The Disability-Adjusted Life Year (DALY) is correctly defined as:

• A Years of life lost due to premature mortality only (YLL)
• B Sum of Years of Life Lost (YLL) and Years Lived with Disability (YLD) ✓
• C Proportion of disabled population multiplied by life expectancy
• D Quality-adjusted life years (QALYs) subtracted from expected lifespan

Explanation

DALY = YLL + YLD. YLL quantifies premature mortality (deaths before expected lifespan); YLD quantifies time spent in states of less than full health, weighted by disease severity (disability weight 0 = full health, 1 = death equivalent). One DALY = one year of healthy life lost. DALYs are used in WHO Global Burden of Disease studies and India's National Burden estimates to compare health losses across diseases, populations, and risk factors.

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

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Written and medically reviewed by the StethoPrep medical team.