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. Author manuscript; available in PMC: 2015 Nov 3.
Published in final edited form as: Environ Sci Process Impacts. 2014 Feb;16(2):239–246. doi: 10.1039/c3em00357d

Table 1.

Selected best model of annual mean PM2.5 concentration (μg m−3) for health impact assessmenta

Model Unit β 95% CI p-values VIF η2 (%)
Constant 8.097 6.427, 9.767 <0.001
ln A 0–1 0.613 0.367, 0.859 <0.001 1.5 43.8
In V km −0.987 −1.587, −0.388 0.002 1.3 25.4
C 0–50 −0.048 −0.095, −0.001 0.045 1.7 11.7
W km h−1 −0.037 −0.075, 0.002 0.063 1.1 10.1
L °C −0.020 −0.049, 0.009 0.165 1.8 5.7
cc okta −0.068 −0.233, 0.097 0.406 1.4 2.1
a

Note: A = aerosol optical thickness, V = visibility, C = cloud optical thickness, W = wind speed, L = land surface temperature, and cc = cloud cover. VIF = variance inflation factor, in which VIF less than 2.5 is indicative of non-collinearity. η2 = partial eta square, which indicates the percentage variance explained by the variable in the model. Model selection (see M8 in Suppl 2, ESI).