California Former first lady Betty Ford was recovering Thursday from unspecified surgery, the office of the late President Gerald Ford said.
The surgery occurred earlier in the week and she was "recovering well" at Eisenhower Medical Center, the statement said.
No other information will be released for several days, the statement said.
Mrs. Ford is 88. Her birthday is Sunday.
Health plans cost more for women, study says
High-deductible health insurance plans favored by many employers often wind up being an unfair burden to women, a new study says, largely because women need many routine medical exams that quickly add up.
The median expense for men younger than 45 in these plans was less than $500, but for women it was more than $1,200, according to a study by Harvard Medical School researchers.
"High-deductible plans punish women for having breasts and uteruses and having babies," said Dr. Steffie Woolhandler, the study's lead author.
Women's costs are higher because women need mammograms, cervical cancer vaccine, Pap tests, birth control and pregnancy-related services that men do not, said Woolhandler.