Which of the following contraceptive methods has a failure rate of less than 25%?
1. Standard days
2. Periodic abstinence
3. Postovulation
4. Coitus interruptus
1
1. Correct. The standard days variation on the calendar method has a failure rate of 12%.
2. Incorrect. The periodic abstinence method has a failure rate of 25% or more. The standard days variation on the calendar method has a failure rate of 12%.
3. Incorrect. The postovulation method has a failure rate of 25% or more. The standard days variation on the calendar method has a failure rate of 12%.
4. Incorrect. The coitus interruptus method has a failure rate of 27% or more. The standard days variation on the calendar method has a failure rate of 12%.
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