The Length and Variability of the Human Menstrual Cycle

Chiazze, Leonard

doi:10.1001/jama.1968.03140060001001

Cited by 310 publications

(166 citation statements)

References 8 publications

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“…This is then followed by a slight increase in women aged 40 to 44 years. The pattern of variability by age is shown to be as good as the percentage of cycles between 25 and 31 days in length due to the standard deviation [6].…”

Section: Methodsmentioning

confidence: 87%

Menstrual Cycle Length in Women Ages 20-30 years in Makassar

Azis

Kurnia

Hartati

et al. 2018

J. Phys.: Conf. Ser.

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Abstract. Menstrual cycle is a naturally occurring mechanism in a reproductive aged woman. The ability of a woman to identify the length of a menstrual cycle is important as a basis to determine the fertile period in the subsequent menstrual cycle. This research aimed to investigate the length of menstrual cycle of women in reproductive age. A regular menstrual cycle occurs in a regular pattern of length which can range from 21 to 35 days in adults. A subsequent cycle which occurs three to five days earlier or longer than the usual pattern would still be considered as normal. Meanwhile, a menstrual cycle which occurs twice in a month or once in more than two months would be considered as irregular cycle. The method implemented was an exploratory method through which menstruation periods of woman in reproductive age were recorded in three consecutive months. The research population was Biology students who are registered in academic year 2017. The participants were students who are registered in Reproduction and Animal Development subject. The data of menstrual period were collected from four study group which consists of 101 students. The result of data analysis on a total of 171 menstrual cycle showed that the average length of participants' menstrual cycle was 30.08 days. The total of participants showed regular and irregular length of menstrual cycle was 59.41% and 42.57% respectively.

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Section: Methodsmentioning

confidence: 87%

Menstrual Cycle Length in Women Ages 20-30 years in Makassar

Azis

Kurnia

Hartati

et al. 2018

J. Phys.: Conf. Ser.

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“…4 Cycle length varies most during the years immediately succeeding menarche (age <20 years) and during the perimenopausal transition (age >40 years), as these age ranges have the highest prevalence of anovulatory cycles. [5][6][7] The normal menstrual cycle is a manifestation of coordinated interplay within the hypothalamic-pituitary-ovarian (HPO) axis. During the follicular phase of the menstrual cycle, follicle-stimulating hormone (FSH) causes the ovarian follicles to produce estrogen from granulosa cells.…”

Section: The Normal Menstrual Cyclementioning

confidence: 99%

The medical management of abnormal uterine bleeding in reproductive-aged women

Bradley

Gueye

2016

American Journal of Obstetrics and Gynecology

133

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“…Researchers 4,5 proposed that the mean lengths of the follicular and luteal phase are approximately 14 days respectively, and that estrogen peaks at day 14 and remains at a relatively high level during the luteal phase, while progesterone peaks and fluctuates at a high level during the luteal phase. Thus, it is reasonable to define day 14 as the cutoff day, days 1 to 14 as the follicular phase, and days 15 to 31 as the luteal phase when designating the 1st day in menstruation as day 1, as described previously.…”

Section: Commentsmentioning

confidence: 99%

“…The menstrual cycle ranges between 15 to 45 days, averaging at 28 days with a standard deviation of 3.95 days. 4 The mean lengths of the follicular and luteal phase are 14.37 and 14.26 days, respectively, with tolerance limits of 11 to 17 days for each phase. 5 The 2 menstrual phases might provide distinct host milieu even in the same woman.…”

mentioning

confidence: 99%