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

Table 3

Correlations of continuous independent variables with depressive symptoms.

Variables	Mean ± SD	Correlation with depressive symptoms
Age	40.18±9.25	−0.031
Weekly working time	50.97±10.42	0.083**
ERI^†	0.69±0.24	0.368**
OC	15.29±2.85	0.179**
PPE	30.51±7.08	0.209**
WFC	3.37±0.77	0.188**

ERI: effort-reward imbalance; OC: overcommitment; PPE: perceived physical environment; WFC: work-family conflict.
^†The mean of the ERI is logarithmic.
^∗∗𝑃<0.01.