| Literature DB >> 7308503 |
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Abstract
A five-country prospective study was undertaken to determine the effectiveness of the ovulation method of natural family planning. After successful completion of a teaching phase of three cycles, 725 subjects entered a 13-cycle effectiveness phase and contributed 7514 cycles of observation. The overall cumulative net probability of discontinuation for the effectiveness study after 13 cycles was 35.6%, 19.6% due to pregnancy. Pregnancy rates per 100 woman-years calculated using the modified Pearl index were as follows: conscious departure from the rules of the method, 15.4; inaccurate application of instructions, 3.5; method failure, 2.8; inadequate teaching, 0.4; and uncertain, 0.5.Entities:
Keywords: Americas; Asia; Behavior; Central America; Cervical Mucus Method; Contraception; Contraception Failure--statistics; Contraceptive Effectiveness; Contraceptive Usage; Developed Countries; Developing Countries; El Salvador; Europe; Evaluation; Examinations And Diagnoses; Family Planning; Family Planning, Behavioral Methods; Fertile Period; India; Ireland; Laboratory Examinations And Diagnoses; Laboratory Procedures; Latin America; Natural Family Planning; New Zealand; North America; Northern Europe; Oceania; Ovulation Detection; Pearl's Formula; Philippines; Prospective Studies; Psychosocial Factors; Reproduction; Research Methodology; Southeastern Asia; Southern Asia; Studies; Use-effectiveness; Who
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Year: 1981 PMID： 7308503 DOI： 10.1016/s0015-0282(16)45856-5
Source DB: PubMed Journal: Fertil Steril ISSN： 0015-0282 Impact factor: 7.329