Scientists believe that females in opposite-sex twins are exposed to higher than normal levels of testosterone in the womb, which could affect their behavior.
Women who have a male twin are less likely to graduate from high school than those born with a female twin, according to a study. Scientists studied all 13,717 twins born in Norway between 1967 and 1978 to understand whether being a woman born with a twin brother affected the ability to hit traditional markers of success in adulthood.
The data revealed that females with a male twin were less likely to graduate from high school or college, by 15.2 percent and 3.9 percent, respectively. They also had lower fertility rates and earnings . These women were also less likely to get married, by 11.7 percent. A similar trend was found in women whose sibling had died, suggesting the difference wasn't socialized.
"We are not showing that exposed females are necessarily more 'male-like,' but our findings are consistent with the idea that passive exposure to prenatal testosterone changes women's education, labor market and fertility outcomes," he said.
France Dernières Nouvelles, France Actualités
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