ABSTRACT
PIP: 876 women were followed over a 3975-woman-month period after implantation of a single silastic capsule containing 40 mg of norethindrone acetate. Data were analyzed by a life-table method with 3 cut-off dates. Net cumulative pregnancy rate until 7 months was 2.3/100, whereas it rose to 3.9/100 after 8 months of implantation. Net cumulative termination rates rose from .7-10.9 at the end of 7 months and reached 13.6 after 8 months. Removal rates for planned pregnancy, personal, and medical reasons after 8 months were .6, 1.2, and 5.7, respectively. 1.4/100 requested implant removals in preparation for sterilization procedures. Expulsion occurred at a rate of .8/100 at the end of 8 months. The continuation rate was 86.4/100 after 8 months. Menstrual pattern abnormalities showed a reduction with time. This implant seems an acceptable long-term contraception alternative.^ieng
