Table 1. Selected characteristics for participants in Taiwan Children Health Study.

	With genotyping		All eligible participants
	(N = 3577)		(N = 5082)
	N	%	N	%
Demographic information
Sex
Boy	1755	49.1	2464	48.5
Girl	1822	50.9	2618	51.5
Age, yr (Mean ± SD)	12.26±0.50		12.42±0.65
Parental asthma†
No	3335	96.9	4739	97.1
Yes	108	3.1	140	2.9
Parental atopy†
No	2536	73.7	3617	74.1
Yes	907	26.3	1262	25.9
Home exposures †
Carpet use	308	8.7	442	8.7
In utero exposures to maternal smoking	142	4.0	198	3.9
ETS at home	1544	43.4	2265	44.9
Respiratory Outcomes †
Asthma	284	8.0	375	7.4
Wheeze	431	12.1	586	11.6
Early-onset asthma‡	184	5.3	239	4.9
Late-onset asthma§	92	2.7	123	2.6

^†Number of subjects do not add up to total N because of missing data.

^‡Early-onset: asthma diagnosed ≦5 yr of age.

^§Late-onset: asthma diagnosed >5 yr of age.