Table 2

COHb levels in older men: relations to active/passive smoking, heating and cooking fuel, double glazing

Model 1

Model 2


current smoking

COHb

COHb


N

%

Geometric mean

95%

CI

p

Geometric mean

95%

CI

p


    Active smoking

<0.0001

<0.0001

Non

1080

-

0.32

0.30

0.33

0.32

0.30

0.33

Ex

1825

-

0.34

0.33

0.36

0.35

0.34

0.36

Pipe or cigar (light)

76

-

0.60

0.50

0.72

0.61

0.50

0.74

Pipe or cigar (heavy)

99

-

1.50

1.28

1.77

1.53

1.29

1.81

Cigarette smoking <5/d

102

-

1.36

1.16

1.59

1.39

1.17

1.64

cigarette smoking 5–10/d

126

-

2.29

1.98

2.65

2.18

1.87

2.53

cigarette smoking 10–20/d

184

-

3.22

2.86

3.63

3.07

2.70

3.48

cigarette smoking >20/d

51

-

3.29

2.62

4.13

3.18

2.52

4.01

    Passive smoking

<0.0001

0.2306

No

2620

12.8

0.40

0.38

0.42

0.45

0.44

0.47

Yes

983

34.4

0.66

0.62

0.70

0.47

0.45

0.50

    Gas cooking

<0.0001

<0.0001

No

1394

16.3

0.40

0.38

0.42

0.42

0.40

0.44

Yes

2083

20.2

0.51

0.48

0.53

0.48

0.47

0.50

    Gas heating

0.7934

0.9968

No

455

21.3

0.46

0.42

0.51

0.46

0.42

0.50

Yes

3074

18.2

0.46

0.44

0.47

0.46

0.44

0.47

    Central heating

<0.0001

0.0083

No

340

29.6

0.64

0.57

0.71

0.52

0.47

0.57

Yes

3201

17.5

0.44

0.43

0.46

0.45

0.44

0.46

    Double glazing

0.7657

0.8951

Yes

1778

18.6

0.45

0.43

0.48

0.45

0.44

0.47

No

1594

18.9

0.46

0.44

0.49

0.46

0.44

0.48

in part

169

16.9

0.45

0.38

0.53

0.47

0.41

0.53


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

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

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