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. Author manuscript; available in PMC: 2014 Apr 7.
Published in final edited form as: J Expo Sci Environ Epidemiol. 2013 Jan 16;23(3):299–305. doi: 10.1038/jes.2012.123

Table 5.

Multivariate analysis of outdoor log-transformed PM10, PM2.5, and endotoxin concentrations by major predictors

Variable PM10μg m−3 PM2.5 μg m−3 Endotoxin EU m−3
β p β p β p
Intercept 1.987 <0.001 0.821 <0.001 1.049 0.002
Wind speed (m s−1) −0.041 <0.001 −0.038 0.004 0.070 0.032
Precipitation (1 cm) NS NS NS
Relative humidity (%) −0.008 <0.001 0.003 0.035 −0.017 <0.001
Season 0.030 0.004 <0.001
Winter 0.119 0.004 0.219 <0.001 Reference
Spring 0.040 0.305 0.179 <0.001 0.139 0.185
Summer 0.008 0.802 0.030 0.435 0.528 <0.001
Autumn Reference Reference 0.780 <0.001
Agricultural household 0.073 0.019 NS NS
Home located on un-paved road NS NS NS
Grain storage bins on property NS NS NS
Cattle or swine raised on property NS NS NS
Swine confinement on property NS NS NS

NS variable’s overall p > 0.05