All of the following studies show an effectiveness rate of at least 99%.

Josef Roetzer, "The Sympto-Thermal Method: Ten Years of Change," Linacre Quarterly, 45:4(November, 1978), 358-374

Maclyn E. Wade, Phyllis McCarthy, et al., "A Randomized Prospective Study of the Use-Effectiveness of Two Methods of Natural Family Planning," American Journal of Obstetrics and Gynecology, 141:4 (October 15, 1981) 368-376

G.K. Doring and A. Socher, "Erfahrungen mit einer Sympto-Thermalen Methode zur Familienplanung," Gebertsh. u. Frauenhelik, 48(1988) 106-108.

 

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