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Few studies examining predictors of twinning consider younger mothers who do not use assisted reproductive technologies (ART). Higher parity is associated with greater odds of having a twin birth, but it is unclear whether this association is present among young women. We tested the hypothesis that the rates and odds of twinning would increase with parity among teenage and young adult mothers who did not use ART. We conducted a retrospective, population-based cohort study using 2009-2018 United States National Vital Statistics data on 1
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