There is an even more fundamental problem. Psychiatrists do not apply uniform diagnostic criteria. This is painfully obvious in genetic studies of depression.

There is an even more fundamental problem. Psychiatrists do not apply uniform diagnostic criteria. This is painfully obvious in genetic studies of depression. The work of Jonathan Flint has highlighted this serious problem. https://pubmed.ncbi.nlm.nih.gov/32231276/ https://pubmed.ncbi.nlm.nih.gov/32231276/ https://pubmed.ncbi.nlm.nih.gov/25062429/ https://pubmed.ncbi.nlm.nih.gov/25062429/