Years of Potential Life Lost
Premature mortality is measured by the Years of Potential Life Lost (YPLL)
statistic, which is simply the sum of the years of life lost annually by persons
who suffered early deaths.1 For the purpose of calculating YPLL,
premature death is defined as death occurring before the age of 65. Thus, the
population at risk of premature mortality is the group of Texas residents
between the ages of 0 and 64. YPLL are calculated using death certificate data.
To calculate YPLL, the person's age at death is subtracted from 64.5. The
result of this subtraction is the years of potential life lost by the decedent.
The number of years of potential life lost by a person who died at age 60 is
thus 4.5. Once YPLL is calculated for each decedent, individual YPLL values are
summed to produce the total years of potential life lost by all Texas residents
during the year.
YPLL = ∑ ( 64.5DEATHS - X decedent's age in years
A further statistic, the YPLL rate, is the number of years of potential life
lost before age 65 per 1,000 population ages 0-64.
YPLL Rate = ( YPLL / Population < 65 Years of Age ) *
Alternative methods have been developed to estimate potential years of life
lost. For example, 'Working Years of Life Lost' examines YPLL for individuals
age 15 through 65 years. Life expectancies may also be used to define premature
death (death before attaining the age of life expectancy at birth). The YPLL
statistic may also be calculated for specific causes of death.
1. Premature Mortality in the United States: Public Health Issues in the Use of
Years of Potential Life Lost. MMWR, 1986; 35: 2S, 1s-11s.
2010 Annual Report List of Tables and References
Annual Reports for
Center for Health Statistics