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Table 1 Characteristics of the copper-nickel worker sample population

From: The status of job burnout and its influence on the working ability of copper-nickel miners in Xinjiang, China

Items Groups Case Number Percentage (%)
Sex Male 1116 89.00
Female 138 11.00
Age (years) < 25 327 26.08
25~ 339 27.03
30~ 159 12.68
35~ 132 10.53
40~ 174 13.88
45~ 123 9.81
Number of working years ≤5 666 53.11
6~ 450 35.89
11~ 138 11.00
Education level Junior high school and below 204 16.27
High school 297 23.68
Junior college 627 50.00
Bachelor’s degree or above 126 10.05
Marital status Unmarried 444 35.41
Married 810 64.59
Professional title None 813 64.83
Primary 216 17.22
Intermediate and above 225 17.94
Income (yuan) < 2500 252 20.10
2500~ 582 46.41
3000~ 171 13.64
3500~ 108 8.61
4000~ 141 11.24
work units Mining unit 441 35.17
Beneficiation unit 267 21.29
Smelting unit 546 43.54
Total   1254 100%