Table 3 The relationship between household smoking restrictions and second-hand smoke (SHS) exposure

Household smoking restriction	Household smoking restriction, % (no. of subjects)	Household SHS rate (%)	χ² Test	p Value
Smoking not allowed in ANY indoor areas	6.3% (496)	20.0	93.0	<0.001
Smoking allowed in SOME indoor places	16.9% (1321)	50.5
Smoking allowed in ALL indoor places	76.8 (6022)	51.4

The number of subjects was not exactly 8142 because of unknown and missing subjects.