Table 4.

COHb levels in older men: relations to prevalent cardiovascular disease.

			Model 1				Model 2
		current smoking	COHb				COHb
	N	%	Geometric mean	95%	CI	p	Geometric mean	95%	CI	p
Recall of doctor diagnosis of
Myocardial infarction						0.5927				0.1744
Yes	382	15.7	0.47	0.42	0.53		0.48	0.44	0.53
No	3147	19.0	0.46	0.44	0.47		0.45	0.44	0.47
Angina						0.1972				0.0492
Yes	522	15.4	0.48	0.44	0.53		0.49	0.45	0.53
No	3007	19.2	0.45	0.44	0.47		0.45	0.44	0.47
Stroke						0.0644				0.9806
Yes	199	21.3	0.52	0.45	0.61		0.46	0.40	0.52
No	3330	18.5	0.45	0.44	0.47		0.46	0.44	0.47
Peripheral arterial disease						0.0030				0.2144
Yes	162	23.1	0.59	0.50	0.69		0.50	0.43	0.57
No	3367	18.4	0.45	0.44	0.47		0.45	0.44	0.47

Model 1: Includes the relevant factor with adjustment for age, time of day, season.

Model 2: Includes the relevant factor with adjustment for age, time of day, season, and other factors which were statistically significant in the univariate analyses

(region, social class, employment status, housing tenure, active smoking, passive smoking, gas cooking, central heating). An interaction term for active smoking*time of day is also included in the model (see text).

p values presented refer to the results of statistical tests of heterogeneity in COHb levels between the explanatory variable categories