Table 2.

Adjusted odds ratios for ETS exposure by relevant participant characteristics [OR (95% CI)].

	Overall ETS	Social ETS	Home ETS	Work ETS a
Later time period	0.62 (0.53, 0.73)*	0.69 (0.61, 0.78)*	0.65 (0.51, 0.83)*	1.15 (0.77, 1.72)
Age (per 5 years)	0.87 (0.81, 0.94)*	0.24 (0.18, 0.31)*	0.62 (0.34, 1.13)	0.23 (0.07, 0.77)*
Female sex	0.41 (0.33, 0.51)*	0.52 (0.44, 0.62)*	0.71 (0.48, 1.05)	0.18 (0.11, 0.29)*
College (vs. < h.s.)	0.25 (0.16, 0.37)*	0.57 (0.42, 0.77)*	0.40 (0.19, 0.87)*	0.20 (0.09, 0.45)*
Some college (vs. < h.s.)	0.65 (0.46, 0.92)*	0.85 (0.63, 1.15)	1.32 (0.71, 2.44)	0.46 (0.21, 0.98)*
High school (vs. < h.s.)	0.53 (0.40, 0.71)*	0.95 (0.74, 1.22)	0.78 (0.44, 1.37)	0.52 (0.26, 1.05)
Currently working	1.44 (1.14, 1.83)*	---	---	---
Lives with others (per each)	1.12 (0.99, 1.26)	---	1.53 (1.08, 2.18)*	---

h.s. = high school; ETS = environmental tobacco smoke; GEE = generalized estimating equations; OR = odds ratio; CI = confidence interval (a) Analysis for work ETS was restricted to those working part- or full-time at both time points (n=350).

^*p < 0.05