Table 1.

Characteristics of the study population in year 2000, 2005, and 2010.

Variable	Subgroup	2000	2005	2010
Number of beneficiaries (million)		6.0	6.5	7.3
Age group (% of total)	65-74 years	53.7	53.1	55.5
	75-84 years	34.6	34.9	32.0
	>84 years	11.7	12.0	12.5
Race (% of total)	Whites	84.3	83.6	82.7
	Blacks	13.1	13.4	13.7
	Others	2.6	3.0	3.6
Sex (% of total)	Females	59.0	58.0	56.8
	Males	41.0	42.0	43.2
Dual eligibility (% of total)	Yes	15.0	16.1	15.4
	No	85.0	83.9	84.6
Death (% of total)	Yes	5.2	5.1	4.7
	No	94.8	94.9	95.3