The Disability-Adjusted Life Year (DALY) is composed of two components. A 45-year-old man develops total blindness (disability weight 0.6) following a work injury and lives for 20 more years. His Years Lived with Disability (YLD) assuming no age-weighting or discounting is:
- A 12 ✓
- B 20
- C 33
- D 0.6
Correct answer: A. 12
Explanation
YLD = Duration of disability × Disability Weight = 20 years × 0.6 = 12 YLD. In the simplified DALY formula (without age-weighting or discounting, as used in Global Burden of Disease 2010 onwards), YLD = number of incident cases × disability weight × average duration. The total DALY = YLL (Years of Life Lost) + YLD. Here YLD = 20 × 0.6 = 12.
Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.
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