Table 1.

Number of subjects who were or were not exposed to secondhand smoke at home and odds ratios (adjusted for age and education, and for sex when men and women were combined) for mortality in people aged 60 or over, Hong Kong. Values are odds ratio (95% confidence interval) unless indicated otherwise

	By sex					By exposure (compared with no exposure)
	Men		Women
Cause of death	Exposed/not exposed	Odds ratio (95% CI)	Exposed/not exposed	Odds ratio (95% CI)	All	1 smoker	2 or more smokers	P for trend
Cases
Cancer:
Lung cancer	33/112	1.34 (0.82 to 2.17)	96/83	1.38 (0.94 to 2.04)	1.39 (1.03 to 1.88)*	1.30 (0.94 to 1.80)	1.74 (1.06 to 2.86)*	0.014
All cancers	166/685	1.16 (0.85 to 1.60)	396/368	1.35 (1.03 to 1.76)*	1.27 (1.03 to 1.55)*	1.14 (0.92 to 1.43)	1.74 (1.22 to 2.48)***	0.003
Respiratory:
COPD	27/69	1.67 (0.95 to 2.94)	27/15	2.90 (1.34 to 6.29)**	1.99 (1.28 to 3.10)***	1.85 (1.14 to 3.00)*	2.51 (1.22 to 5.18)*	0.002
All respiratory	103/374	1.29 (0.87 to 1.92)	126/118	1.52 (1.01 to 2.27)*	1.41 (1.07 to 1.87)*	1.31 (0.97 to 1.78)	1.80 (1.11 to 2.91)*	0.007
Circulatory:
Stroke	65/232	1.31 (0.87 to 1.99)	158/142	1.57 (1.11 to 2.24)*	1.49 (1.15 to 1.94)***	1.34 (1.01 to 1.79)*	2.08 (1.33 to 3.25)***	0.001
IHD	74/285	1.30 (0.88 to 1.93)	113/112	1.39 (0.95 to 2.04)	1.35 (1.03 to 1.76)*	1.26 (0.94 to 1.69)	1.68 (1.05 to 2.68)*	0.015
All circulatory	177/664	1.29 (0.93 to 1.79)	342/334	1.36 (1.02 to 1.81)*	1.35 (1.09 to 1.68)**	1.27 (1.01 to 1.61)*	1.66 (1.13 to 2.42)**	0.002
Injury and poisoning	14/63	1.02 (0.53 to 1.97)	20/29	0.81 (0.43 to 1.52)	0.95 (0.60 to 1.49)	1.03 (0.64 to 1.67)	0.65 (0.25 to 1.74)	0.594
All causes	552/2128	1.25 (0.94 to 1.66)	1112/1046	1.41 (1.11 to 1.79)**	1.34 (1.12 to 1.61)***	1.24 (1.02 to 1.52)*	1.73 (1.24 to 2.40)***	<0.001
Controls	71/347		150/195

COPD=chronic obstructive pulmonary disease; IHD=ischaemic heart disease.

^* P<0.05, ^** P<0.01, ^*** P<0.005 on logistic regression.