Table 2

Crude odds ratios and 95% confidence intervals for exposure to environmental tobacco smoke for potential covariates for Newcastle, Australia and Auckland, New Zealand

		Newcastle 1988/89			Newcastle 1992–94			Auckland 1986–88
		Cases			Controls			Cases			Controls			Cases			Controls
		OR	95% CI		OR	95% CI		OR	95% CI		OR	95% CI		OR	95% CI		OR	95% CI
Sex
Male	0.84	0.51–1.38		1.21	0.93–1.58		0.64	0.37–1.10		1.50	1.16–1.95		1.66	0.88–3.12		1.76	1.27–2.45
Female	1.00			1.00			1.00			1.00			1.00			1.00
Age group
35–49	3.54	1.39–8.98		2.87	1.91–4.30		1.38	0.53–3.64		1.12	0.78–1.61		2.12	1.04–4.29		1.62	1.04–2.51
50–54	1.02	0.42–2.48		2.56	1.57–4.19		1.25	0.50–3.12		0.99	0.63–1.56		2.28	1.08–4.84		1.72	1.08–2.75
55–59	1.49	0.75–2.96		2.63	1.63–4.25		0.92	0.40–2.11		0.84	0.52–1.34		2.90	1.49–5.64		1.36	0.86–2.15
60–64	1.00			1.00			1.00			1.00			1.00			1.00
65–69	0.44	0.24–0.80		0.70	0.42–1.19		0.58	0.31–1.09		0.91	0.62–1.36
History of CHD
No	1.00			1.00			1.00			1.00			1.00			1.00
Yes	0.84	0.53–1.34		0.64	0.39–108		0.65	0.38–1.11		0.93	0.59–1.47		0.77	0.46–1.29		1.57	0.87–2.84
Education
Primary or high school	1.00			1.00			1.00			1.00			1.00			1.00
Technical college	0.70	0.33–1.49		1.09	0.78–1.52		0.73	0.39–1.37		0.74	0.54–1.02		1.52	0.84–2.73		1.31	0.90–1.91
University	0.58	0.19–1.77		0.72	0.47–1.12		0.19	0.02–1.52		0.46	0.29–0.73		0.77	0.39–1.50		0.90	0.62–1.31
High blood pressure
No	1.00			1.00			1.00			1.00
Yes	0.89	0.56–1.42		0.86	0.65–1.13		1.23	0.72–2.10		1.16	0.89–1.51
High blood cholesterol
No	1.00			1.00			1.00			1.00			1.00
Yes	1.05	0.66–1.67		0.72	0.53–0.97		1.01	0.60–1.71		0.99	0.74–1.31
Body mass index
<25	1.00			1.00			1.00			1.00			1.00			1.00
25–30	1.53	0.82–2.89		0.90	0.67–1.21		1.14	0.61–2.11		1.47	1.07–2.00		1.31	0.75–2.27		1.36	0.98–1.91
> 30	1.52	0.69–3.36		0.84	0.57–1.23		1.63	0.82–3.22		1.45	1.02–2.06		1.39	0.67–2.86		1.71	1.00–2.93
Unknown	1.38	0.74–2.60		2.21	0.44–11.12		2.92	0.68–12.57

CHD = coronary heart disease.
OR = odds ratios; CI = confidence intervals.