Table 3.
Logistic regression analyses of respiratory symptoms in relation to dust exposure, overall and stratified by smoking status
| Respiratory symptom | INH (µg/m3) | RES (µg/m3) | ||
|---|---|---|---|---|
| Adjusted OR (95% CI)a | P | Adjusted OR (95% CI)a | P | |
| Overall | ||||
| Cough | 1.007 (0.986, 1.027) | 0.473 | 0.986 (0.935, 1.029) | 0.562 |
| Phlegm | 1.033 (1.012, 1.052) | 0.001 | 0.981 (0.922, 1.029) | 0.494 |
| Breathlessness | 0.996 (0.968, 1.021) | 0.773 | 0.925 (0.836, 0.997) | 0.082 |
| Wheeze | 1.005 (0.983, 1.025) | 0.664 | 0.969 (0.911, 1.017) | 0.262 |
| Smokers | ||||
| Cough | 1.004 (0.977, 1.030) | 0.752 | 1.015 (0.949, 1.078) | 0.644 |
| Phlegm | 1.031 (1.004, 1.058) | 0.021 | 0.976 (0.889, 1.051) | 0.559 |
| Breathlessness | 0.999 (0.961, 1.033) | 0.972 | 0.923 (0.793, 1.031) | 0.232 |
| Wheeze | 1.010 (0.981, 1.038) | 0.466 | 0.982 (0.898, 1.055) | 0.648 |
| Non-smokers | ||||
| Cough | 1.013 (0.978, 1.042) | 0.430 | 0.946 (0.841, 1.019) | 0.251 |
| Phlegm | 1.034 (1.002, 1.062) | 0.023 | 0.986 (0.901, 1.043) | 0.696 |
| Breathlessness | 0.993 (0.949, 1.029) | 0.729 | 0.925 (0.801, 1.013) | 0.199 |
| Wheeze | 0.997 (0.960, 1.028) | 0.845 | 0.961 (0.873, 1.022) | 0.311 |
OR odds ratio, CI confidence interval
aAdjusted for age (years), gender (female, male), occupation (manager, surface production, underground mining), shift length (10 h, 12 h) and additional adjustment for smoking status (yes, no) in overall models