title: Efficacy studies in natural family planning: issues and management implications illustrated with data from five studies.
abstract: Studies of method effectiveness must be carefully assessed for comparability of findings. Several parameters are identified that are important in the assurance of comparable results. This article discusses these issues with the use of data from previously published studies and emphasizes the management implications of use-effectiveness data.
authors.affiliation: Department of Obstetrics and Gynecology, Georgetown University, Washington, DC 20007.
authors.forename: M H
authors.initials: MH
authors.lastname: Labbok
authors.forename: H
authors.initials: H
authors.lastname: Klaus
authors.forename: A
authors.initials: A
authors.lastname: Perez
mesh_terms: D003627:Data Interpretation, Statistical; D005193:Family Planning Services / Q000379:methods*; D005260:Female; D006801:Humans; D015993:Life Tables; D011247:Pregnancy