About a third of women of reproductive age in the U.S. now live more than an hour from the closest abortion facility after the Supreme Court earlier this year struck down the constitutional right to abortion, a study found.

When more than a dozen states enacted complete or partial abortion bans after the Supreme Court ruling, the number of facilities that actively offer abortion care was cut by about a tenth, from 749 facilities to 671, according to the study, published this month in the Journal of the American Medical Association.

With this drop in facilities, the average travel time to get abortion care more than tripled, increasing from about 28 minutes in 2021 to 100 minutes after the Dobbs v. Jackson Women’s Health Organization ruling, according to the study conducted by a team that included researchers from Boston Children’s Hospital; Boston University School of Public Health; University of California, San Francisco, Harvard University; and Harvard Medical School.

In states with total abortion bans and laws banning abortions as early as six weeks of pregnancy, travel times increased by more than four hours, on average, the study found.

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Southern states were the hardest hit. While once able to travel 15 minutes for an abortion before the Dobbs decision, women in Texas and Louisiana now must travel more than six hours, on average.

“We need to understand the diminished access to this essential health service in order to better understand what resources we need to invest to regain that access,” Yulin Hswen, an assistant professor of epidemiology and biostatistics at University of California, San Francisco, and senior author of the study, said in a statement.

Terry McGovern, professor at the Columbia University’s Mailman School of Public Health, said the study’s results weren’t surprising and “align with the very serious consequences that we were all expecting after Dobbs.”