Failure Rates

Failure rates are typically described as percentage of women experiencing an unintended pregnancy within the first year of use (Zeiman et al., 2007). Two failure rates are measured, as follows (Table 26-3):

Perfect-use failure rate refers to the percentage of women who become pregnant during the first year of use when the method is used correctly and consistently according to instructions.

Typical-use failure rate refers to the percentage of women who become pregnant during the first year of use, which includes both those who use the method correctly and consistently and those who do not.

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