Evidence map›Paper›PMID 32034025›Full record

ArticleBMJ open2020

Association of trajectory of body mass index with knee pain risk in Japanese middle-aged women in a prospective cohort study: the Japan Nurses' Health Study.

Ayumi Ito, Kunihiko Hayashi, Shosuke Suzuki, Yuki Ideno, Takumi Kurabayashi, Toru Ogata, Atsushi Seichi, Masami Akai, Tsutomu Iwaya

Open access · goldAbstract read
PubMed Full text at PMC Publisher
In one paragraph

Article in BMJ open, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
5citing papers in PubMed, 2 pooled it
2.2field-weighted citation impact, top 12% 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

5 citing papers in PubMed, 2 syntheses or guidelines pooled it, 18 citations in OpenAlex.

  1. Pooled it
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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

9 authors at 6 institutions in 1 country.

Ayumi ItoUnit of International and Community Health Sciences, Graduate School of Health Sciences, Gunma University, Maebashi, Japan.
Kunihiko HayashiUnit of International and Community Health Sciences, Graduate School of Health Sciences, Gunma University, Maebashi, Japan khayashi@gunma-u.ac.jp.ORCID 0000-0003-4648-3936
Shosuke SuzukiFaculty of Medicine, Gunma University, Maebashi, Japan.
Yuki IdenoCenter for Mathematics and Data Science, Gunma University, Maebashi, Japan.
Takumi KurabayashiDepartment of Obstetrics & Gynecology, Niigata City General Hospital, Niigata, Japan.
Toru OgataCenter for Sport Science and Health Promotion, Department of Rehabilitaion for the Movement Functions, National Rehabilitation Center for Persons with Disabilities, Tokorozawa, Japan.
Atsushi SeichiDepartment of Orthopaedic Surgery, Mitsui Memorial Hospital, Chiyoda-ku, Japan.
Masami AkaiGraduate School, International University of Health and Welfare Kohokai Group, Minato-ku, Japan.ORCID 0000-0002-9145-7158
Tsutomu IwayaNagano University of Health and Medicine, Nagano, Japan.
Gunma University · JPInternational University of Health and Welfare · JPMitsui Memorial Hospital · JPNagano University of Health and Medicine · JPNational Rehabilitation Center for Persons with Disabilities · JPNiigata City General Hospital · JP

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

objectivesTo investigate whether body mass index (BMI) trajectory, lifestyle and reproductive factors are associated with knee pain risk among middle-aged women.

designProspective study of the Japan Nurses' Health Study (JNHS).

settingThe JNHS investigates the health of female nurses in Japan. Biennial follow-up questionnaires are mailed to the participants.

participantsThe 7434 women aged over 40 years who responded to the 10-year self-administered follow-up questionnaire. PRIMARY OUTCOME MEASURE: Self-reported knee pain at the 10-year follow-up was the primary outcome. We analysed BMI (normal or overweight) trajectory data from a baseline survey to the 10-year follow-up survey using group-based trajectory modelling. Exposure measurements were BMI trajectory, BMI at age 18 years, lifestyle variables and reproductive history.

resultsBMI trajectories from baseline to the 10-year follow-up were divided into four groups: remained normal, remained overweight, gained weight or lost weight. At the 10-year follow-up, 1281 women (17.2%) reported knee pain. Multivariable logistic regression analysis revealed that compared with the remained normal group, multivariable-adjusted ORs (95% CI) of knee pain were 1.93 (1.60 to 2.33) for the remained overweight group, 1.60 (1.23 to 2.08) for the gained weight group and 1.40 (0.88 to 2.21) for the lost weight group. The attributable risk percent (95% CI) of the remained overweight group was 48.1% (37.3% to 57.0%) compared with the reference group of remained normal. Alcohol intake at baseline was significantly associated with knee pain.

conclusionsThe lost weight group had a lower risk than the remained overweight group and the gained weight group and did not carry statistically significant risks for knee pain. Weight reduction and maintaining a normal BMI in middle age was important for preventing knee pain in women.

Indexed as

Body Mass IndexAge FactorsArthralgiaFemaleFollow-Up StudiesHumansJapanKnee JointMiddle AgedObesityPain MeasurementProspective Studiesepidemiologykneemusculoskeletal disorderspublic health

Identifiers

PMID32034025
PMCPMC7045261
OpenAlexW3005269613

What OpenQuestion holds

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LicenceCC BY-NC
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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.