Why do epidemiologists use age-adjusted rates when comparing mortality data?
Answer
To account for differences in population age structures between groups
Raw mortality counts can be misleading when comparing populations with different age demographics. For example, a region with a significantly older population will naturally show higher raw death counts for age-related conditions like Alzheimer's disease. Age adjustment standardizes data against a reference population, allowing for a fair comparison of disease risk that is independent of the age distribution.

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