| Literature DB >> 1755470 |
J Trussell1, L Grummer-Strawn.
Abstract
Reanalysis of data on the ovulation method of natural family planning collected by the World Health Organization yields the following conclusions. The method is effective during perfect (correct and consistent) use, with a first-year probability of failure of 3.4%. However, it is extremely unforgiving of imperfect use, with a first-year probability of failure of 84.2% if the method is not used correctly. During the initial year, 87% of the cycles were characterized by perfect use. Nevertheless, the 13% of cycles characterized by imperfect use had a tremendous impact on the overall failure rate. During the first year of typical use 22.5% of the women in the clinical trial became accidentally pregnant.Entities:
Keywords: Acceptance Process; Acceptors; Acceptors, New; Americas; Behavior; Cervical Mucus Method; Coital Frequency; Contraception; Contraception Failure; Contraceptive Effectiveness; Contraceptive Usage; Data Adjustment; Decision Making; Demographic Analysis; Developed Countries; Error Sources; Family Planning; Family Planning Programs; Family Planning, Behavioral Methods; Life Table Method; Measurement; Natural Family Planning; New Jersey; North America; Northern America; Pearl's Formula; Perfect Contraceptives; Psychological Factors; Research Methodology; Sex Behavior; Statistical Studies; Stress; Studies; Theoretical Effectiveness; United States; Use-effectiveness; User Compliance
Mesh：
Year: 1991 PMID： 1755470 DOI： 10.1016/s0002-9378(11)90581-x
Source DB: PubMed Journal: Am J Obstet Gynecol ISSN： 0002-9378 Impact factor: 8.661