

The purpose of this program is to predict

    - the probable day of ovulation
    - the probable beginning of the next menstrual cycle
    - and the probable fertile days of the next cycle;

  it does also determine the average cycle length. To conduct this it is
  necessary to obtain information on previous menstruation cycles.
  If this information only includes the beginning days of the last 6 to 12
  menstrual periods, all the results will be based on the so called "Calendar
  Method". Should it be the case that information on the body temperature
  within the time span of these cycles is available, the probable day of ovu-
  lation and the potential fertile phase of the next cycle will also be cal-
  culated by the "Temperature Method". Latter requires especially information
  on body temperature in the first two thirds of the respective cycle.
  If you don't have any data, it could generally be said:

  - average cycle length:      28.5 +/- 3.18  days
  - mean length of bleeding:   5.0  days
  - probable day of ovulation: 15 days after beginning of bleeding
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