Table 3.

Hierarchical Regression Results of CES-D Score

Variables	Block 1	Block 2	Block 3
Age	−0.010	−0.018	−0.010
Gender	−0.008	−0.012	−0.010
Shift work	0.038	−0.014	−0.017
Night duty	−0.059*	0.012	−0.006
Occupational category
Dummy_1	−0.039	−0.020	−0.014
Dummy_2	−0.076**	−0.041*	−0.032
Dummy_3	−0.115**	−0.056**	−0.035*
SPOS score		−0.538**	−0.422**
GSES score		−0.313**	−0.379**
Interaction			0.334**
F	6.484**	190.888**	253.932**
Adjusted R2	0.024	0.485	0.582
ΔR2	0.024	0.461	0.097

Notes: Gender, women versus men; shift work, no versus yes; night duty, no versus yes; Dummy_1, chemical workers versus refinery workers; Dummy_2, transportation workers versus refinery workers; Dummy_3, other workers versus refinery workers. *p<0.05; **p<0.01 (two-tailed).

Abbreviations: CES-D score, score of depressive symptoms; SPOS score, score of perceived organizational support; GSES score, score of self-efficacy.