title: Measuring natural family planning in terms of couple-years of protection.
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.
authors.affiliation: International Planned Parenthood Federation, 902 Broadway, New York, New York 10010.
authors.forename: L I
authors.initials: LI
authors.lastname: Cuervo
mesh_terms: D003267:Contraception; D005069:Evaluation Studies as Topic; D005193:Family Planning Services / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D013997:Time Factors