Table 3.
Relation with lifelong smoking status in male doctors who died of or with dementia versus matched controls
| Type of dementia | No of cases (controls)
|
Heterogeneity | Risk ratio (95% CI)
|
|||||
|---|---|---|---|---|---|---|---|---|
| Continuing smokers | Long term ex-smokers* | Never smoked regularly | Continuing v ex-smokers* | Continuing v never smokers | Ex*v never smokers | |||
| Probably or definitely due to Alzheimer's disease | 147 (591) | 156 (665) | 67 (224) | χ2=2.2, P=0.3 | 1.07 (0.83 to 1.38) | 0.83 (0.60 to 1.16) | 0.78 (0.56 to 1.10) | |
| Vascular or Lewy body | 43 (187) | 44 (162) | 16 (63) | χ2=0.5, P=0.8 | 0.83 (0.51 to 1.34) | 0.94 (0.49 to 1.82) | 1.07 (0.57 to 2.02) | |
| Any | 190 (778) | 200 (827) | 83 (287) | χ2=1.6, P=0.4 | 1.01 (0.81 to 1.27) | 0.85 (0.63 to 1.14) | 0.84 (0.63 to 1.13) | |
*
Stopped smoking on average 34 years.