Measuring natural family planning in terms of couple-years of protection.

Cuervo, L I · Am J Obstet Gynecol · 1991

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Abstract

Couple-years protection is a summary index of contraceptive protection. Couple-years protection allows comparisons of natural family planning with other methods. One couple-year protection for condoms is equal to 1 couple-year protection for pills and 1 couple-year protection for natural family planning. Critical in the calculation of couple-year protection for natural family planning is average duration of use. A working group on natural family planning recommended that 2 years of use be used as average duration until more data are available.

Medical subject headings