Final answer:
The failure rate of the transdermal contraceptive patch, Ortho Evra, reflects its effectiveness in preventing pregnancy, with lower rates for perfect use and higher rates with typical use. While the material does not provide specific numbers for Ortho Evra, it stresses the importance of the failure rate as a measure over a twelve-month period, highlighting the difference between perfect and typical use of contraception methods.
Step-by-step explanation:
The failure rate of the transdermal contraceptive patch, often known by its brand name Ortho Evra, plays a crucial role in its effectiveness as a birth control method. This patch releases hormones progestin and estrogen to prevent ovulation and thicken cervical mucus. While exact failure rates are not provided in the reference material, the effectiveness of contraception is typically expressed in terms of failure rates with both perfect and typical use. Perfect use indicates a lower failure rate, often considerably less than with typical use, which can account for human error or incorrect application.
It's important to remember that hormonal methods like Ortho Evra are considered more reliable when compared to methods like withdrawal, which has a failure rate of about 22 percent with typical use. Stated failure rates are usually based on a twelve-month period of method use and include typical use rather than the ideal failure rate possible with perfect adherence to the method's use.
Individuals should consult healthcare professionals to discuss the most suitable birth control options and understand Ortho Evra's potential risks and expected pregnancy prevention rates.