Table 1

The years lived with disability (YLDs) and the years of life lost (YLLs)

Two-dimensional (time√ódisability weight)One-dimensional (time)
Concern about individual burden
Experience: Do we experience it?YesNo
Time: Does it harm us through time?YesNo
Symmetry: Does it treat the past and future equally?YesNo
  • Based on the three arguments, we may question whether YLLs measure an individual burden, if not, then YLDs and YLLs will be incommensurable.