Prevalence and Associated Factors of Depressive Symptoms among Chinese Underground Coal Miners

Table 4

Hierarchical linear regression analyses of the factors associated with depressive symptoms.

Variables	Block 1 (β)	Block 2 (β)	Block 3 (β)
Age	−0.068*	−0.063*	−0.040
Marital status	−0.055*	−0.049	−0.073**
Education
Education 1	−0.067*	−0.069*	−0.058*
Education 2	−0.094**	−0.100**	−0.082**
Chronic disease	−0.050*	−0.045	−0.017
Job rank		−0.005	−0.008
Monthly income
Monthly income 1		−0.007	−0.059*
Monthly income 2		−0.068*	−0.084**
Weekly working time		0.103**	0.047*
ERI^†			0.298**
OC			0.065**
PPE			0.087**
WFC			0.077**
𝐹	5.02**	5.50**	30.65**
𝑅^2	0.013	0.025	0.172
Δ𝑅^2	0.013**	0.012**	0.147**

ERI: effort-reward imbalance; OC: overcommitment; PPE: perceived physical environment; WFC: work-family conflict.
^†ERI is log transformed.
Marital status: married/cohabiting versus single/divorced/widowed/separated; Education 1: senior high school/technical secondary school versus junior high school or under; Education 2: junior college or above versus junior high school or under; Chronic disease: “No” versus “Yes”; Job rank: staff miner versus lead miner; Monthly income 1: 3001–5000 yuan RMB versus ≤3000 yuan RMB; Monthly income 2: >5000 yuan RMB versus ≤3000 yuan RMB.
^∗𝑃<0.05, ^∗∗𝑃<0.01.