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. Author manuscript; available in PMC: 2014 May 28.
Published in final edited form as: J Expo Sci Environ Epidemiol. 2008 Oct 8;19(5):525–533. doi: 10.1038/jes.2008.46

Table 4.

Regression coefficients for various traffic counts controlled by wind speed (n=12)a.

Variable Slope for traffic counts (SE) P-value Slope for wind speed (SE) P-value
All vehicles 0.018 (0.06) 0.78 −3.28 (1.52) 0.06
Diesel-powered vehicles 0.15 (0.68) 0.83 −3.44 (1.38) 0.04
Non-diesel-powered vehicles 0.019 (0.07) 0.78 −3.28 (1.53) 0.06
a

Note: a multiple linear regression was used to predict the elevated average PM2.5 (μg/m3) during the recording time. Traffic counts and wind speed are two independent predictors.