Table 6.

Results of linear mixed-effect models for personal exposure to dry-cleaning and Industrial-related VOCs.

Variable	Group/unit	TCE		PERC		CTC
		β	SE	β	SE	β	SE
Intercept		0.79	0.42	−0.48	0.49	0.64	0.23
Visit	1	0.18	0.07	0.19	0.10	−0.01	0.03
	2	Reference		Reference		Reference
City	Los Angeles	0.66	0.14	0.58	0.18	0.17	0.07
	Elizabeth	1.23	0.14	0.54	0.24	−0.11	0.07
	Houston	Reference		Reference		Reference
Ambient relative humidity	%			0.01	0.01
Ethnicity	White			−0.12	0.19
	Mexican			0.48	0.23
	Hispanic			0.06	0.24
	Other			Reference
Having a fireplace	No					0.13	0.07
Indoor temperature	°C	0.03	0.01			0.01	0.01
Inverse wind speed	knot⁻¹			4.87	0.83
Log-transformed AER	h⁻¹			0.20	0.07
Not using fresheners or candles	No					0.20	0.08
Restaurants or bakery in neighborhood	No	0.26	0.13
Source of household water	Public	0.58	0.27			0.50	0.14
Sweeping indoors	No			0.19	0.12
Time spent at closed cars	min	0.0018	0.0005
Unemployed	No			0.42	0.13
Using air cleaning devices	No					0.19	0.08
Vinyl, asbestos or other siding	No	0.25	0.13
Visited dry cleaners during past week	No			0.63	0.15

n = 400 to 446 depending on models.

AER, air exchange rate; TCE, trichloroethylene; PERC, tetrachloroethene; CTC, carbon tetrachloride.

For dichotomous variables, the reference group is “Yes”.

p-Value < 0.05 shown in bold type.