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Table 1 COHb levels in older men: relations to region, social class, employment status, housing tenure

From: Carboxyhaemoglobin levels and their determinants in older British men

    Model 1     Model 2    
   current smoking COHb     COHb    
  N % Geometric mean 95% CI p Geometric mean 95% CI p
Region of current residence       <0.0001     <0.0001
South 1155 16.5 0.35 0.33 0.38   0.37 0.35 0.39  
Midland+Wales 578 18.9 0.52 0.47 0.56   0.51 0.47 0.55  
North 1478 20.0 0.53 0.50 0.57   0.52 0.49 0.54  
Scotland 392 19.5 0.49 0.44 0.55   0.47 0.42 0.51  
Social Class       <0.0001     0.0344
I 274 9.9 0.37 0.32 0.42   0.46 0.42 0.51  
II 882 14.9 0.44 0.41 0.47   0.48 0.46 0.51  
IIIN 472 16.5 0.44 0.40 0.48   0.46 0.42 0.49  
IIIM 1197 20.6 0.47 0.44 0.50   0.44 0.42 0.49  
IV 475 25.3 0.56 0.51 0.62   0.48 0.44 0.51  
V 130 23.4 0.49 0.41 0.59   0.40 0.34 0.46  
Employment       0.0178     0.8007
Unemployed 77 29.0 0.64 0.50 0.83   0.46 0.37 0.56  
employed – (full or part time) 613 19.3 0.44 0.40 0.49   0.47 0.43 0.50  
Retired 2834 18.2 0.46 0.44 0.48   0.45 0.43 0.47  
Housing tenure       0.0001     0.6273
owner occupier 3041 16.3 0.43 0.42 0.45   0.45 0.44 0.47  
renting from local authority 342 33.4 0.68 0.60 0.76   0.47 0.43 0.52  
renting privately 85 35.3 0.70 0.55 0.88   0.50 0.42 0.60  
Other 33 24.2 0.50 0.35 0.73   0.47 0.35 0.64  
  1. Social class: (non manual) I professional, II intermediate, IIIN skilled non-manual, (manual) IIIM skilled manual, IV semi skilled manual, V unskilled manual
  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
  4. (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).
  5. p values presented refer to the results of statistical tests of heterogeneity in COHb levels between the explanatory variable categories