Table 4

OR and 95% CI for multilevel logistic regression analysis of smoking and second-hand smoke exposure (SHS)

PredictorsCurrent smokers (reference: non-current smokers)Second-hand smoke exposure (reference: non-SHS)
OR (95% CI)OR (95% CI)
Individual variables
 Age0.98*** (0.97 to 0.99)0.98*** (0.97 to 0.99)
 Female sex (reference: male)0.002*** (0.001 to 0.004)0.90 (0.75 to 1.07)
 Educational level (reference: illiterate)
  Illiterate and primary (grades 1–6)0.94** (0.91 to 0.98)0.98 (0.95 to 1.00)
  Middle (grades 7–9) or higher0.95** (0.92 to 0.98)0.98 (0.95 to 1.00)
Tobacco cultivation (reference: yes)0.76* (0.57 to 0.99)0.76* (0.58 to 0.99)
Contextual variables
 Average yearly income (per 1000 yuan increase)0.66* (0.57 to 0.77)0.58* (0.52 to 0.65)
Measures of variation
 Township-level variance (SE)0.42 (0.078)0.31 (0.063)
 Individual-level variance (SE)5.3 (0.91)4.6 (0.74)
  • *p<0.05, **p<0.01, ***p<0.001.