Cited by 375Menstrual Health and DisordersHypothalamic control of reproductive hormonesReproductive Health and Contraception

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The Length and Variability of the Human Menstrual Cycle

Chiazze, Leonard·1968·JAMA: The Journal of the American Medical Association

DOI 10.1001/jama.1968.03140060001001

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Abstract

The Center for Population Research collected 30,655 recorded menstrual cycles from 2,316 women. Ninety-five percent of all cycles were between 15 and 45 days long. The mean and standard deviations for the total number of cycles were 29.1 and 7.46, respectively. Cycle lengths between 15 and 45 days averaged 28.1 days with a standard deviation of 3.95 days. 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. It is then followed by a slight increase for women aged 40 to 44. The pattern of variability by age is demonstrated equally well by the percent of cycles between 25 and 31 days in length as by the standard deviation.

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VARIATION OF THE HUMAN MENSTRUAL CYCLE THROUGH REPRODUCTIVE LIFE
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Authors: Chiazze, L.
Corresponding author: Chiazze, Leonard
Venue: JAMA: The Journal of the American Medical Association
Publisher: American Medical Association (AMA)
Published: 1968-02-05
Volume: 203
Issue: 6
Pages: 377
ISSN: 0002-9955 (ISSN-L)
0098-7484
DOI: 10.1001/jama.1968.03140060001001
OpenAlex: W2027829650
Cited by: 374
References: 12
Citations by year: 2026: 4 · 2025: 8 · 2024: 4 · 2023: 10 · 2022: 11 · 2021: 10 · 2020: 14 · 2019: 11 · 2018: 7 · 2017: 7 · 2016: 10 · 2015: 15 · 2014: 12 · 2013: 21 · 2012: 12
FWCI: 27.35
Type: journal article
Language: en
Open access: closed
Locations: JAMA (publishedVersion)
PubMed (publishedVersion)
Topics: Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Menstrual Health and Disorders
Health Sciences › Medicine › Reproductive Medicine › Hypothalamic control of reproductive hormones
Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Reproductive Health and Contraception
Keywords: menstrual cycle length, menstrual cycle variability, cycle length distribution, age differences, women's reproductive health
MeSH terms: Adult, Age Factors, Female, Humans, Menopause, Menstruation, Middle Aged, Prospective Studies, Statistics as Topic, Time Factors

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The Length and Variability of the Human Menstrual Cycle

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