Table 4.
The crosstab of cotinine level and self-reported smoking for LTBI status.
| Cotinine (ng/mL) | Never Smoking n (LTBI%) |
Smoker n (LTBI%) |
Quitter n (LTBI%) |
Total |
|---|---|---|---|---|
| <1 | 4313 (6.2%) | 26 (11.5%) | 933 (13.1%) | 5272 (7.4%) |
| ≥1 and <10 | 277 (2.2%) | 39 (17.9%) | 56 (8.9%) | 372 (4.8%) |
| ≥10 | 239 (4.6%) | 899 (9.6%) | 116 (6.0%) | 1254 (8.3%) |
| Total | 4829 (5.9%) | 964 (10.0%) | 1105 (12.1%) | 6898 (7.5%) |
For the quitters, they had a much higher LTBI than never smoking and current smokers. Even if they stopped smoking, the risk of LTBI seemed not to be reverted.