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Yep, so we can be sure there is genetic confounding in the cross sectional design, and also some C confounding.
In the study we controlled for confounding effects of socioeconomic factors, urbanization (pop. density), age and gender. We don't dismiss the effect of genetics and gene-environment interactions could be an interesting next step from this first exploratory study.
Do you want to take a public bet what controlled analysis will show? :) http://marginalrevolution.com/marginalrevolution/2012/11/a-bet-is-a-tax-on-bullshit.html …
Based on previous twin-studies on green space and mental health, I'm not sure what to expect. But I'm also not a geneticist. https://www.ncbi.nlm.nih.gov/pubmed/25631858
Nice find! Good to see Turkheimer do some actual productive research instead of just being an obscurantist. Looks like z is about 3 for the depression link (se = .15).
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