2.5.2. TSE by Location of Home Smoking and Other Explanatory Variables (Study 1)
CPD
REGRESSION
We first assessed TSE by location of home smoking using the LOD (dichotomous outcome: exposed vs. not exposed) using a chi-squared test. We also tested the bivariate relationship between above-LOD exposure and each of the following variables: number of parental smokers (both or one), child sex, parental nationality, maternal education, paternal education, and income, using chi-squared tests, and child age, parental combined cigarettes per day (CPD), and neighborhood SES, using t-tests. Next, we conducted an adjusted logistic regression analysis to examine whether TSE differed by location of smoking and to identify any correlates that were associated with TSE while controlling for batch. Finally, we ran parallel analyses to those above using the continuous outcome (log hair nicotine) using a multivariable linear model while controlling for batch. We also performed a sensitivity analysis using Tobit regression. 