Change: There were only format changes (bold, italics, etc.) in this version. See this version for details. (Word count: 112)

Change:  vaginal childbirth) 16 Sponge with spermicide (after vaginal childbirth) 32 Cervical cap (no previous vaginal childbirth) 16 Cervical cap (after vaginal delivery) 32 Periodic abstinence and fertility awareness methods 25 25 Vasectomy Fewer than 1 Tubal ligation or tubal implants Fewer than 1 No birth control 85 85   View changes from previous version. (Word count: 112)

Change: Number of unplanned pregnancies among 100 typical users Hormonal Combination birth control pills 8 Injections (Depo-Provera) 3 Transdermal patch 8 Progestin-only pills (mini-pills) 8 Vaginal ring 8 IUD Levonorgestrel (LNg 20) IUD Fewer than 1 Copper T 380-A IUD Fewer than 1 Barrier methods Condom, male 15 Withdrawal 27   View changes from previous version. (Word count: 122)