YLL Calculation

• Measures years lost due to premature death.
• Introduced by William Haenszel in the late 1940s.
• Formalized by Mary Dempsey in 1947 to assess tuberculosis burden.
• Formula:
  • \(YLL = N \cdot le\)
  • \(N\) = Number of premature deaths
  • \(le\) = Standard life expectancy at current age