this post was submitted on 31 Aug 2023
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Yes, the article mentions the control group, too. What they don't mention (and I'm curious about) is whether the savings figure quoted was gross or net? I'll quote another comment in this post since I'm not sure how to properly link it.
"Is that gross or net savings? That is, is the $7500 included and there was a net savings, or was there a net cost of $6723?"
Any idea, from skimming the actual study?
https://www.pnas.org/doi/10.1073/pnas.2222103120