It’ not about relative age (either as in age of one person divided by age of another or one age substracted from another), it’s about their month of birth. So it’s evidence for relevance of amount of received sunshine during pregnancy, relevance of age of being admitted in school and relevance of astrology.
Since it seems to somewhat align with different kinds of education starting in different times of year, my personal bet is on schools, though I wouldn’t completely discount differences of pregnancies in different times of the year (sorry, astrology, but I need a lot more evidence to seriously consider you).
Did they compare regions with different cut-off dates? For example, in NY it’s in December, and in MA it’s in September. Actually looks like it’s 12⁄1 in NYC and 12⁄31 on Long Island, too. Those would help distinguish age vs sunlight or other seasonal effects on development.
It’ not about relative age (either as in age of one person divided by age of another or one age substracted from another), it’s about their month of birth. So it’s evidence for relevance of amount of received sunshine during pregnancy, relevance of age of being admitted in school and relevance of astrology.
Since it seems to somewhat align with different kinds of education starting in different times of year, my personal bet is on schools, though I wouldn’t completely discount differences of pregnancies in different times of the year (sorry, astrology, but I need a lot more evidence to seriously consider you).
Did they compare regions with different cut-off dates? For example, in NY it’s in December, and in MA it’s in September. Actually looks like it’s 12⁄1 in NYC and 12⁄31 on Long Island, too. Those would help distinguish age vs sunlight or other seasonal effects on development.
Yes this effect is consistent across different countries with different cut off dates.