Table 6.

Predicted House-Dust Nicotine Concentrations (ng/g) for Various Combinations of Self-reported Smoking and Parental Demographics,^a Northern California Childhood Leukemia Study, 1999–2007

Description of Self-reported Smoking	Parental Demographics
	Younger and Lower SESb	Median Age and Median SESc	Older and Higher SESd
No smoking by anyone at any time	210	130	90
Only the mother smoked—stopped at least 3 months before conceptione	230	130	90
Only the father smoked—stopped at least 3 months before conceptione	210	160	130
Both the mother and father smoked—stopped at least 3 months before conceptione	230	170	130
No parental smoking at any time; only others smoked in the home before and after birthe	400	330	280
Only the mother smoked at all time periodsf	1,000	230	70
Only the father smoked at all time periodsf	230	370	530
Both the mother and father smoked at all time periodsf	1,100	650	420
Both the mother and father smoked at all time periodsf and in-home smoking reported at dust collectionf	1,300	800	540
Both the mother and father smoked at all time periodsf and others smoked before and after birthe	2,200	1,700	1,300
Both the mother and father smoked at all time periodsf and others smoked before and after birthe and in-home smoking reported at dust collectionf	2,500	2,000	1,700

Abbreviation: SES, socioeconomic status.

^aPredicted values based on the “All Homes” model, assuming a 10-year-old single-family house, measurement season is not fall, no breastfeeding, child is white or Hispanic, and usual vacuum frequency of less than once a month.

^b25th percentile values: mother's age (years) = 26, father's age (years) = 28, household annual income = $30,000–$44,000, parents have high school degrees.

^cMedian values: mother's age (years) = 30, father's age = 33, household annual income = $60,000–$74,000, parents have some post–high school education.

^d75th percentile values: mother's age (years) = 34, father's age (years) = 37, household annual income = ≥$75,000, parents have bachelor's degrees.

^eDichotomous (yes/no) smoking variable.

^fContinuous smoking variable, showing model predictions for smoking 5 cigarettes per day.