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

Whincup et al. BMC Public Health 2006 6:189   doi:10.1186/1471-2458-6-189

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