Normal variation in the length of the follicular phase of the menstrual cycle: effect of chronological age

Lenton EA; Landgren BM; Sexton L; Harper R

doi:10.1111/j.1471-0528.1984.tb04830.x

Menstrual Cycle Cycle Across the Lifespan

Normal variation in the length of the follicular phase of the menstrual cycle: effect of chronological age

Lenton EA, Landgren BM, Sexton L, Harper R

Published July 1984 British journal of obstetrics and gynaecology

DOI 10.1111/j.1471-0528.1984.tb04830.x PMID 6743609

Abstract

Normal probability plots were used to analyse the distribution of follicular phase length in a population of 293 apparently ovulatory menstrual cycles from women aged between 18 and 39 years. The length of the follicular phase was defined as the interval (in days) from the onset of menstruation up to, but not including, the day of the LH peak. Follicular phase length appeared to be log-normally distributed and graphical inspection of the probability plot suggested that the geometric mean (and 95% confidence limits) of follicular phase length in this study group was 12.9 (10.3 to 16.3) days. There was a significant decrease (P less than 0.001) in follicular phase length with chronological age, from 14.2 days in women aged 18-24 years to 10.4 days in women aged 40-44 years.

Topics

Menstrual Cycle › Cycle Across the Lifespan › Cycle and General Health · Reproductive Endocrinology › Ovulation Physiology › Follicular Development · Longevity and Reproductive Aging › Reproductive Aging › Cycle Changes With Age

PMID 6743609 6743609 DOI 10.1111/j.1471-0528.1984.tb04830.x 10.1111/j.1471-0528.1984.tb04830.x Lenton et al. 1984, Lenton 1984

Normal variation in the length of the follicular phase of the menstrual cycle: effect of chronological age

Abstract

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