Table 1.

Characteristics of subjects by any parent ETS exposure status

	Any Parent ETS Exposure
	Yes (n=229)	No (n=183)	p value*
Age at enrollment: mean (SD)	8.5 (4.5)	7.9 (4.7)	0.216
Sex: % male	51.1	50.8	0.957
Parent years of formal education:
% with >12 years
Mothers (n=403)	33.9	56.0	<0.001
Fathers (n=360)	41.8	59.0	0.001
Asthma in childhood: %	19.2	14.2	0.179
Cough in childhood: %	41.1	34.4	0.169
Chronic cough in childhood: %	18.8	13.1	0.121
Wheeze in childhood: %	49.3	44.8	0.360
Personal smoking in adulthood
Ever (n=178): %	53.3	30.6	<0.001
Never (n=234): %	46.7	69.4
Pack years (among ever smokers, n=176): mean (SD)	7.9 (6.7)	4.8 (5.6)	0.003

n is 412 unless otherwise specified

^*p value for the comparison between the two groups