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Table 3 Regression model for square root of daily average PB-PAH exposures by subject (N = 180)

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

  General linear regression Mixed effect model (fixed effects)
Variable Beta Standard error p-value Partial R2 VIF Beta Standard error p-value
Intercept 1.54 0.15 <.0001   0 1.55 0.18 <.0001
Percent of in-vehicle travel time 16.90 1.20 <.0001 0.48 1.01 17.40 1.10 <.0001
Length-weighted AADT within 500 m 1.02*10-5 2.10*10-6 <.0001 0.08 1.05 0.94*10-5 3.07*10-6 0.0027
Had work-related exposure to traffic pollutants (yes/no)a 0.41 0.15 0.0080 0.02 1.05 0.57 0.27 0.0378
Weekday (1/0) 0.33 0.14 0.0192 0.01 1.01 0.31 0.13 0.0173
  1. aWork-related exposure includes working around parking garage, kiosk, auto shop, buses, trucks, or heavy traffic, or driving a car/bus/truck during the work.