Final answer:
The effectiveness of contraception methods ranges from behavioral with high failure rates, such as rhythm and withdrawal, to more effective barrier methods like condoms, and highly effective hormonal methods like birth control pills and IUDs.
Step-by-step explanation:
Contraception Effectiveness
When considering the effectiveness of different contraception methods, several factors come into play, including the method's failure rate and whether the method is behavioral or involves physical barriers or hormones. Behavioral methods like the rhythm (fertility awareness) method and withdrawal are typically considered the least effective due to higher failure rates and the need for strict compliance. Barrier methods, such as condoms, are more effective, especially when combined with spermicides. Hormonal contraceptives, including the birth control pill, and IUDs (intrauterine devices) are generally more reliable in preventing pregnancy.
Arranging the methods from least to most effective typically, it would be: fertility awareness method, withdrawal, male condom, then birth control pill. The most effective reversible contraceptive method mentioned, which has higher compliance and effectiveness, is the IUD.
If a contraceptive had a 35 percent failure rate, it would not be considered highly effective. For comparison, methods like IUDs or hormonal pills have much lower typical failure rates.