Columbia subject headings:
Health insurance--United States--Statistics.
Medicare--Statistics.
Older people--Services for--United States--Statistics.
Harvard subject headings:
Health insurance--United States--Statistics
Medicare--Statistics.
Older people--Services for--United States--Statistics.
Statistics.
Princeton subject headings:
Health insurance--United States--Statistics.
Medicare--Statistics.
Older people--Services for--United States--Statistics.
Statistics.