Table 4. Predictors for pneumonia hospitalization among children that were found to be statistically significant through multiple linear regression.

Variables	Coefficients	Standard error	t	P
Period of the year	0.182	0.039	4.634	< 0.001
PM2.5 µg/m3	0.009	0.002	3.933	< 0.001
RH (%)	-0.008	0.002	-4.152	< 0.001

CO (carbon monoxide): adjustment variable.

PM_2.5 = particulate matter; RH = relative air humidity.