Tuesday, September 13, 2011
Sex and bad vision
Looking at ADD Health data, I see that 36.9 percent of young males wear eyeglasses, contacts or both. The number for young females is 53.4 percent. The difference is statistically significant. The pattern is the same for all races. Since this is an adolescent/young adult sample, I assumed the sex difference is due to the earlier maturation of girls, but the gap is just as big for those in their mid-20s. How do we explain this? Male stubbornness? Male hunting/warfare?