Women with employer-based health insurance are almost twice as likely as are men to be covered as dependents, according to a new study.

25% of women are covered as dependents under their spouse’s health plan, compared to 13% of men, according to the study of U.S. Census Bureau data by Henry J. Kaiser Family Foundation, Menlo Park, Calif.

That makes many women more vulnerable than are men to losing their insurance should they become widowed or divorced or if their spouse lose their jobs, notes the foundation.

Kaiser also found 38% of women get health coverage through their jobs, compared to 48% of men.

More than 17 million women from age 18 to 64–18% of women in this group–are uninsured, according to the analysis. Among men in that age group, 23% are uninsured.

A separate study by Kaiser found that 14% of women said they had delayed or gone without needed health care because they could not afford it.