Evidence map›Paper›PMID 33664065›Full record

ArticleBMJ open2021

Relationship between heavy metal exposure and type 2 diabetes: a large-scale retrospective cohort study using occupational health examinations.

Jun Ho Ji, Mi Hyeon Jin, Jung-Hun Kang, Soon Il Lee, Suee Lee, Sung-Hyun Kim, Sung Yong Oh

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 20 papers.

0numbers the graph read from it
0cells of the map it votes in
20citing papers in PubMed
3.5field-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

20 citing papers in PubMed, 42 citations in OpenAlex.

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  20. Molecular pathways dysregulated by PbToxicology research · 2022
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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

7 authors at 3 institutions in 1 country.

Jun Ho JiInternal Medicine, Samsung Changwon Hospital, Changwon, Gyeonsangnam-do, The Republic of Korea.
Mi Hyeon JinBiostatistics, Samsung Changwon Hospital, Changwon, Gyeonsangnam-do, The Republic of Korea.
Jung-Hun KangInternal Medicine, Gyeongsang National University College of Medicine, Jinju, Gyeongsangnam-do, The Republic of Korea.
Soon Il LeeInternal Medicine, Dankook University College of Medicine, Cheonan, Chungcheongnam-do, The Republic of Korea.
Suee LeeInternal Medicine, Dong-A University Medical Center, Busan, The Republic of Korea.
Sung-Hyun KimInternal Medicine, Dong-A University Medical Center, Busan, The Republic of Korea.
Sung Yong OhInternal Medicine, Dong-A University Medical Center, Busan, The Republic of Korea drosy@dau.ac.kr.ORCID http://orcid.org/0000-0002-8321-4113
Dong-A University · KRChangwon National University · KRGyeongsang National University · KR

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

objectivesTo investigate the associations between heavy metal exposure and serum ferritin levels, physical measurements and type 2 diabetes mellitus (DM).

designA retrospective cohort study.

settingChangwon, the location of this study, is a Korean representative industrial city. Data were obtained from medical check-ups between 2002 and 2018.

participantsA total of 34 814 male subjects were included. Of them, 1035 subjects with lead exposure, 200 subjects with cadmium exposure and the 33 579 remaining were assigned to cohort A, cohort B and the control cohort, respectively. Data including personal history of alcohol and smoking, age, height, weight, the follow-up duration, haemoglobin A1c (HbA1c), fasting blood sugar (FBS), ferritin levels, and lead and cadmium levels within 1 year after exposure were collected. PRIMARY OUTCOME MEASURE: In subjects without diabetes, changes in FBS and HbA1c were analysed through repeated tests at intervals of 1 year or longer after the occupational exposure to heavy metals.

resultsIn Cohort A, DM was diagnosed in 33 subjects. There was a significant difference in lead concentrations between the subjects diagnosed with DM and those without DM during the follow-up period (3.94±2.92 mg/dL vs 2.81±2.03 mg/dL, p=0.002). Simple exposure to heavy metals (lead and cadmium) was not associated with DM in Cox regression models (lead exposure (HR) 1.01, 95% CI: 0.58 to 1.77, p 0.971; cadmium exposure HR 1.48, 95% CI: 0.61 to 3.55, p=0.385). Annual changes in FBS according to lead concentration at the beginning of exposure showed a positive correlation (r=0.072, p=0.032).

conclusionOur findings demonstrated that simple occupational exposure to heavy metals lead and cadmium was not associated with the incidence of DM. However, lead concentrations at the beginning of the exposure might be an indicator of DM and glucose elevations.

Indexed as

Diabetes Mellitus, Type 2Metals, HeavyOccupational ExposureOccupational HealthCadmiumCohort StudiesHumansMaleRetrospective StudiesCadmiumMetals, Heavydiabetes & endocrinologyepidemiologysocial medicine

Identifiers

PMID33664065
PMCPMC7934714
OpenAlexW3135350513

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.