TABLE 2.

a. Pearson Correlation Coefficientsa of Exposuresb among Hispanic Controls Born between 1997 and 2006 in Eight Counties in the San Joaquin Valley of California (N = 466)
	CO	NO	NO2	PM10	PM2.5
Carbon monoxide (CO)	1
Nitrogen oxide (NO)	0.80	1
Nitrogen dioxide (NO2)	0.77	0.74	1
Particulate matter <10 µm(PM10)	0.43	0.26	0.57	1
Particulate matter <2.5 µm(PM2.5)	0.82	0.74	0.63	0.57	1

b. Percentage of Concordance between Neighborhood Factors among Hispanic Controls Born between 1997 and 2006 in Eight Counties in the San Joaquin Valley of California (N = 466)
	High Spanish primary language	Low U.S. citizens	Recent year of entry	High Hispanic population	High foreign-born	Low English proficiency	Low acculturation indexa
High Spanish primary language	1
Low U.S. citizens	0.69	1
Recent year of entry	0.63	0.73	1
High Hispanic population	0.84	0.70	0.64	1
High foreign-born	0.74	0.75	0.66	0.82	1
Low English proficiency	0.63	0.72	0.68	0.71	0.80	1
Low acculturation indexa	0.76	0.79	0.70	0.85	0.90	0.83	1

^aAll p-values < 0.0001.

^bPollutant levels are based on 24-hr average measurements.

All chi-square p-values < 0.0001.

^aIndex created using principal component analysis of all factors.