Posted by: 90sRetroFan
« on: November 06, 2023, 08:40:35 pm »Long ago, Zea_mays and I had already identified heritable myopia as a likely positive correlate with Aryan traits, since myopia would be completely debilitating for hunters and a major inconvenience for herders but only a minor inconvenience for farmers, hence likely to be more strongly selected against by the former lifestyles but only weakly (if at all) selected against by the latter.
Now I just came across:
Note the negative correlation between myopia and weight (4th graph) as well as with what looks like BMI (5th graph), which supports our theory given the advantages of low weight/BMI in farming already covered here:
https://trueleft.createaforum.com/human-evolution/aryan-bones/msg656/#msg656
Distribution:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3055754/
Now I just came across:
Note the negative correlation between myopia and weight (4th graph) as well as with what looks like BMI (5th graph), which supports our theory given the advantages of low weight/BMI in farming already covered here:
https://trueleft.createaforum.com/human-evolution/aryan-bones/msg656/#msg656
Distribution:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3055754/
Quote
In children from similar sociodemographic backgrounds attending the same schools, South Asian children were nine times more likely to be myopic and black African Caribbeans three times more likely, compared with white Europeans.
...
Data were available for 1179 children. The prevalence of myopia was 25.2%, 10.0%, and 3.4%, respectively, in the South Asian, black African Caribbean, and white European children. Adjusted odds ratios (ORs) of myopia compared with the white European children were 8.9 (95% confidence interval [CI] 4.0 to 19.4) in the South Asian and 3.2 (95% CI, 1.4 to 7.2) in black African Caribbean children. Ethnic differences in the prevalence of myopia were largely accounted for by ethnic differences in axial length. The South Asian and black African Caribbean children had longer axial lengths (0.44 mm; 95% CI, 0.30 to 0.57 mm and 0.30 mm; 95% CI, 0.16 to 0.44 mm, respectively).