ANALYSIS OF FAILURE OF NATURAL FAMILY-PLA NNING - AN ANALYSIS CARRIEDOUT OVER 7007 CYCLES

Materials and Methods: The analysis concerned 626 users using NFP in o rder to avoid a conception during a total of 6740 cycles. Participatio n in the study did not interfere with their plan of conception, and th ey were invited to behave, as far as possible, as though they ignored the study Of these 626 couples, 530 were french, 61 belgian and 35 swi ss. On the whole, 39,3 % used birth control to limit births and 60,7 % to space them. Results: The observed pregnancy rates are 1.13, 6.47 a nd 17.58 for one year in actuarial method respectively for method, met hod + user and total pregnancy rate. The pregnancy rate was higher for women before 35 years (RR:3.8; 95 p100 confidence interval:1.4-10.3), during the six months after delivery (RR:2,5; 1.0-4.6) and, of course , for couples with inprotected sexual intercourse in fertile phase (RR :4.8; 2.1-11.2). Discussion: NFP can be placed among methods of great theorical effectiveness. But pregnancies as a result of intercourses d uring the fertile phase despite its identification are frequent:couple s have to be informed.