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Table S1. Frequencies and odds ratios of alcohol use disorder symptoms in dizygotic opposite-sex females, dizygotic same-sex females, and dizygotic same-sex females with a close-in-age older brother.

Table S2. Mean and variance difference tests of drinking phenotypes across dizygotic opposite-sex and dizygotic same-sex females matched for the presence of a close-in-age older brother (i.e., the prenatal effects of having a male cotwin, above the postnatal effects of having a close-in-age older brother).

Table S3. Mean and variance difference tests of drinking phenotypes across dizygotic opposite-sex females with a close-in-age older brother and without any brother (i.e., the postnatal effects of having a close-in-age older brother, above the prenatal effects of having a male cotwin).

Table S4. Mean and variance difference tests of drinking phenotypes across dizygotic opposite-sex and dizygotic same-sex males.

Table S5. Mean and variance difference tests of drinking phenotypes across dizygotic opposite-sex and dizygotic same-sex males matched for the presence of a close-in-age older brother (i.e., the prenatal effects of having a male cotwin, above the postnatal effects of having a close-in-age older brother).

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