Table 5.

Comparison of decorating materials and pollution control measures in polluted and non-polluted house

Control measures	Polluted		Non-polluted		X2	df	P
	n	%	n	%
Environmentally-friendly decorative materials
Yes	34	28.57	48	71.46	32.26	1	<0.001
No	85	71.34	19	28.36
Storage time after decorating
>6 months	43	36.13	52	77.61	29.51	1	<0.001
<6 months	76	63.87	15	22.39
Ventilation frequency
<1 time/week	61	51.26	11	16.42	8.269	2	0.016
1 time/week-1 time/ day	28	23.53	27	40.30
>1 time/day	30	25.21	29	43.28
Pollution control
Yes	18	15.13	12	17.91	0.246	1	0.62
No	101	84.87	55	82.09

Note. df: degrees of freedom