4.1. Eye color prevalence Country'Blue''Brown' average74.529.22 Kazakhstan3.33 (0.41-11.53)85.00 (73.43-92.90) Netherlands60.90 (61.97-67.59)21.70 (20.65-25.63) Poland52.50 (49.33-55.55)35.10 (32.17-38.12) 22 more rows