Odds ratios for associations of potentially confounding variables with prevalence of current respiratory/allergic symptoms.

Data shown as odds ratio (OR) for unit increase in variable unless otherwise stated, with 95% confidence intervals in brackets; ORs adjusted for all variables shown in table; ETS exposure = positive urinary cotinine:creatinine ratio (CCR ≥ 30ng/mg); * p<0.05 **p<0.01 Odds ratios for associations of potentially confounding variables with prevalence of current respiratory/allergic symptoms.