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There are health hazards associated with living at high latitudes, schizophrenia being one. Studies also find that Scandinavians have the weakest bones and highest rate of hip fracture of any people, again likely due to latitude and lack of sunlight:https://link.springer.com/article/10.1007/s00198-012-1964-3/figures/6 …
A complicating factor is that taller people have much higher fracture rates, which likely explains some but not all of the difference e.g. Serbo-Croatians are bigger than Scandinavians, but seem to actually a lower than average fracture ratehttps://academic.oup.com/ije/article-abstract/24/4/783/713501 …
Higher amounts of vit A in diet also possible cause
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