American journal of obstetrics and gynecology
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Am. J. Obstet. Gynecol. · Oct 1981
Randomized Controlled Trial Comparative Study Clinical TrialA randomized prospective study of the use-effectiveness of two methods of natural family planning.
The final results of a prospective comparative study of two methods of natural family planning indicate a significant difference in the 12 month net cumulative pregnancy rates between the ovulation and symptothermal methods. These differences are on the order of two to one in favor of the symptothermal method. ⋯ Dropout rates for both methods were high. Lack of interest or dissatisfaction with the method was the major reason for dropout training while pregnancy or desire for pregnancy were the major reasons for dropout during the formal phase of the study.