Table 2 Occupational factors and pulmonary function parameters of participants

 Administrative staff

17 (5.6%)

6.61 ± 2.53

0.87

7.7 ± 3.94

0.57

4.55 ± 0.59

0.70

12.61 ± 0.59

0.82

19.47 ± 4.23

0.60

 Driver

15 (4.9%)

5.48 ± 1.20

6. 04 ± 1.20

5.72 ± 047

6.74 ± 2.67

16.25 ± 10.87

 Worker

273 (89.5%)

7.93 ± 1.65

8. 07 ± 2.06

5.22 ± 0.67

11.31 ± 0.90

19.71 ± 8.34

  ≤ 7 years

157 (51.5%)

8.14 ± 1.92

0.57

8.58 ± 2.24

0.79

5.32 ± 0.71

0.75

12.45 ± 0.24

0.24

16.21 ± 8.20

0.93

  > 7 years

148 (48.5%)

7.31 ± 1.42

7.27 ± 2.00

5.09 ± 0.52

9.67 ± 1.73

22.55 ± 8.32

 Never

63 (20.7%)

8.4 ± 0.65

8.07 ± 1.22

3.45 ± 0.75

12.90 ± 1.50

26.65 ± 11.15

 Sometimes

35 (11.5%)

4.30 ± 2.82

0.38

5.80 ± 4.85

0.014

5.50 ± 3.20

0.70

6.08 ± 6.70

0.005

17.40 ± 9.70

0.002

 Usually

207 (67.9%)

8.00 ± 1.80

8.20 ± 1.80

5.50 ± 0.14

11 ± 0.85

17.70 ± 5.80

 Exposed

240 (78.7%)

7.70 ± 1.50

0.48

1.90 ± 17.90

0.36

5.40 ± 0.67

0.72

11.20 ± 0.90

0.90

19.90 ± 8.45

0.71

 No exposure

65 (21.30%)

8.09 ± 2.30

2.90 ± 8.09

4.50 ± 0.41

11.1 ± 1.10

18.25 ± 7.45