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

Table 2

Univariate analyses of depressive symptoms in relation to demographic and working characteristics.

Variable	Mean ± SD
Depressive symptoms	20.00±9.99
Age (years)		𝑃=0.057
≤30	21.25±10.07
31–40	19.55±9.85
41–50	19.74±10.01
>50	19.85±9.89
Marital status		𝑃=0.007
Single/divorced/widowed/separated	21.35±10.03
Married/cohabiting	19.73±9.86
Education		𝑃=0.043
Junior high school or under	20.42±9.82^a
Senior high school/technical secondary school	19.91±10.07
Junior college or above	18.67±10.30
Chronic disease		𝑃=0.093
Yes	20.51±10.07
No	19.72±9.93
Job rank		𝑃=0.216
Head miner	19.45±10.44
Staff miner	20.15±9.87
Monthly income (RMB, yuan)		𝑃=0.012
≤3000	20.23±10.09^b
3001–5000	20.37±9.88^c
>5000	18.59±10.10
Weekly working time (hours)		𝑃=0.073
≤40	19.34±10.11
>40	20.25±9.93

aComparison between subjects with junior high school or under education and those with junior college or above education.
^bComparison between subjects with monthly income ≤3000 yuan RMB and those with monthly income >5000 yuan RMB.
^cComparison between subjects with monthly income 3001–5000 yuan RMB and those with monthly income >5000 yuan RMB.