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Individual Disability-Adjusted Life Year: A Summary Health Outcome Indicator Used for Prospective Studies

  • P. Zhang
  • M. Woodward
  • J. Shen
  • Y. Wu
Reference work entry

Abstract:

In order to assess global health at individual level in prospective studies, a standard summary indicator of health – Individual DALY was established. It integrated all kind of disease into one measure, reflecting the healthy years lost during a period of time for an individual, with consideration of societal “ideal.”

Similar to Disability-Adjusted Life Year (DALY), Individual DALY used disability and disability weight to measure health problem and its severity after adjusting age and  time preference. Following assumptions were made: (1) individual DALY be defined as the cumulated  healthy life years lost for an individual during follow-up; (2) health status during a certain period of time kept stable, and the corresponding disabilities and disability weights could be assessed either by standard assessment tools during follow-up, or using the disease specific disability weights reported by  Global Burden of Disease study, with the precondition that the synthetic disability weight of  comorbidity had been resolved; (3) death be regarded as a special disability and assumed to be followed up until the end-point of follow-up. As a supplement to traditional population health assessment indicators, Individual DALY provides individual data and hence leads approaches in finding determinant factors of overall health more directly, evaluating effect of intervention more reasonably, and allocating health resource more effectively.

The calculation procedure, results, possible application and attentions were also illustrated using individual cases as an example.

Keywords

Time Preference Disability Weight Discount Function World Health Survey World Health Organization Disability Assessment 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

List of Abbreviations:

BMI

 body mass index

CHD

coronary heart disease

DALE

 disability-adjusted life expectancy

DALY

disability-adjusted life year

DW

disability weight

GBD

global burden of disease

HeaLY

healthy life year

ICIDH

international classification of impairments, disabilities and handicaps

Individual DALY

 individual disability-adjusted life years

QALY

quality-adjusted life year

RR

 relative risk

SEYLL

standard expected years of life lost

WHODAS

WHO’s disability assessment schedule

YLD

years lost due to disability

YLL

years of life lost

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Copyright information

© Springer Science+Business Media LLC 2010

Authors and Affiliations

  • P. Zhang
    • 1
  • M. Woodward
    • 2
  • J. Shen
    • 3
  • Y. Wu
    • 4
    • 5
  1. 1.Department of Quality ControlBeijing Management Center for Community Health ServiceBeijingChina
  2. 2.Director of Epidemiology and Biostatistics, the George Institute for International Healththe University of SydneyNSWAustralia
  3. 3.Pharmaceutical Product DevelopmentWilmingtonNC
  4. 4.Department of Epidemiology and BiostatisticsPeking University School of Public HealthBeijingChina
  5. 5.The George InstituteBeijingChina

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