Evidence map›Paper›PMID 34446479›Full record

ArticleBMJ open2021

When and how do adolescent girls in Japan become aware of premenstrual symptoms from menarche? A cross-sectional study among senior high school students.

Kana Yoshimi, Noriomi Matsumura, Takashi Takeda

Open access · goldAbstract read
In one paragraph

Article in BMJ open, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
3citing papers in PubMed, 1 pooled it
0.8field-weighted citation impact, top 26% 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

3 citing papers in PubMed, 1 synthesis or guideline pooled it, 9 citations in OpenAlex.

  1. Pooled it
  2. Article
  3. Article
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.

Kana YoshimiResearch Institute of Traditional Asian Medicine, Division of Women's Health, Kindai University Hospital, Osakasayama, Japan.ORCID 0000-0002-5089-8715
Noriomi MatsumuraDepartment of Obstetrics and Gynecology, Kindai University Faculty of Medicine Hospital, Osakasayama, Japan.
Takashi TakedaResearch Institute of Traditional Asian Medicine, Division of Women's Health, Kindai University Hospital, Osakasayama, Japan take@med.kindai.ac.jp.ORCID 0000-0003-2428-1946
Kindai University Hospital · JP

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

objectiveTo investigate the interval from menarche to the onset of premenstrual symptoms and its relationship with menarche age.

designCross-sectional school-based survey.

settingUrban areas of Sendai, the largest city in northeastern Japan.

participants1422 female Japanese 10th-12th grade senior high school students participated in the survey.

main outcome measuresThe time of awareness of premenstrual symptoms, and the interval from menarche to the onset of premenstrual symptoms.

results1290 students had menstruation and completed the whole survey. The median age at menarche was 12 years (IQR: 11-13 years). The prevalence of self-reported premenstrual symptoms was 49%. The median age at which students became aware of premenstrual symptoms was 15 years (IQR: 14-16 years). The median time from the onset of menarche to awareness of premenstrual symptoms was 2 years. This time was negatively correlated with menarche age (ρ=-0.47, p<0.001). A Cox proportional hazards regression analysis revealed that early menarche was significantly associated with a lower cumulative risk of developing premenstrual symptoms (OR: 0.73 (95% CI 0.58 to 0.91)).

conclusionsHigh school students in Japan began experiencing premenstrual symptoms at around 15 years old, and within 2 years of menarche. This study suggested that social factors other than hormonal factors, such as early menarche, might be associated with the onset of premenstrual symptoms.

Indexed as

MenarcheStudentsAdolescentCross-Sectional StudiesFemaleHumansJapanSchoolsSurveys and Questionnaireschild & adolescent psychiatryepidemiologygynaecology

Identifiers

PMID34446479
PMCPMC8395348
OpenAlexW3195311561

What OpenQuestion holds

Textmetadata
LicenceCC BY-NC
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.