3 ms·
Why does the submission headline say "N. America" when the linked article doesn't? The linked article does say have this ridiculous sentence though: "One puzzli
by iso8859-1 6y ago
Why does the submission headline say "N. America" when the linked article doesn't? The linked article does say have this ridiculous sentence though: "One puzzling aspect of the decline is that it seems to be confined to Europe and the United States — it was not seen in Asia, South America or, from limited data, in Africa."
- gnramires 6y ago"Methods This analysis was performed in aggregated data from individuals >65 years of age in 7 population-based cohort studies in the United States and Europe from the Alzheimer Cohort Consortium. First, we calculated age- and sex-specific incidence rates for all-cause dementia, and then defined nonoverlapping 5-year epochs within each study to determine trends in incidence. Estimates of change per 10-year interval were pooled and results are presented combined and stratified by sex." I thought it could be related to demographics, but they calculated using age-specific rates. Still, if the age bins are not small enough there could be some leftover bias (more older people in each bin for older countries). But that's for between-country comparison. The age distribution within the US itself might not have changed enough to account for the reduction.