Estimating disability-adjusted life years

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Estimating disability-adjusted life years (DALYs) is a method for summarising all health impacts into a single currency, DALY.

Scope

How should DALYs be calculated so that it is in accordance with the WHO?

Definition

[1]

Result

DALY in case of recovery:

Peffect  * (Prec* YLDrec * Sev)


DALY in case of death

Peffect * [Pdie *(YLDdie * Sev) + L.E. - C.A. - YLDdie]


DALY if 'diseased' to natural life expectancy (chronic disease)

Peffect * (1 - Prec - Pdie) * (L.E. - C.A.) * Sev


Where:

  • Peffect = Probability of the considered effect (dose-response relationship)
  • Prec = Probability to recover from a disease
  • Pdie = Probability to die from a disease
  • YLDrec = Years Lived with Disability in case of full recovery [2]
  • YLDdie = Years Lived with Disability in case of death
  • Sev = Severity of the effect (0-1)[1] [3] [4]
  • L.E. = Life expectancy
  • C.A. = Current Age

References

  1. 1.0 1.1 Murray CJL, Lopez AD, eds. 1996. The global burden of disease: a comprehensive assessment of mortality and disability from diseases, injuries and risk factors in 1990 and projected to 2020. Cambridge, Harvard School of Public Health on behalf of the World Health Organization and the World Bank.
  2. Data by regions (European), for example YLD (years of life lived with the disease)
  3. An update of the disability weights
  4. Dutch disability weights Available only in Dutch.