Relative risks of active tuberculosis(TB) and culture-confirmed TB between current smokers and other silicotic patients
| Current smokers versus other# | RR (95% CI) | |
| Active TB | Culture-confirmed TB | |
| Crude rates | 1.92 (1.18–3.12) | 1.94 (1.07–3.52) |
| Excluding regular drinkers | 1.96 (1.18–3.27) | 1.98 (1.07–3.68) |
| Stratified by TT/treatment¶ | 1.87 (1.13–3.08) | 1.90 (1.02–3.53) |
RR: relative risk; CI: confidence interval; TT: tuberculin status. #: includes both ex-smokers and never-smokers; ¶: Mantel–Haenszel analysis after stratification into three groups: tuberculin-negative, tuberculin-positive with latent TB infection treatment and tuberculin-positive without treatment.