Researchers interviewed 150 women who were having their eggs frozen at eight clinics in the US and Israel between June 2014 and August 2016. More than 80 percent of participants had college degrees.

Of the 114 US participants, 47 percent had a master’s degree and 34 percent had an MD, PhD or the equivalent. The findings were recently presented at the European Society of Human Reproduction and Embryology conference in Geneva. They have not yet been submitted to an academic journal.

“There is a major gap — they are literally missing men,” Marcia Inhorn, lead author of the study and a professor at Yale, said at the conference. “There are not enough college graduates for them. In simple terms, this is about an oversupply of educated women.”