For uninsured women the problems were worse, according to the report, titled "Oceans Apart: The Higher Health Costs of Women in the U.S. Compared to Other Nations, and How Reform Is Helping."
The report also found insurance differences in the United States among states.
For example, 30 percent of women in Texas were uninsured, compared with 5 percent in Massachusetts, which has a universal health insurance law similar to the Affordable Care Act, the controversial health-reform legislation signed into law in 2010 by President Barack Obama.
Many of these problems will be solved when the Affordable Care Act is fully implemented, the study authors said.
"With the Supreme Court upholding the constitutionality of the Affordable Care Act, the nation is moving forward on ensuring access to high-quality care for all Americans," Karen Davis, president of the Commonwealth Fund, said during a Thursday news conference.
Once the Affordable Care Act is fully implemented in 2014, the rate of uninsured women will drop from 20 percent to 8 percent, the study authors contended.
Under the Act, women can already get preventive care with no co-pay or deductible for services such as screenings for cervical, breast and colon cancer, cholesterol checks, and osteoporosis and chlamydia screenings. And insurance companies cannot deny coverage because of a preexisting condition, the study authors added.
The law will also prevent insurance companies from charging women higher premiums because of their gender or health.
Dr. Bradley Flansbaum, director of Hospitalist Services at Lenox Hill Hospital
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