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275 points rntn | 2 comments | | HN request time: 0.001s | source
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firesteelrain ◴[] No.45158651[source]
Dementia rates in Miami Dade are among the highest in the country while Utah is on the low end. What is striking is that Utah has worse air quality, which is a known risk factor, yet still shows lower prevalence.

Why is that?

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1. chongli ◴[] No.45158967[source]
Gotta control for age. Even if air pollution is a major cause of dementia, the disease takes decades to appear.

Utah has the highest birth rate and therefore the youngest population of the 50 states (median age 31.5 years). Florida is not the oldest state, but it's near the top (median age 42.7 years).

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2. biophysboy ◴[] No.45159959[source]
Dementia by state comparisons that look at prevalence above age 65 give the conclusion for Utah & Florida