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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 6.

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

Variable PM10 μg m−3 PM2.5 μg m−3 Endotoxin EU m−3
β P β P β P
Intercept 0.853 <0.001 0.364 0.051 −1.010 <0.001
Indoor relative humidity (%) 0.004 0.003 0.009 <0.001 NS
Indoor CO2 concentration (ppm) NS NS NS
Log outdoor PM10 0.296 0.007
Log outdoor PM2.5 0.667 0.003
Log outdoor endotoxin 0.282 <0.001
Home cleanliness 0.016 NS 0.001
 Low 0.134 0.006 0.311 <0.001
 Medium 0.090 0.034 0.198 0.016
 High Reference Reference
Indoor dog and/or cat NS NS NS
Smoking inside home 0.203 0.002 0.273 <0.001 −0.300 0.035
Gas stove NS NS NS
Gas furnace NS 0.105 0.021 NS
No central air conditioning NS 0.145 0.003 NS
Season NS 0.008 NS
 Winter 0.104 0.174
 Spring 0.208 <0.001
 Summer 0.060 0.267
 Autumn Reference
Agricultural household NS NS NS
Home located on un-paved road NS NS NS
Grain storage bins on property NS NS 0.201 0.006
Non-confined cattle or swine raised on property NS NS NS
Swine confinement on property NS NS NS

NS variable’s overall p > 0.05; — variable not included in analysis