Evidence map›Paper›PMID 32307019›Full record

ArticleBMC women's health2020

Is menopause still evolving? Evidence from a longitudinal study of multiethnic populations and its relevance to women's health.

Shirley Chan, Alyssa Gomes, Rama Shankar Singh

Open access · goldAbstract read
In one paragraph

Article in BMC women's health, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 34 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
34citing papers in PubMed, 2 pooled it
3.1field-weighted citation impact, top 7% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

34 citing papers in PubMed, 2 syntheses or guidelines pooled it, 45 citations in OpenAlex.

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  5. Evolution of the highest fidelity DNA replication systems.bioRxiv : the preprint server for biology · 2026
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

3 authors at 1 institution in 1 country.

Shirley ChanDepartment of Biology, McMaster University, Hamilton, Ontario, Canada.
Alyssa GomesDepartment of Biology, McMaster University, Hamilton, Ontario, Canada.
Rama Shankar SinghDepartment of Biology, McMaster University, Hamilton, Ontario, Canada. singh@mcmaster.ca.
McMaster University · CA

Funding

Natural Sciences and Engineering Research Council of Canada RSS 245
6 · The paper itself

Abstract

backgroundTo reflect on the impact of changing patterns of delayed marriage and reproduction and to seek evidence as to whether menopause is still evolving, characteristics of the menopause transition were investigated within and between ethnic populations in this study.

methodsA cross-sectional analysis was conducted using data on 747 middle-aged women obtained from the Study of Women's Health Across the Nation (SWAN) from 1996 to 2008. The ethnic groups included: Afro-American, Chinese, Japanese, Caucasian, and Hispanic. Perimenopause age and duration, menopause age, and hormonal indicators of menopause were examined across five ethnicities.

resultsWe found a similar window of menopause age within populations, but no significant difference in perimenopause and menopause age between populations. The rate of increase of follicle-stimulating hormone and testosterone differed significantly in Hispanics and African-Americans during the menopause transition period.

conclusionsThe broad window of variation in age at menopause within the population and the absence of significant differences between populations, in combination with population variation in menopause symptoms, suggest that menopause is a relatively recently evolved and still evolving trait. Under the mate choice theory of menopause, menopause is the result of the accumulation of infertility mutations in older women due to men's preference for younger mates. We propose a shifting mate choice-shifting menopause model which posits that, as the age of mate choice/marriage shifts to older ages, so will the age at menopause, and that menopause is a transient phase of female fertility; it can de-evolve, be delayed, if not disappear completely. Integrated longitudinal menopausal studies linked with genomics and hormonal studies on diverse ethnic populations can provide valuable information bearing on women's health and personalized medicine.

Indexed as

AgedCross-Sectional StudiesEthnicityFemaleFollicle Stimulating HormoneHumansLongitudinal StudiesMenopauseMiddle AgedTestosteroneWomen's HealthFollicle Stimulating HormoneTestosteroneFertilityMate choiceMenopauseMenstruationPerimenopauseSex-hormones

Identifiers

PMID32307019
PMCPMC7168978
OpenAlexW3016963314

What OpenQuestion holds

Textmetadata
LicenceCC BY
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.