Chronic effects of ambient air pollution on respiratory morbidities among Chinese children: a cross-sectional study in Hong Kong

Table 5 Adjusted odds ratios (ORs) of individual pollutants for respiratory conditions by gender after regrouping districts (significant or marginally significant only)

	Adjusted OR	*95% CI*	P
High PM ₁₀ ^a
*Boys*
Wheezing with shortness of breath	2.76	(1.07, 7.13)	0.036
Wheezing with medication	2.71	(1.20, 6.15)	0.017
Any wheezing	2.17	(1.09, 4.34)	0.028
Phlegm without colds	2.03	(1.19, 3.44)	0.009
Current asthma	2.03	(0.93, 4.45)	0.076
*Girls*
Cough at night	1.38	(0.96, 1.99)	0.083
Phlegm without colds	2.87	(1.56, 5.27)	0.001
High NO ₂ ^b
*Girls*
Cough at night	1.71	(1.18, 2.49)	0.005
Phlegm without colds	2.17	(1.08, 4.34)	0.029
Current allergic rhinitis	0.65	(0.47, 0.89)	0.008

^athe risk of high PM₁₀ was estimated by comparing high-pollution district (HPD) to the combination of low-pollution district (LPD) and moderate-pollution district (MPD);
^bthe risk of high NO₂ was estimated by comparing the combination of MPD and HPD to LPD;
Confounders adjusted were the same as those included in the models without regrouping districts.

ISSN: 1471-2458