Table 3.

Hierarchical multiple regression of explanatory variables for depressive symptoms

Variables	Model I		Model II		Model III		Model IV
	B	t	B	t	B	t	B	t
Age (year)	−0.223	−6.294*	−0.223	−6.891*	−0.182	−5.666*	−0.189	−6.299*
Marital status†
Unmarried	2.965	7.148*	2.484	6.554*	1.493	3.929*	1.351	3.811*
Divorced/Widowed	8.181	4.431*	8.733	5.182*	7.451	4.439*	8.029	5.126*
Education level†	−2.931	−10.195*	−2.134	−8.092*	−2.030	−7.723*	−1.532	−6.227*
Alcohol drinking†	0.469	1.669*	0.643	2.507*	−0.044	−0.172*	0.187	0.782*
BMI (kg/m2)	0.196	4.389*	0.171	4.189*	0.091	2.243*	0.089	2.333*
Job tenure (years)	0.004	0.088*	0.042	1.068*	−0.037	−0.948*	0.001	0.033*
Job stress (KOSS-SF)			0.368	31.272*			0.301	26.934*
Sleep Quality (PSQI)					1.491	32.015*	1.235	27.756*
Constant	13.102		−4.061		7.592		−5.524
F	51.557*		176.397*		182.709*		267.151*
Adjusted R2	0.068*		0.223*		0.229*		0.329*
R2 change	0.069*		0.156*		0.162*		0.261*

Model I: adjusted by age, marital status, education level, alcohol drinking, BMI ,job tenure.

Model II: adjusted for modelI plus job stress (KOSS-SF).

ModelIII: adjusted for modelI plus sleep quality (PSQI).

ModelIV: adjusted for modelI plus job stress (KOSS-SF) and sleep quality (PSQI).

*p<0.001

^†m0061rital status (0:married, 1:unmarried, 2:divorced/widowed).

education level (0:high school graduate, 1:college graduate).

alcohol drinking(0:no, 1:yes).