Table 6.

Hierarchical regression analysis of the determinants of depression using the PHQ-9 (n = 420).

PHQ-9
Variables	Model 1		Model 2		Model 3		Model 4
	β	t(p)	β	t(p)	β	t(p)	β	t(p)
Constant	12.122	3.439 ***	13.137	3.713 ***	11.586	3.296 ***	10.264	2.936 **
Preventive practice score	−0.165	−3.221 ***	−0.155	−3.027 **	−0.139	−2.745 **	−0.138	−2.749 **
Age	0.199	1.691	0.214	1.823	0.213	1.842	0.225	1.966 *
Sex
Male	(ref)		(ref)		(ref)		(ref)
Female	−0.145	−0.547	−0.097	−0.178	−0.020	−0.037	−0.231	−0.431
Educational level
Undergraduate	(ref)		(ref)		(ref)		(ref)
Graduate	−0.401	−0.531	−0.466	−0.620	−0.609	−0.820	−0.706	−0.963
Marital status
Single	(ref)		(ref)		(ref)		(ref)
Married	−0.990	−0.0742	−1.186	−0.892	−0.938	−0.714	−0.898	−0.693
Knowledge belief score	−0.142	−1.025	−0.149	−1.081	−0.109	−0.836	−0.165	−1.279
Satisfaction with the information
Low	(ref)		(ref)		(ref)		(ref)
High	−1.517	−1.415	−1.486	−1.392	−1.316	−1.249	−1.486	−1.426
Self-assessed physical condition
Fair or below			(ref)		(ref)		(ref)
Good or above			−1.865	−2.208 *	−1.702	−2.040 *	−1.501	−1.820
Patients’ contact history
No					(ref)		(ref)
Yes					−2.842	−0.983	−2.900	−1.015
Not sure					4.413	3.539 ***	4.069	3.287 ***
Concern about family members
Low							(ref)
High							1.580	2.624 **
Concern about this disease
Low							(ref)
High							1.098	2.081 *
F	2.778 **		3.063 **		3.875 ***		4.456 ***
R2	0.045		0.056		0.087		0.116
Adjusted R2	0.029		0.038		0.064		0.090
Durbin–Watson	1.972

Note: * p < 0.05; ** p < 0.01; *** p < 0.001.