title: Natural family planning use-effectiveness and continuation.
abstract: Numerous studies have been conducted to assess the use-effectiveness of natural family planning. However, because of imprecise definitions of terms, these studies show noncomparable results. Special effort is required to study natural family planning use-effectiveness by the same criteria as other family planning methods.
authors.affiliation: Department of Population Dynamics, School of Hygiene and Public Health, Johns Hopkins University, Baltimore, MD.
authors.forename: R T
authors.initials: RT
authors.lastname: Kambic
mesh_terms: D005193:Family Planning Services / Q000379:methods*; D005260:Female; D006801:Humans; D015993:Life Tables; D011247:Pregnancy