Interesting data, but shouldn’t this also be compared to the average birth month pattern in general? That would provide more evidence for the relative age effect. Births are not equal across all months to start with in humans (even simplistically based on days of the moths).
As a economist, was going to say that. This is partly inconclusive data. It’s need to be crossed like you said with average births per month maybe across healthy males between 8-18 years of age and 18-35, to differentiate if this affects only in youth or in adulthood as well
The September one can be explained because some countries have a September cutoff for academics/sports instead of January. At least, from my experience, UK and US have a September cutoff. In Spain, France, Italy Im sure the cutoff is in January, I’m not sure about the rest.
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