Fascinating Factoid

National Public Radio comes up with a factoid which, if accurate, is very somber indeed.

Abortion is a common procedure in the United States. About a million were performed in 2011, the most recent year for which statistics are available. Three in 10 women have an abortion by age 45.

What isn't clear is whether 3 in 10 is a statistical artifact or an exact statement. For example, does a woman who has three abortions count as one woman or three? In other words, are there three abortions for every 10 women who reach 45 or is it literally true that thirty percent of women will have an abortion by age 45?