Modeling personal particle-bound polycyclic aromatic hydrocarbon (pb-pah) exposure in human subjects in Southern California

Table 5 Regression model for square root of average PB-PAH exposures of each subject in major time-activity categories (indoor, in-vehicle, and other) across all the sampling sessions (N = 74 ^a ; R ² = 0.76; adjusted R ² = 0.75)

	Beta	Standard error	p-value	Partial R²	VIF
Intercept	1.29	1.18	0.2776		0
GPS speed (sqrt)	0.82	0.11	<.0001	0.67	1.62
Indoor (yes/no)	−1.75	0.58	0.0039	0.07	1.72
Percent of daytime	3.87	1.48	0.0108	0.02	1.65

^aWe excluded 6 records that lasted for less than 60 min in total for a particular time-activity category (i.e. indoor, in-vehicle travel, and other).

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