Years of potential life lost before age 65--United States, 1990 and 1991.

Years of potential life lost (YPLL) is a public health measure that reflects the impact of deaths occurring in years preceding a conventional cut-off year of age, usually 65 years. YPLL is calculated using final mortality data from CDC's National Center for Health Statistics (1) for the most recent year available, provisional mortality data (i.e., a 10% sample of deaths) (2) for the following year, and population estimates from the U.S. Census. This report summarizes final YPLL data for 1990 and provisional data for 1991.