Women over age 65 have a higher chance of being overprescribed medication than elderly men, according to a new study published Thursday.

The study, conducted by the University of British Columbia, found close to one in three elderly women to be prescribed “potentially inappropriate” drugs, lead researcher Steve Morgan, Ph.D., told CBC News. One in four elderly men received problematic prescriptions.

Taking income, ethnicity and marriage into account, researchers found women to be up to 23% more likely to receive an inappropropriate prescription than men.

The study backs up previous research findings, but has more data than earlier research. That extra data helped eliminate some factors of why women are more likely to be overprescribed, including women living longer than men.