Table 2.

Joint distribution of prenatal self-reported tobacco smoke exposure and serum cotinine concentration categories.

	No Self-Reported Exposure N=214 (%)	Self-Reported Secondhand Exposure N=42 (%)	Self-Reported Active Exposure N=36 (%)
Unexposed (<LOD)	108 (50)	5 (12)	1 (3)
SHS Exposure (LOD – 3ng/mL)	103 (48)	35 (83)	9 (25)
Active Exposure (> 3ng/mL)	3 (1)	2 (5)	26 (72)
Median Serum Cotinine Concentration (Min, Max)	0.015 (<LOD, 14.9)	0.134 (<LOD, 3.92)	35.3 (<LOD, 355.5)

^*-Limited to women with complete covariate data.