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 | Â | Â | Â | Â | Â | <0.0001 | Â | Â | Â | <0.0001 |
South | 1155 | 16.5 | 0.35 | 0.33 | 0.38 | Â | 0.37 | 0.35 | 0.39 | Â |
Midland+Wales | 578 | 18.9 | 0.52 | 0.47 | 0.56 | Â | 0.51 | 0.47 | 0.55 | Â |
North | 1478 | 20.0 | 0.53 | 0.50 | 0.57 | Â | 0.52 | 0.49 | 0.54 | Â |
Scotland | 392 | 19.5 | 0.49 | 0.44 | 0.55 | Â | 0.47 | 0.42 | 0.51 | Â |
Social Class | Â | Â | Â | Â | Â | <0.0001 | Â | Â | Â | 0.0344 |
I | 274 | 9.9 | 0.37 | 0.32 | 0.42 | Â | 0.46 | 0.42 | 0.51 | Â |
II | 882 | 14.9 | 0.44 | 0.41 | 0.47 | Â | 0.48 | 0.46 | 0.51 | Â |
IIIN | 472 | 16.5 | 0.44 | 0.40 | 0.48 | Â | 0.46 | 0.42 | 0.49 | Â |
IIIM | 1197 | 20.6 | 0.47 | 0.44 | 0.50 | Â | 0.44 | 0.42 | 0.49 | Â |
IV | 475 | 25.3 | 0.56 | 0.51 | 0.62 | Â | 0.48 | 0.44 | 0.51 | Â |
V | 130 | 23.4 | 0.49 | 0.41 | 0.59 | Â | 0.40 | 0.34 | 0.46 | Â |
Employment | Â | Â | Â | Â | Â | 0.0178 | Â | Â | Â | 0.8007 |
Unemployed | 77 | 29.0 | 0.64 | 0.50 | 0.83 | Â | 0.46 | 0.37 | 0.56 | Â |
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 | Â | 0.45 | 0.43 | 0.47 | Â |
Housing tenure | Â | Â | Â | Â | Â | 0.0001 | Â | Â | Â | 0.6273 |
owner occupier | 3041 | 16.3 | 0.43 | 0.42 | 0.45 | Â | 0.45 | 0.44 | 0.47 | Â |
renting from local authority | 342 | 33.4 | 0.68 | 0.60 | 0.76 | Â | 0.47 | 0.43 | 0.52 | Â |
renting privately | 85 | 35.3 | 0.70 | 0.55 | 0.88 | Â | 0.50 | 0.42 | 0.60 | Â |
Other | 33 | 24.2 | 0.50 | 0.35 | 0.73 | Â | 0.47 | 0.35 | 0.64 | Â |