Table 3 Prevalence rate of workers exposed to silicon dust at different levels
Project | Exposure level of silica dust | p-values | |||
|---|---|---|---|---|---|
High (465) | Low (1003) | ||||
n | FEV1/FVC < 70% | n | FEV1/FVC < 70% | ||
Age (years) | |||||
< 40 | 99(21.3) | 10(10.1) | 266(26.5) | 0(0) | 0.00 |
40–49 | 205(44.1) | 13(6.3) | 405(40.4) | 4(1.0) | 0.00 |
50–65 | 161(34.6) | 15(9.3) | 332(33.1) | 5(1.5) | 0.00 |
p-values | 0.43 | 0.15 | |||
seniority(years) | |||||
≤ 5 | 68(14.6) | 0(0) | 171(17.0) | 3(1.8) | 0.27 |
6–15 | 194(41.7) | 4(2.1) | 371(37.0) | 1(0.3) | 0.03 |
16–30 | 146(31.4) | 3(2.1) | 294(29.3) | 2(0.7) | 0.20 |
>30 | 27(5.8) | 2(7.4) | 165(16.5) | 1(0.6) | 0.01 |
N= | 30(6.5) | 29(96.7) | 2 | 2(100.0) | |
p-values | 0.15 | 0.29 | |||
Smoking or not | |||||
Never | 114(24.5) | 9(7.9) | 346(58.9) | 4(1.2) | 0.00 |
often | 250(53.8) | 4(1.6) | 495(41.1) | 0(0) | 0.00 |
N= | 101(21.7) | 25(24.8) | 162 | 5(3.1) | |
p-values | 0.00 | 0.02 | |||
Pneumoconiosis or suspected pneumoconiosis | |||||
yes | 30(6.5) | 1(3.3) | 11(1.1) | 0(0) | 0.54 |
no | 435(93.5) | 37(8.5) | 992(99.0) | 9(0.9) | 0.00 |
P-values | 0.32 | 0.75 | |||