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Table 4 COHb levels in older men: relations to prevalent cardiovascular disease.

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
Recall of doctor diagnosis of           
Myocardial infarction       0.5927     0.1744
Yes 382 15.7 0.47 0.42 0.53   0.48 0.44 0.53  
No 3147 19.0 0.46 0.44 0.47   0.45 0.44 0.47  
Angina       0.1972     0.0492
Yes 522 15.4 0.48 0.44 0.53   0.49 0.45 0.53  
No 3007 19.2 0.45 0.44 0.47   0.45 0.44 0.47  
Stroke       0.0644     0.9806
Yes 199 21.3 0.52 0.45 0.61   0.46 0.40 0.52  
No 3330 18.5 0.45 0.44 0.47   0.46 0.44 0.47  
Peripheral arterial disease       0.0030     0.2144
Yes 162 23.1 0.59 0.50 0.69   0.50 0.43 0.57  
No 3367 18.4 0.45 0.44 0.47   0.45 0.44 0.47  
  1. Model 1: Includes the relevant factor with adjustment for age, time of day, season.
  2. 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
  3. (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).
  4. p values presented refer to the results of statistical tests of heterogeneity in COHb levels between the explanatory variable categories