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Bear in mind that for recruits (age 21-23) hair color could be darker in later years. It can't be repsresentative for whole adult population.
Better are surveys which test people between age 18-50.
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They aren't necessarily better because in a study which uses a wide age range (like 18-50) you don't know exactly how frequent each age is represented and thus two of these studies can have twisted results because one study used more people that are closer to 18 that the other. The hair color that people reach in their early adulthood is what they are genetically programmed to have before hair darkens and later ultimately loses it's pigment. Plus many older people are bald and so on. So I take the early adulthood studies to be most natural. Interesting fact; Poles at 17-67 are about equally blond as Slovenians at age around 20 - at roughly 30%. Someone who doesn't pay attention to age might conclude they are equal, (that's what happened to me initially) that's why one should always keep age in mind when looking at hair color studies.
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Yes, so to use them in wide European study someone has to choose if he uses only young people or those in young and medium age together. Hair color map for Europeans in "recruit" age would be different than for all adults. Mixing such data (recruit Estonian and Slovenians, Poles 17-67 and so on) would be non-scientific. I know you want to create such map, but be careful
BTW Karin Mark surveyed Estonians in age 18-50. The same for Cheboksarov's Baltic data which you posted in OP.
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Some additional data from the book:
Russians from eastern parts of Estonia:
86.2% Light Eyed
37.6% Light and Dark blonde
25.3% Light Brown
26.5% Brown
10.6% Dark Brown and Black.
Northern Latvians
84.3% Light eyes
5.5% Dark-mixed
10.2% Brown.
60.9% Light Haired (i guess Blonde to Light Brown)
24.4% Brown
14.7% Dark Brown to Black
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Yes, for whole Lithuania and Latvia it was latest (Cheboksarov & Vitov & Mark). It was published in two papers (one 1954 and second 1959 if remember correctly).
Few years later Denisova published her data but I think only for some regions and it was also collected in '50 ( I don't have those papers). But if you could find her data for living would be great. I can only find those for Baltic craniology.
For Belarus Polesye you can find some data from '70? (Tegako).
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Nope! It is actually more representative to measure people in their 20's. After that many males usually go bald or gray, so the best time for a "perfect" representation is mostly the 20's. 18-50? That is way too wide, most of those of 40-50 years are bald or gray. Their "true" or natural hair colour has already underwent change.
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