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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

From: Carboxyhaemoglobin levels and their determinants in older British men

   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  
  1. For social class definitions see Table 1
  2. Model 1: Includes the relevant factor with adjustment for age, time of day, season.
  3. 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).
  4. p values presented refer to the results of statistical tests of heterogeneity in COHb levels between the explanatory variable categories