Table 4 Logistic regression analysis for potential risk factors associated with abnormal indexes of coal miners in 2016

OR(95% CI)

OR(95% CI)

OR(95% CI)

OR(95% CI)

 Female

1.00

1.00

1.00

1.00

 Male

1.28 (0.92–1.78)

1.06 (0.80–1.41)

1.01 (0.86–1.19)

1.00 (0.85–1.18)

 ≤ 30

1.00

1.00

1.00

1.00

 31–40

4.05 (1.92–8.54)^*

0.88 (0.52–1.49)

1.19 (0.94–1.51)

1.92 (1.48–2.50)^*

 41–50

2.71 (1.24–5.90)^*

1.30 (0.75–2.25)

1.49 (1.14–1.94)^*

2.13 (1.60–2.84)^*

 > 50

1.75 (0.75–4.09)

1.16 (0.62–2.18)

1.44 (1.02–2.03)^*

1.98 (1.39–2.81)^*

 ≤ 10

1.00

1.00

1.00

1.00

 11–20

1.26 (0.97–1.64)

2.93 (2.27–3.79)^*

1.82 (1.60–2.08)^*

0.89 (0.77–1.03)

 > 20

1.70 (1.33–2.17)^*

2.64 (2.09–3.34)^*

1.29 (1.12–1.48)^*

0.98 (0.86–1.11)

 No

1.00

1.00

1.00

1.00

 Yes

1.20 (0.83–1.72)

1.92 (1.34–2.71)^*

0.93 (0.61–1.50)

1.16 (0.95–1.42)

 No

1.00

1.00

1.00

1.00

 Yes

2.20 (1.61–3.00)^*

1.26 (0.97–1.64)

1.11 (0.95–1.31)

1.20 (1.03–1.40)^*

 Ground auxiliary

1.00

1.00

1.00

1.00

 Tunneling

0.97 (0.65–1.47)

0.91 (0.57–1.43)

2.05 (1.77–2.38)^*

1.01 (0.85–1.19)

 Coal extraction

2.16 (1.57–2.97)^*

2.43 (1.88–3.14)^*

2.15 (1.78–2.59)^*

1.27 (1.04–1.56)^*

 Pulverized coal

2.56 (2.02–3.24)^*

0.95 (0.73–1.23)

1.75 (1.51–2.04)^*

2.37 (2.07–2.70)^*

 Underground auxiliary

1.80 (1.41–2.30)^*

1.50 (1.21–1.85)^*

2.67 (2.35–3.05)^*

1.23 (1.07–1.42)^*

 Large

1.00

1.00

1.00

1.00

 Medium

0.95 (0.70–1.28)

1.75 (1.34–2.28)^*

1.88 (1.61–2.20)^*

1.09 (0.93–1.29)

 Small

0.90 (0.61–1.17)

1.88 (1.39–2.55)^*

1.95 (1.66–2.29)^*

1.14 (0.96–1.36)