Skip to main content

Table 1 Demographic data of the study population

From: Follow-up of the manganese-exposed workers healthy cohort (MEWHC) and biobank management from 2011 to 2017 in China

Variables Onsite workers Retired workers P
Number Percent Number Percent
(n = 2359) (n = 612)
Sex
 Male 1453 61.59 231 37.75 0.00
 Female 906 38.41 381 62.25
Age, years
 < 30 249 10.56 0 0.00 0.00
 30–40 818 34.68 0 0.00
 40–50 1100 46.63 4 0.65
 50–60 185 7.84 105 17.16
 60–70 7 0.30 159 25.98
 70–80 0 0.00 245 40.03
 ≥ 80 0 0.00 99 16.18
Race/ethnicity
 Han Chinese 1148 48.66 401 65.52 0.00
 Zhuang minority 1109 47.01 189 30.88
 Other ethnic groups 92 3.90 21 3.43
 Missing 10 0.42 1 0.16
Marital status
 Single 293 12.42 11 1.80 0.00
 Married 1989 84.32 451 73.69
 Widowed or divorced 73 3.09 149 24.35
 Missing 4 0.17 1 0.16
Education
 Middle school or lower 948 40.19 470 76.80 0.00
 High school 1050 44.51 111 18.14
 University/college or higher 358 15.18 29 4.74
 Missing 3 0.13 2 0.33
Seniority, years
 < 10 775 32.85 8 1.31 0.00
 10–20 750 31.79 90 14.71
 20–30 693 29.38 260 42.48
 ≥ 30 138 5.85 253 41.34
 Missing 3 0.13 1 0.16
Smoking status
 Current smoker 877 37.18 63 10.29 0.00
 Former smoker 160 6.78 81 13.24
 Never smoker 1317 55.83 466 76.14
 Missing 5 0.21 2 0.33
Drinking status
 Current drinker 1071 45.40 132 21.57 0.00
 Former drinker 386 16.36 102 16.67
 Never drinker 896 37.98 374 61.11
 Missing 6 0.25 4 0.65
BMI, kg/m2    0.00
 < 18.5 88 3.73 9 1.47  
 18.5–24 1445 61.25 232 37.91  
 24–28 670 28.40 251 41.01  
 ≥ 28 136 5.77 94 15.36  
 Missing 20 0.85 26 4.25  
Height, cm (mean ± SD) 163.18 ± 7.56 155.29 ± 7.78  
Weight, kg (mean ± SD) 60.46 ± 9.95 57.99 ± 9.68  
  1. BMI body mass index. SD standard deviation