As noted in the article, the study was unable to distinguish between causation and correlation. This study is further complicated by its failure to find a corr

As noted in the article, the study was unable to distinguish between causation and correlation. This study is further complicated by its failure to find a correlation between anticholinergic antihistamines and dementia that IIRC was noted in the earlier study pointed to by a sibling. That other study specifically noted the use of anticholinergics in controlling certain prodromal symptoms of dementia which leads back to the causation/correlation uncertainty and the desperate need to resolve the uncertainty.