Variability in the phases of the menstrual cycle.

  title={Variability in the phases of the menstrual cycle.},
  author={Richard J. Fehring and Mary Schneider and Kathleen Mary Raviele},
  journal={Journal of obstetric, gynecologic, and neonatal nursing : JOGNN},
  volume={35 3},
OBJECTIVE To determine variability in the phases of the menstrual cycle among healthy, regularly cycling women. [] Key MethodPARTICIPANTS One hundred forty one healthy women (mean age 29 years) who monitored 3 to 13 menstrual cycles with an electronic fertility monitor and produced 1,060 usable cycles of data. MEASURES AND OUTCOMES: Variability in the length of the menstrual cycle and of the follicular, fertile, and luteal phases, and menses.

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