Table 4.

Risk factors of low air conditioner ownership rate and low frequency of air conditioners usage at home or in the office/school based on multivariate logistic regression analysis.

Variable	Non-ownership of air conditioners				Low frequency of air conditioners usage until very hot
	At home		In the office/school		At home		In the office/school
	OR(95%CI)	p value	OR(95%CI)	p value	OR(95%CI)	p value	OR(95%CI)	p value
Age (year)		<0.0001		<0.0001		0.0005		<0.0001
31–40	1.00		1.00		1.00		1.00
41–64	1.62(1.32–1.99)	<0.0001	1.75(1.41–2.15)	<0.0001	1.53(1.29–1.82)	<0.0001	1.64(1.36–1.99)	<0.0001
Gender							–	–
Male	1.00		1.00		1.00
Female	1.51(1.21–1.88)	0.0002	1.46(1.17–1.81)	0.0008	1.21(1.01–1.44)	0.037
Occupation types							–	–
Outdoor	1.00		1.00		1.00
Half indoors and half out door	0.71(0.47–1.07)	0.880	0.98(0.64–1.48)	0.236	1.43(0.92–2.22)	0.024
Indoors	0.48(0.33–0.71)	<0.0001	0.67(0.45–0.98)	0.003	1.05(0.7–1.58)	0.318
Education					–	–
High school or below	1.00		1.00				1.00
Undergraduate	0.74(0.56–0.97)	0.246	0.47(0.36–0.62)	0.486			0.74(0.56–0.98)	0.186
Graduate or above	0.41(0.26–0.63)	0.0001	0.27(0.17–0.41)	<0.0001			0.4(0.27–0.6)	<0.0001
Income (yuan)
<5,000	1.00		1.00		1.00		1.00
5,001–10,000	0.49(0.37–0.66)	<0.0001	0.43(0.32–0.57)	<0.0001	0.37(0.3–0.46)	<0.0001	0.41(0.31–0.53)	<0.0001
>10,000	0.80(0.64–1.01)	0.220	0.69(0.55–0.87)	0.586	0.51(0.42–0.62)	0.032	0.56(0.45–0.7)	0.195
Region
Southern	1.00		1.00		1.00		1.00
Northern	7.14(5.8–8.79)	<0.0001	9.08(7.33–11.23)	<0.0001	1.67(1.32–2.12)	<0.0001	1.82(1.4–2.36)	<0.0001
Number of chronic diseases	–	–	–	–			–	–
0					1.00
1					0.93(0.76–1.14)	0.463
≧2					0.73(0.56–0.96)	0.046