Diabetes mellitus was independently associated with slightly younger age ( 63 versus 64 years ; P < 0.001 ) , Hispanic ethnicity ( 36 % versus 28 % ; P < 0.0001 ) , ischemic heart disease ( 11 % versus 6 % ; P = 0.002 ) , and peripheral vascular disease ( 5 % versus 2 % ; P < 0.001 ) .