Table 1 Demographic characteristics of workers exposed to silica dust and prevalence of obstructive (FEV1/FVC < 70%) and restrictive (FVC/Pre < 80%) pulmonary ventilation dysfunction
Demographic characteristics | Silica dust | |||
|---|---|---|---|---|
Sample size | FEV1/FVC < 70% | FVC/Pre < 80% | ||
2064 | 47(2.3) | 168(8.1) | ||
Age (years) | ||||
< 40 | 508(24.6) | 10(2.0) | 30(5.9) | |
40–49 | 861(41.7) | 17(2.0) | 69(8.0) | |
50–65 | 695(33.7) | 20(2.9) | 69(9.9) | |
P-values | 0.43 | 0.00 | ||
gender | ||||
Male | 1746(84.6) | 30(1.7) | 142(8.1) | |
female | 318(15.4) | 17(5.3) | 26(8.1) | |
P-values | 0.00 | 0.98 | ||
female | ||||
≤ 5 | 249(12.1) | 3(1.2) | 22(8.8) | |
6–15 | 555(26.9) | 5(0.9) | 52(9.4) | |
16–30 | 440(21.3) | 5(1.1) | 34(7.7) | |
>30 | 192(9.3) | 3(1.6) | 25(13.0) | |
N= | 628(30.4) | 31(4.9) | 35(5.6) | |
P-values | 0.90 | 0.21 | ||
Exposure Level | ||||
High | 465(22.5) | 38(8.2) | 44(9.5) | |
Low | 1003(48.6) | 9(0.9) | 92(9.2) | |
N= | 596(28.9) | 0(0) | 32(5.4) | |
P-values | 0.00 | 0.86 | ||
Smoking or not | ||||
Never | 523(25.3) | 4(0.8) | 47(9.0) | |
often | 819(39.7) | 13(1.6) | 69(8.4) | |
N= | 722(35.0) | 30(4.2) | 52(7.2) | |
P-values | 0.20 | 0.72 | ||
Pneumoconiosis or suspected pneumoconiosis | ||||
Yes | 41(2.0) | 1(2.4) | 7(17.1) | |
no | 2023(98.0) | 46(2.3) | 161(8.0) | |
P-values | 0.94 | 0.03 | ||