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The findings of Lawlor, et al., may be explained by increased
testosterone. It is my hypothesis that increased testosterone results in
early puberty and reduced final growth of the brain. This results in
reduced ability to learn mathematics and language. This results in
reduced ability to compete in a technological work force; it results in
lower socioeconomic level. Testosterone is directly connected with
insulin resistance (Wien Klin Wochenschr 2002 May 15;114(8-9):321-6). I
suggest the connection of socioeconomic level with insulin resistance in
this study is a consequence of increased testosterone levels.
No competing interests
11 October 2002
James M. Howard
1037 North Woolsey Avenue, Fayetteville, Arkansas 72701-2046, U.S.A.