The latest Australian survey shows one-in-four women (26%) will experience an unplanned pregnancy and 30% will choose abortion.
The 2015 survey published in the November Medical Journal of Australia shows 41.4% of women were using contraception at the time, with 64% opting for the oral contraceptive pill and 27% using condoms.
More than half unintended pregnancies occurred in the 25-34 age group.
Teen pregnancies accounted for 12% of unintended pregnancies.
Other research has indicated higher contraceptive use (up to 60%) among women experiencing an unplanned pregnancy, higher overall abortion rates of around 33%, and a higher overall percentage of women having an unintended pregnancy (up to one-in-two).
The latest survey also shows fewer unintended pregnancies among women 20-24 compared with the latest abortion statistics from Western Australia and South Australia showing 21%-29% among this age group.
Researchers involved in the latest national survey interviewed more than 2000 women who had experienced an unintended pregnancy in the past decade.
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