The Effectiveness of FAM

The theoretical effectiveness of FAM, like most conventional methods of contraception, is 98-99%. Theoretical or method effectiveness is another way of stating “perfect use.” Actual user effectiveness, or imperfect use, is between 80-95%. The rate depends on the following factors:

    • The amount of experience and skill the user of the method has
    • The extent to which the woman/couple follow the method rules correctly
    • The way the method was learned: did the woman or couple receive instruction and follow-up from a certified teacher (vs. self-taught, learning from a book)
    • If the couple abstains from intercourse during the fertile phase or whether they use one or two back-up (barrier) methods at this time
    • Motivation to prevent pregnancy
    • Satisfaction with the method
    • Partner cooperation and trust

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