Cox proportional hazards analysis of secondhand smoke exposure, other covariates, and active tuberculosis.

*Adjusted for age, survey year, sex, education, marital status, residing in a crowded home, alcohol use, employment status, and household income. **Others: Divorced/separated/widowed/other. ***Fewer than eight persons per household, or more than or equal to eight persons per household. ****Never-not current users of alcohol; social-less than once a week; regular-once a week or more and not to the extent of being intoxicated; heavy-once a week or more and to the extent of being intoxicated.