What is the effectiveness rate of Depo-Provera as a contraceptive method?

Depo-Provera is a highly effective form of hormonal contraception that is administered via an injection, typically given every three months. The effectiveness rate of Depo-Provera is approximately 99% with perfect use, meaning that in a population of women who use this method correctly and consistently, fewer than 1 in 100 will become pregnant within a year. This high effectiveness rate is primarily due to the method's nature; it removes the potential for human error associated with daily pill regimens or other methods requiring more frequent user intervention.

In contrast, other options represent lower levels of effectiveness. For instance, a 90% effectiveness rate suggests that a larger proportion of women would experience unplanned pregnancies, which is not supported by clinical data for Depo-Provera. Similarly, 85% and 95% effectiveness rates do not accurately reflect the comprehensive research indicating the superior reliability of this contraceptive method. Therefore, the choice of 99% is the correct reflection of the efficacy of Depo-Provera, making it one of the more reliable choices for contraception available on the market.