Table 2 Multivariable linear model comparing smoking status of mothers and fathers.

Covariate	Ratio of geometric means	95% CI	p Value
Maternal smoking in household	3.97	2.28 to 6.92	<0.001
Paternal smoking in household	1.83	1.05 to 3.18	0.034

Dependent variable: log cotinine:creatinine ratio.