2.5.1. Analyses, Smoking Families vs. Nonsmoking Families (Study 1 vs. Study 2)
We compared child TSE (above the LOD: yes vs. no) between non-smoking and smoking families using a chi-squared test. We used a linear model to compare child exposure between non-smoking and smoking families as measured by log-hair nicotine (LHN) while controlling for laboratory batch. Because of the small number of participants in the non-smoking family cohort, we did not perform multivariable analyses. 