“You don’t say” might be a natural reaction. Firearms are an obvious factor but rates of chronic diseases are far higher in the US, and also child deaths under one year are almost double that of comparable countries; not only that but rates of chronic diseases in children in the US have increased by about 30% in the last 18 years or so, putting the US out on its own in that regard.
In my view it is generally accepted that the US is highly de-regulated in terms of toxins in food, pharma running medicines and environmental hazards.
Despite producing this useful research (readable abstract here) the study’s author (and indeed the CNN article) visibly pull punches as to the main problems, or rather, their sources. And both seem to worry less about the incredibly poor trajectory the US has been on than the possibility that the new HHS under RFKj might cause further harm by ‘fuelling vaccine hesitancy’; this muddying of the water will well please their pharma masters, who are certainly deeply concerned about the health of certain golden geese.