The number of U.S. women who use long-acting reversible contraceptive devices is soaring, according to a new federal report. The National Center for Health Statistics this week released findings from a national survey based on personal interviews of about 10,400 women. Whereas the birth control pill and the condom are the most commonly used methods, the number of women using long-acting implants such as intrauterine devices (IUDs)—the third-most common method—has gone up dramatically since the beginning of this century.