Table 1. Characteristics of Patients and Care Provided to Medicare Beneficiaries Admitted for Acute Myocardial Infarctions, 1999-2014^a.

Characteristics	Proportion, Mean (SE)
	1999-2000 (20% Sample) (72 473)	2004 (20% Sample) (38 248)	2008 (100% Sample) (159 558)	2013-2014 (100% Sample) (209 614)
Demographic
Age groups, y
65-74	0.38 (0.49)	0.36 (0.48)	0.36 (0.48)	0.40 (0.49)
75-84	0.42 (0.49)	0.41 (0.49)	0.39 (0.49)	0.36 (0.48)
≥85	0.20 (0.40)	0.22 (0.42)	0.26 (0.44)	0.25 (0.43)
Race
White	0.91 (0.29)	0.90 (0.30)	0.89 (0.31)	0.87 (0.33)
Black	0.06 (0.25)	0.07 (0.26)	0.07 (0.26)	0.08 (0.27)
Other	0.03 (0.68)	0.03 (0.17)	0.03 (0.18)	0.05 (0.21)
Female	0.50 (0.50)	0.50 (0.50)	0.49 (0.50)	0.47 (0.50)
Comorbid conditions
Ischemic heart disease	0.45 (0.50)	0.48 (0.50)	0.42 (0.49)	0.43 (0.50)
Peripheral vascular disease	0.12 (0.32)	0.13 (0.33)	0.12 (0.33)	0.11 (0.32)
Cerebrovascular disease	0.12 (0.32)	0.11 (0.31)	0.11 (0.31)	0.10 (0.30)
Diabetes	0.30 (0.46)	0.31 (0.46)	0.32 (0.47)	0.35 (0.48)
Mortality, d
30 and 31-180	0.27 (0.44)	0.25 (0.44)	0.24 (0.43)	0.22 (0.41)
30	0.17 (0.38)	0.15 (0.36)	0.14 (0.35)	0.12 (0.33)
31-180b	0.11 (0.32)	0.12 (0.33)	0.12 (0.32)	0.10 (0.31)

^aInternational Classification of Diseases, Ninth Revision codes are as follows: ischemic heart disease (428), peripheral vascular disease (440-448), cerebrovascular disease (430-438), and diabetes (250).

^bThe 31- to 180-day rate is conditional on surviving the first 30 days.