Carboxyhaemoglobin levels and their determinants in older British men

BMC Public Health

Table 3 COHb levels in non smoking older men: Relations to region, social class, employment status, housing tenure, passive smoking, heating and cooking fuel, double

		Model 1				Model 2
		COHb				COHb
	N	Geometric mean	95%	CI	p	Geometric Mean	95%	CI	p
Region of current residence					<0.0001				<0.0001
South	955	0.26	0.24	0.27		0.26	0.25	0.28
Midland + Wales	465	0.39	0.36	0.42		0.38	0.35	0.41
North	1172	0.39	0.37	0.41		0.39	0.37	0.41
Scotland	313	0.32	0.29	0.36		0.33	0.30	0.37
Social Class					0.018				0.0011
I	245	0.32	0.29	0.35		0.34	0.31	0.38
II	746	0.34	0.32	0.36		0.35	0.33	0.38
IIIN	384	0.35	0.32	0.38		0.36	0.33	0.39
IIIM	943	0.32	0.30	0.33		0.31	0.29	0.33
IV	352	0.37	0.34	0.41		0.35	0.32	0.39
V	98	0.30	0.26	0.36		0.27	0.23	0.32
Employment					0.373				0.6649
Unemployed	54	0.38	0.30	0.48		0.37	0.29	0.47
employed – (full or part time)	492	0.32	0.30	0.35		0.34	0.31	0.37
Retired	2302	0.33	0.32	0.35		0.33	0.32	0.35
Housing tenure					0.071				0.3643
owner occupier	25302	0.33	0.32	0.34		0.33	0.32	0.34
renting from local authority	224	0.37	0.33	0.41		0.35	0.31	0.40
renting privately	55	0.41	0.33	0.51		0.39	0.31	0.49
Other	25	0.30	0.21	0.42		0.33	0.23	0.47
Passive smoking					0.019				0.0896
No	2270	0.33	0.32	0.34		0.33	0.32	0.34
Yes	635	0.36	0.33	0.38		0.35	0.33	0.38
Gas cooking					<0.0001				<0.0001
No	1160	0.29	0.28	0.31		0.30	0.29	0.31
Yes	1660	0.36	0.35	0.38		0.36	0.35	0.38
Gas heating					0.268				0.4189
No	354	0.32	0.29	0.35		0.35	0.32	0.38
Yes	2499	0.34	0.32	0.35		0.33	0.32	0.34
Central heating					0.002				0.0059
No	238	0.39	0.35	0.44		0.39	0.35	0.43
Yes	2622	0.33	0.32	0.34		0.33	0.32	0.34
Double glazing					0.988				0.9038
Yes	1436	0.33	0.32	0.35		0.33	0.32	0.35
No	1286	0.33	0.32	0.35		0.33	0.32	0.35
in part	138	0.34	0.29	0.39		0.34	0.30	0.40

For social class definitions see Table 1
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, passive smoking, gas cooking, central heating).
p values presented refer to the results of statistical tests of heterogeneity in COHb levels between the explanatory variable categories

ISSN: 1471-2458