Mortality and cancer in relation to ABO blood group phenotypes in the Golestan Cohort Study

A non-modifiable risk factor. I have O negative blood so even that didn't prevent my stroke.
The research article here; 
Mortality and cancer in relation to ABO blood group phenotypes in the Golestan Cohort Study

Conclusions

Non-O blood groups have an increased mortality, particularly due to cardiovascular diseases, which may be due to the effect of blood group alleles on blood biochemistry or their effect on von Willebrand factor and factor VIII levels. 

A news writeup about the research;

What Your Blood Type Says About Your Life Span

In the study, researchers followed about 50,000 middle-age and elderly people in northeastern Iran for an average of seven years. They found that people with non-O blood types were 9 percent more likely to die during the study for any health-related reason, and 15 percent more likely to die from cardiovascular disease, compared with people with blood type O.