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by diffeomorphism 3005 days ago
This is discussed in the Limitations section of their article: https://jamanetwork.com/journals/jama/fullarticle/2677445

> Third, despite adjusting for conditions that frequently precipitate wealth shocks, including marital disruption, unemployment, and a variety of health status and access to care indicators, residual confounding is likely.

They adjusted for it, but maybe not enough.