Adjusted hazard ratios(HR) of active tuberculosis (TB) and culture-confirmed TB with respect to smoking-related variables
| Factors | HR# (95% CI) | |||
| Active TB | p-value | Culture-confirmed TB | p-value | |
| Current smokers versus other | 1.96 (1.14–3.35) | 0.015 | 2.13 (1.12–4.06) | 0.021 |
| Number currently smoked per day | 0.011 | 0.002 | ||
| <10 | 1.00 (Ref.) | 1.00 (Ref.) | ||
| 10−<20 | 1.89 (1.04–3.43) | 2.46 (1.19–5.05) | ||
| ≥20 | 2.54 (1.28–5.03) | 3.65 (1.63–8.16) | ||
| Cigarette pack-yrs | 0.134 | 0.320 | ||
| <20 | 1.00 (Ref.) | 1.00 (Ref.) | ||
| 20−<40 | 1.29 (0.75–2.23) | 1.19 (0.61–2.31) | ||
| ≥40 | 1.96 (1.01–3.79) | 1.83 (0.84–4.03) | ||
CI: confidence interval; Ref.: reference. #: adjusted for age, past/current regular alcohol use, body mass index, presence of other comorbidities, bacille Calmette–Guérin scar, tuberculin status/treatment of latent TB infection, principal job type, duration of silica dust exposure, profusion, size and shape of lung nodules, and progressive massive fibrosis.