 to 1.09)	1.10	(1.04 to 1.20)	1.12	(1.04 to 1.24)	1.17	(1.06 to 1.32)
Monthly household income†
Lower income|| (n = 2319) vs. Higher income¶ (ref, n = 1007)
Total effect	0.98	(0.81 to 1.19)	0.998	(0.72 to 1.41)	0.97	(0.46 to 2.07)	1.20	(0.58 to 2.92)
Natural direct effect	0.93	(0.78 to 1.14)	0.91	(0.67 to 1.29)	0.90	(0.42 to 1.91)	1.04	(0.49 to 2.49)
Natural indirect effect	1.05	(1.02 to 1.09)	1.09	(1.03 to 1.16)	1.09	(1.03 to 1.18)	1.15	(1.07 to 1.29)

In total, 395 data were deleted due to no measurements of BDI scores at years 4.

*Adjustments for sex, age, job, monthly household income, drinking, smoking, moderate exercise, disease diagnosis, insomnia symptom, and depressive mood at baseline.

^†Adjustments for sex, age, job, education attainment, drinking, smoking, moderate exercise, number of family members, disease diagnosis, insomnia symptom, and depressive mood at baseline.

^‡High school or less.

^§College or above.

^||<$2500.

^¶≥$2500.