The Disability-Adjusted Life Year (DALY) is a composite health metric. In calculating DALYs, the 'disability weight' for a health condition represents:

• A A value between 0 (perfect health) and 1 (death) reflecting the severity of the health state ✓
• B The number of years of life lost due to premature death from that condition
• C The proportional mortality from that condition in the population
• D The average age at onset of disability due to that condition

Explanation

DALYs = YLL (Years of Life Lost to premature death) + YLD (Years Lived with Disability). YLD = number of incident cases × disability weight × average duration of the condition. Disability weight is a value between 0 (perfect health) and 1 (equivalent to death), derived from population surveys and expert consensus, reflecting the magnitude of health loss associated with a given health state — it is NOT the proportion of deaths or years lost. For example, moderate hearing loss has a disability weight of ~0.04 while severe depression may be ~0.65. This framework enables comparison of mortality and morbidity burden across diverse conditions on a single scale.

Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.

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Written and medically reviewed by the StethoPrep medical team.