Table 1.

Clinical characteristics of the study participants and univariate analysis of the risk of asthma.

Characteristics		Total		Ever Asthma
		N = 6000		Yes (n = 833)		No (n = 5167)
		n	%	n	%	n	%
Age:	3–4 y	3110	51.8	391	46.9	2719	52.6
	5–6 y	2890	48.2	442	53.1	2448	47.4
Sex: male		3060	51	502	60.3	2558	49.5
female		2940	49	331	39.7	2609	50.5
Race: Mexican-American		1581	26.3	135	16.2	1446	28
	Other-Hispanic	497	8.3	85	10.2	412	8
	Non-Hispanic White	1772	29.5	204	24.5	1568	30.3
	Non-Hispanic Black	1600	26.7	322	38.7	1278	24.7
	Other/Multiracial	550	9.2	87	10.4	463	9
Poverty-to-income ratio:	<1.85	3710	61.8	537	64.5	3173	61.4
	≥1.85	2290	38.2	296	35.5	1994	38.6
Maternal smoking: yes		768	12.8	134	16.1	634	12.3
no		5232	87.2	699	83.9	4533	87.7
Insurance coverage: yes		5389	89.8	778	93.4	4611	89.2
no		611	10.2	55	6.6	556	10.8
Low birth rate: yes		590	9.8	124	14.9	466	9
no		5410	90.2	709	85.1	4701	91
Maternal age: ≥35 y		1291	21.5	180	21.6	1111	21.5
<35 y		4709	78.5	653	78.4	4056	78.5
Household smoking:		949	15.8	152	18.2	797	15.4
Survey Cycle	1999–2000	593	9.9	96	11.5	497	9.6
	2001–2002	745	12.4	96	11.5	649	12.6
	2003–2004	716	11.9	100	12	616	11.9
	2005–2006	831	13.9	114	13.7	717	13.9
	2007–2008	720	12	103	12.4	617	11.9
	2009–2010	751	12.5	101	12.1	650	12.6
	2011–2012	818	13.6	117	14.1	701	13.6
	2013–2014	826	13.8	106	12.7	720	13.9