RT Journal
A1 Mitka M
T1 BLood type linked to heart disease risk, but clinical significance unlikely
JF JAMA
JO JAMA
YR 2012
FD October 3
VO 308
IS 13
SP 1306
OP 1307
DO 10.1001/2012.jama.11810
UL http://dx.doi.org/10.1001/2012.jama.11810
AB 
The research found that, when compared with individuals with type O, those with type A blood have a 6% greater risk of heart disease, those with type B have a 15% greater risk, and those with type AB have a 23% greater risk. In the United States, about 44% of individuals have type O blood, 42% type A, 10% type B, and 4% type AB. The association was not changed by other known heart disease risk factors, including age, sex, alcohol consumption, smoking, physical activity, or having diabetes mellitus.