Table 2

Determinants of PM_2.5 personal exposure; multiple linear regression (n=53)

Independent variable	Reg coeff	Std err	Std reg coeff	p	R²‡
*C_H, in-home concentration; C_W, in-workplace concentration; C_O, background outdoor concentration.
†TWC_H, time weighted average concentration in home; TWC_W, time weighted average concentration in workplace; TWC_T, time weighted average concentration in transport; TWC_O, time weighted average concentration outdoors.
‡R² from the stepwise regression model.
Concentration*
C_H	0.701	0.069	0.67	<0.001	0.553
C_W	0.173	0.024	0.45	<0.001	0.781
C_O	0.278	0.115	0.17	0.02	0.804

TWC†
TWC_H	1.205	0.103	0.66	<0.001	0.450
TWC_W	0.607	0.088	0.40	<0.001	0.686
Time in other indoor microenvironment	0.949	0.161	0.34	<0.001	0.793
TWC_T	1.791	0.450	0.23	<0.001	0.840
TWC_O	4.815	2.100	0.13	0.03	0.856