Table 3

Determinants of NO₂ personal exposure; multiple linear regression (n=61)

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	0.421	0.108	0.52	<0.001	0.631
C_W	0.342	0.124	0.21	<0.001	0.732
Time in transport	0.497	0.197	0.33	0.04	0.752

TWC†
TWC_H	0.728	0.093	0.53	<0.001	0.482
TWC_W	0.971	0.157	0.43	<0.001	0.633
Time in other indoor microenvironment	0.494	0.120	0.27	<0.001	0.680
TWC_T	0.652	0.188	0.24	<0.001	0.724
TWC_O	2.454	0.716	0.23	<0.001	0.781