Table 2.

Prevalence of Depressive Symptoms and Univariate Logistic Regression Analysis of Factors Associated with Depression.

Characteristics		Prevalence of depressive symptoms (%)	OR (95% CI)
Sex: female		31.4	1.30 (1.12-1.50)
Age (years)
	20-29	29.2	Ref
	30-39	29.2	1.00 (0.80-1.25)
	40-49	29.7	1.02 (0.84-1.25)
	≥50	25.6	0.83 (0.69-1.01)
Electronic device use at work (hours per day)
	<4	26.5	Ref
	4-7	26.8	1.02 (0.86-1.20)
	≥7	33.4	1.39 (1.15-1.69)
Internet use in private life (hours per day)
	<2	26.2	Ref
	2-4	29.8	1.20 (1.03-1.40)
	≥4	35.5	1.55 (1.18-2.05)
Job class
	Low	30.3	Ref
	Intermediate	27.6	0.88 (0.73-1.06)
	High	18.8	0.53 (0.42-0.68)
Overtime (hours per month)
	<30	26.1	Ref
	30-45	34.9	1.51 (1.25-1.83)
	≥45	35.7	1.57 (1.20-2.05)
Job control
	High	17.2	Ref
	Intermediate	26.7	1.75 (1.43-2.13)
	Low	39.2	3.10 (2.57-3.73)
Job demands
	Low	20.5	Ref
	Intermediate	29.4	1.61 (1.35-1.91)
	High	41.3	2.72 (2.28-3.25)
Support at work
	High	18.0	Ref
	Intermediate	25.8	1.58 (1.30-1.92)
	Low	39.3	2.94 (2.43-3.56)
Married
	No	33.5	1.45 (1.25-1.69)
Caregiving
	Yes	33.9	1.39 (1.17-1.66)
Work-to-family conflict
	Low	10.6	Ref
	Intermediate	23.0	2.52 (2.00-3.18)
	High	48.6	7.96 (6.39-9.93)
Family-to-work conflict
	Low	18.0	Ref
	Intermediate	25.3	1.54 (1.27-1.86)
	High	48.3	4.25 (3.57-5.05)
Heavy drinking
	Yes	34.9	1.40 (1.05-1.88)
Smoking
	Yes	27.3	0.94 (0.75-1.19)
Longstanding illness
	Yes	33.3	1.40 (1.20-1.62)
Poor sleep quality
	Yes	53.2	6.01 (5.15-7.02)
Sleep duration (hours per day)
	<6	39.2	1.93 (1.64-2.27)
	6-9	25.0	Ref
	≥9	22.6	0.87 (0.38-2.04)

Notes: Correlations were evaluated using univariable logistic regressions and expressed as ORs with 95% CIs.

CI: confidence interval; OR: odds ratio.

Statistically significant values (p < 0.05) are shown in bold.