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