Table 1 Demographic characteristics and environmental tobacco smoke (ETS) exposure of the study participants

From: Household environmental tobacco smoke and risks of asthma, wheeze and bronchitic symptoms among children in Taiwan

	Total		Boys		Girls
	(n = 5019)		(n = 2432)		(n = 2587)
	n	%	n	%	n	%
Age, yr
12	3467	69.1	1696	69.7	1771	68.5
13	1234	24.6	577	23.7	657	25.4
14	318	6.3	159	6.5	159	6.1
Parental education, yr†
≦ 12	3163	63.5	1509	62.7	1654	64.3
13~15	949	19.1	460	19.1	489	19.0
≧ 16	867	17.4	437	18.2	430	16.7
Gestational age†
Full term	4435	90.7	2113	89.6	2322	91.6
<4 wk early	315	6.4	173	7.3	142	5.6
≧ 4 wk early	142	2.9	71	3.0	71	2.8
Family history of asthma†
Yes	140	3.1	68	3.1	72	3.1
Family history of atopy*†
Yes	1257	25.0	641	25.0	643	25.0
Family income**†
≦ 400,000	1750	37.7	792	35.4	958	39.8
410,000~800,000	1833	39.5	911	40.7	922	38.3
≧ 810,000	1060	22.8	534	23.9	526	21.9
Active smoking
Yes	37	0.7	28	1.2	9	0.3
In utero exposure†
Yes	197	3.9	82	3.4	115	4.5
Lifetime ETS†
Yes	2445	49.0	1176	48.7	1269	49.4
Currently ETS†
Yes	2241	44.9	1078	44.6	1163	45.3
Previous ETS only†
Yes	204	4.1	98	4.1	106	4.1
Currently amount of ETS***†
0	2778	55.8	1354	56.2	1424	55.4
≦ 10	1728	34.7	838	34.8	890	34.6
> 10	472	9.5	217	9.0	255	9.9
Percent of ETS****†
0	2778	55.8	1354	56.3	1424	55.4
≦ 20%	1406	28.3	693	28.8	713	27.7
> 20%	791	15.9	358	14.9	433	16.8
Dad smoking†
Yes	1794	36.0	835	34.6	959	37.2
Mom smoking†
Yes	171	3.4	69	2.9	102	4.0
Number of smokers†
0	2723	54.8	1368	56.8	1355	53.0
1	1476	29.7	695	28.9	781	30.5
2	513	10.3	238	9.9	275	10.8
≧ 3	253	5.1	106	4.4	147	5.7

*Atopy is defined as allergic rhinitis or atopic eczema.
**New Taiwan dollars per year ($1 US = $ 33 New Taiwan).
***Average cigarettes per day
****Average percent of ETS in lifetime
† Number of subjects does not add up to total N because of missing data.

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