It links to the actual paper if you are interested, the paper has a whole table of covariates it took into consideration. https://content.iospress.com/articles

It links to the actual paper if you are interested, the paper has a whole table of covariates it took into consideration. https://content.iospress.com/articles/journal-of-alzheimers-disease/jad220361#jad--1-jad220361-t002 https://content.iospress.com/articles/journal-of-alzheimers-... I don't think the paper or the journal article suggested it was causal either. But such a correlation with such a large population warrants publication and further research into causation. You unfortunately chose literally the first thing that any epidemiologist would consider, which is considering potential confounders. Maybe read up a bit before commenting.