Association between exposure to traffic-related air pollution and pediatric allergic diseases based on modeled air pollution concentrations and traffic measures in Seoul, Korea: a comparative analysis

Table 1 Individual characteristics of 14,614 children in the Seoul Atopy Friendly School Project Survey in Seoul, Korea, for 2010

Variable	Level	Total N	%	Prevalence^a
Variable	Level	Total N	%	Eczema	%	Asthma	%	Rhinitis	%
		14,614	100	2323	15.9	1171	8.0	5286	36.2
Sex	Male	7337	49.8	1140	15.5	711	9.7	2966	40.4
Sex	Female	7277	50.2	1183	16.3	460	6.3	2320	31.9
Age (year)	1–3	1293	8.8	218	16.9	231	17.9	362	28.0
	4–6	2389	16.3	439	18.4	267	11.2	879	36.8
	7–9	5404	37.0	888	16.4	378	7.0	2061	38.1
	10–12	5528	37.8	778	14.1	295	5.3	1984	35.9
BMI	Underweight	2029	13.9	284	14.0	166	8.2	835	41.2
	Normal	11,826	80.9	1920	16.2	918	7.8	4170	35.3
	Obese	759	5.2	119	15.7	87	11.5	281	37.0
Breast feeding (month)	≤3	7975	54.6	1110	13.9	590	7.4	2950	37.0
	4–11	3836	26.2	630	16.4	317	8.3	1329	34.6
	≥12	2803	19.2	583	20.8	264	9.4	1007	35.9
Household income	Low	2638	18.1	471	17.9	226	8.6	832	31.5
	Middle	6467	44.3	1086	16.8	526	8.1	2343	36.2
	High	5509	37.7	766	13.9	419	7.6	2111	38.3
Regional income	Low	5036	34.5	760	15.1	306	6.1	1928	38.3
	Middle	6903	47.2	1101	15.9	618	9.0	2470	35.8
	High	2675	18.3	462	17.3	247	9.2	888	33.2

ISSN: 1476-069X