combines basal body temperature (BBT), cervical methods, cervical position, and/or historical cycle data to prospectively and retrospectively identify the peri-ovulatory period
in its most effective form, 2 signs are used to 'double check' each phase as confirmation for the couple that the woman is unlikely to be fertile
typical-use unplanned pregnancy rates have been reported as low as 1% to 3% in Europe and India
however, unplanned pregnancy rates as high as 13% to 20% have also been reported for typical users of the Symptothermal Method
critics warn that combining signs and symptoms can overestimate the fertile phases by a couple of days or more. In contrast, because there is no requirement to abstain every other day before the fertile phase, the total abstinence time is approximately equivalent to cervical secretion methods
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