Unintended pregnancies are the main reason for induced abortions, resulting in about 42 million induced abortions; not all unintended pregnancies result in abortions or unwanted children.
非預期懷孕是堕胎的主要原因，因此1999年約造成四千二百萬的堕胎，也不是所有的非預期懷孕都是以堕胎結束。