Data refer to number of pregnancies per 100 women during first year of use.
Typical use: refers to failure rates for women and men whose use is not consistent or always correct.
Correct use: refers to failure rates for those whose use is consistent and always correct.
Data adapted from: Contraceptive Technology, 20th edition, 2011 and Trussell J. Contraceptive failure in the United States. Contraception 2011; 83:397.