Carboxyhaemoglobin levels and their determinants in older British men

BMC Public Health

Table 1 COHb levels in older men: relations to region, social class, employment status, housing tenure

			Model 1				Model 2
		current smoking	COHb				COHb
	N	%	Geometric mean	95%	CI	p	Geometric mean	95%	CI	p
Region of current residence						<0.0001				<0.0001
South	1155	16.5	0.35	0.33	0.38		0.37	0.35	0.39
Midland+Wales	578	18.9	0.52	0.47	0.56		0.51	0.47	0.55
North	1478	20.0	0.53	0.50	0.57		0.52	0.49	0.54
Scotland	392	19.5	0.49	0.44	0.55		0.47	0.42	0.51
Social Class						<0.0001				0.0344
I	274	9.9	0.37	0.32	0.42		0.46	0.42	0.51
II	882	14.9	0.44	0.41	0.47		0.48	0.46	0.51
IIIN	472	16.5	0.44	0.40	0.48		0.46	0.42	0.49
IIIM	1197	20.6	0.47	0.44	0.50		0.44	0.42	0.49
IV	475	25.3	0.56	0.51	0.62		0.48	0.44	0.51
V	130	23.4	0.49	0.41	0.59		0.40	0.34	0.46
Employment						0.0178				0.8007
Unemployed	77	29.0	0.64	0.50	0.83		0.46	0.37	0.56
employed – (full or part time)	613	19.3	0.44	0.40	0.49		0.47	0.43	0.50
Retired	2834	18.2	0.46	0.44	0.48		0.45	0.43	0.47
Housing tenure						0.0001				0.6273
owner occupier	3041	16.3	0.43	0.42	0.45		0.45	0.44	0.47
renting from local authority	342	33.4	0.68	0.60	0.76		0.47	0.43	0.52
renting privately	85	35.3	0.70	0.55	0.88		0.50	0.42	0.60
Other	33	24.2	0.50	0.35	0.73		0.47	0.35	0.64

Social class: (non manual) I professional, II intermediate, IIIN skilled non-manual, (manual) IIIM skilled manual, IV semi skilled manual, V unskilled manual
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

ISSN: 1471-2458