Which contraceptive method has a failure rate of less than 25%?
a. Standard days c. Postovulation
b. Periodic abstinence d. Coitus interruptus
ANS: A
The standard days variation on the calendar method has a failure rate of 12%. The periodic abstinence method has a failure rate of 25% or greater. The postovulation method has a failure rate of 25% or greater. The coitus interruptus method has a failure rate of 27% or greater.
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