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Editor's Note: Mohammed AlQuraishi is an assistant professor of systems biology at the Columbia University Vagelos College of Physicians and Surgeons.

“It’s a really significant turning point,” said Deborah Hasin, a professor of epidemiology at Columbia University who performed the unique analysis of other data from the survey for The Times.

“It’s probably an indication of women [who] wanted to reduce uncertainty and protect themselves,” said lead author Xiao Xu, an associate professor of reproductive sciences at Columbia University.