Cohort characteristics (n=370)*
| At baseline | TB (n=185) | No TB (n=185) | Difference (95% CI) in means or OR (TB vs no TB) |
| Silicosis | |||
| Present | 18.4% | 10.8% | OR 1.86 (1.03 to 3.37) |
| At follow-up | |||
| Age (years) | |||
| Mean (SD) | 44.0 (6.4) | 43.9 (6.4) | 0.1 |
| Median (IQR) | 44.2 (10.4) | 44.0 (9.9) | (−1.2 to 1.4) |
| Employment (years) | |||
| Mean (SD) | 22.7 (7.4) | 22.3 (7.7) | 0.4 |
| Median (IQR) | 23.5 (12.8) | 23.4 (11.3) | (−1.2 to 1.9) |
| Duration from baseline (years) | |||
| Mean (SD) | 4.5 (0.5) | 4.7 (0.5) | −0.2 |
| Median (IQR) | 4.6 (1.0) | 4.8 (1.0) | (−0.3 to −0.1) |
| History of bronchitis | |||
| Present | 1.6% | 1.0% | OR 1.51 (0.25 to 9.13) |
| History of asthma | |||
| Present | 8.6% | 2.7% | OR 3.41 (1.22 to 9.51) |
| History of pneumonia | |||
| Present | 6.4% | 4.8% | OR 1.36 (0.56 to 3.30) |
| Smoking history | |||
| Never or past | 52.4% | 69.2% | 1.00 |
| Current | 47.5% | 30.8% | OR 2.04 (1.33 to 3.12) |
↵* Median (IQR) included if variable is non-normally distributed.
TB, tuberculosis.