Table 3.

Simple logistic regression analyses for the association of being in a cluster by phenotype of lower respiratory illness and exposure concentration of air pollutant (μg/m³) in the census tract (per interquartile range of air pollutant).

Pollutant	Wheezing LRI Cluster		Viral LRI Cluster		RSV LRI Cluster
	OR	P	OR	P	OR	P
Acetaldehyde	1.45	0.004	1.02	0.91	0.76	0.12
Acrolein	1.15	0.0	1.04	0.09	1.19	0.28
Arsenic	1.22	0.35	0.76	0.26	1.09	0.41
Benzene	1.51	0.09	0.96	0.85	2.08	0.001*
Butadiene	1.33	0.17	1.45	0.0	2.05	<0.001*
Chromium	1.41	<0.001*	0.98	0.86	0.79	0.07
Diesel PM	1.41	<0.001*	1.10	0.19	0.89	0.32
Formaldehyde	1.29	0.01	0.12	0.22	0.96	0.73
Lead	1.08	<0.001*	1.08	0.002	0.81	0.003
Manganese	1.49	0.11	0.95	0.79	2.22	<0.001*
Mercury	1.31	0.02	1.30	0.008	1.56	<0.001*
Nickel	1.62	<0.001*	1.07	0.56	1.02	0.85
POM	1.46	0.14	0.94	0.77	2.28	<0.001*
Cadmium	1.28	0.36	0.86	0.39	1.13	0.32
Beryllium	1.23	0.04	1.12	0.23	1.53	<0.001*
Trichloroethylene	1.57	0.002	1.34	0.02	1.47	0.002
Perchloroethylene	1.72	0.008	1.25	0.18	1.96	<0.001*
Ethylene dichloride	1.43	0.10	1.17	0.40	1.05	0.80
Chloroform	1.63	0.03	1.35	0.13	1.31	0.16
Methylene chloride	1.64	0.006	1.35	0.05	1.77	<0.001*
1,2-dichloropropene	1.51	0.10	0.96	0.86	2.17	<0.001*
Ethylene oxide	1.23	0.08	1.27	0.04	1.61	<0.001*
Quinolone	1.19	<0.001*	1.04	0.41	0.91	0.20
Hydrazine	1.12	<0.001*	1.05	0.10	0.93	0.17

Note. PM=particulate matter; POM= polycyclic organic matter; CI = confidence interval; OR = odds ratio;

^*indicates significance after Bonferroni correction (p<0.002 for air pollutants).