Table 2. Comparison between subjects with or without prior pulmonary tuberculosis.
| Prior pulmonary tuberculosis (-) n = 14,145 (94.5%) | Prior pulmonary tuberculosis (+) n = 822 (5.5%) | p value | |
|---|---|---|---|
| Age (years) | 56.9 ± 10.9 | 59.5 ± 10.9 | < 0.001 |
| Male sex | 6,048 (42.8%) | 438 (53.3%) | < 0.001 |
| Smoking status | < 0.001 | ||
| Current smoker | 2,679 (19.0%) | 149 (18.2%) | |
| Ex-smoker | 3,039 (21.5%) | 253 (30.9%) | |
| Nonsmoker | 8,405 (59.5%) | 418 (51.0%) | |
| Smoking status (pack-year) | 9.45 ± 16.81 | 11.95 ± 18.61 | < 0.001 |
| Asthma* | 438 (3.1%) | 57 (6.9%) | |
| Pulmonary function tests* | < 0.001 | ||
| FVC % | 92.4 ± 12.0 | 88.4 ± 13.5 | < 0.001 |
| FVC (liters) | 3.4 ± 0.9 | 3.4 ± 1.0 | < 0.001 |
| FEV1% | 92.6 ± 13.5 | 84.9 ± 17.2 | |
| FEV1 (liters) | 2.7 ± 0.7 | 2.5 ± 0.7 | < 0.001 |
| FEV1/FVC % | 77.9 ± 7.5 | 73.4 ± 10.2 | < 0.001 |
| FEV6 (liters) | 3.3 ± 0.8 | 3.2 ± 0.9 | < 0.001 |
| FEF25-75% (liters/sec) | 3.7 ± 2.1 | 3.1 ± 2.1 | < 0.001 |
| PEF (liters/sec) | 7.1 ± 1.9 | 6.6 ± 2.1 | < 0.001 |
| COPD* | 1,739 (12.3%) | 239 (29.1%) | < 0.001 |
| Mild | 820 (5.8%) | 79 (9.6%) | < 0.001 |
| Moderate | 847 (6.0%) | 131 (15.9%) | < 0.001 |
| Severe | 67 (0.5%) | 23 (2.8%) | < 0.001 |
| Very severe | 5 (0.04%) | 6 (0.7%) | < 0.001 |
Data are means ± SD or percentages.
FVC: forced vital capacity; FEV1: forced expiratory volume in 1 second; FEV6: forced expiratory volume in 6 seconds; FEF25-75%: forced expiratory flow 25–75%; PEF: peak expiratory flow; COPD: chronic obstructive pulmonary disease.
* p values were adjusted for age, sex, and smoking status.