Evidence that prenatal testosterone transfer from male twins reduces the fertility and socioeconomic success of their female co-twins.

However, as expected, the coefficients in co-twin death sample are at the margin of statistical significance owing to the much smaller sample size of this group ( P = 0.84 for STEM/economics major, 0.30 for probability of being in labor force, and between <0.01 and 0.10 for the remaining outcomes).

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