As the paper points out that's accounted for in the analysis, because shockingly enough to most internet commentators researchers know that they need to control for confounding variables
https://www.bmj.com/content/387/bmj-2024-082194
Always insane to me how people will just read the headline of an article and point out "flaws" based on what they assume the article says
Always insane to me how people will just read the headline of an article and point out "flaws" based on what they assume the article says