Variability in the phases of the menstrual cycle.

@article{Fehring2006VariabilityIT,
  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},
  year={2006},
  volume={35 3},
  pages={
          376-84
        }
}
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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References

SHOWING 1-10 OF 40 REFERENCES

The timing of the “fertile window” in the menstrual cycle: day specific estimates from a prospective study

Only about 30% of women is the fertile window entirely within the days of the menstrual cycle identified by clinical guidelines—that is, between days 10 and 17; most women reach their fertile window earlier and others much later.

Normal variation in the length of the luteal phase of the menstrual cycle: identification of the short luteal phase

Normal probability plots were used to assess the homogeneity of a population of 327 luteal phases from apparently ovulatory menstrual cycles and it was estimated that all cycles with aLuteal phase 9 days were abnormal, and that 74%, 22% and 2% respectively of cycles with luteals of 10, 11 and 12 days were also abnormal.

Variation of the human menstrual cycle through reproductive life.

Determining the pattern of variation in menstrual history for anticipated intervals needs further study, and the practice of birth control through the use of rhythm methods alone must introduce elements of uncertainty which are serious problems.

The length and variability of the human menstrual cycle.

Variability of menstrual-cycle lengths is highest for women under 25 years of age and declines steadily to reach a minimum for ages 35 to 39, then followed by a slight increase for women aged 40 to 44, according to the Center for Population Research.

Accuracy of the peak day of cervical mucus as a biological marker of fertility.

Characteristics of natural conceptual cycles occurring in a prospective study of sex preselection: fertility awareness symptoms, hormone levels, sperm survival, and pregnancy outcome.

The birth sex ratio favored males when intercourse preceded ovulation/fertilization by two days or longer, and while this association was statistically significant, the number of pregnancies involved is too small to conclude that the relationship is real.

Calendar rhythm and menstrual cycle range.

2316 women (15-44 years) contributing a minimum of 10 cycles for a total of 30655 cycles were evaluated to assess their individual cycle variations and to determine what percentage were suitable for

Association between psychological stress and menstrual cycle characteristics in perimenopausal women.

Cycle characteristics after discontinuation of oral contraceptives

Cycle disturbances after discontinuing OCs were reversible but the time of regeneration took up to 9 months (significant) or even longer (not significant).