Cited by 77Heavy Metal Exposure and ToxicityEffects and risks of endocrine disrupting chemicalsToxic Organic Pollutants Impact

Pop, heavy metal and the blues: secondary analysis of persistent organic pollutants (POP), heavy metals and depressive symptoms in the NHANES National Epidemiological Survey

Open access
Berk, Michael, Williams, Lana J, Andreazza, Ana C, Pasco, Julie A, Dodd, Seetal, Jacka, Felice N, Moylan, Steven, Reiner, Eric J +1 more·2014·BMJ Open

Abstract

Objectives: Persistent environmental pollutants, including heavy metals and persistent organic pollutants (POPs), have a ubiquitous presence. Many of these pollutants affect neurobiological processes, either accidentally or by design. The aim of this study was to explore the associations between assayed measures of POPs and heavy metals and depressive symptoms. We hypothesised that higher levels of pollutants and metals would be associated with depressive symptoms. Setting: National Health and Nutrition Examination Survey (NHANES). Participants: A total of 15 140 eligible people were included across the three examined waves of NHANES. Primary and secondary outcome measures: Depressive symptoms were assessed using the nine-item version of the Patient Health Questionnaire (PHQ-9), using a cut-off point of 9/10 as likely depression cases. Organic pollutants and heavy metals, including cadmium, lead and mercury, as well as polyfluorinated compounds (PFCs), pesticides, phenols and phthalates, were measured in blood or urine. Results: Higher cadmium was positively associated with depression (adjusted Prevalence Ratios (PR)=1.48, 95% CI 1.16 to 1.90). Higher levels of mercury were negatively associated with depression (adjusted PR=0.62, 95% CI 0.50 to 0.78), and mercury was associated with increased fish consumption (n=5500, r=0.366, p<0.001). In addition, several PFCs (perfluorooctanoic acid, perfluorohexane sulfonic acid, perfluorodecanoic acid and perfluorononanoic acid) were negatively associated with the prevalence of depression. Conclusions: Cadmium was associated with an increased likelihood of depression. Contrary to hypotheses, many of persistent environmental pollutants were not associated or negatively associated with depression. While the inverse association between mercury and depressive symptoms may be explained by a protective role for fish consumption, the negative associations with other pollutants remains unclear. This exploratory study suggests the need for further investigation of the role of various agents and classes of agents in the pathophysiology of depression.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1136/bmjopen-2014-005142

Cites

68 of 68 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

3 of the 71 references couldn’t be matched to a known paper.

Cited by

Sorted by citations

Authors
Berk, M., Williams, L. J., Andreazza, A. C., Pasco, J. A., Dodd, S., Jacka, F. N., Moylan, S., Reiner, E. J., & Magalhaes, P. V. S.
Affiliations
  • Barwon Health (AU)
  • Deakin University (AU)
  • Centre for Addiction and Mental Health (CA)
  • Ministry of the Environment, Conservation and Parks (CA)
  • National Institute for Translational Medicine, Hospital de Clinicas de Porto Alegre, Porto Alegre, Brazil
Corresponding author
Berk, Michael
Venue
BMJ Open
Publisher
BMJ
Published
2014-07
Volume
4
Issue
7
Pages
e005142
ISSN
2044-6055 (ISSN-L)
OpenAlex
W2117785672
Cited by
77
References
71
Citations by year
2026: 2 · 2025: 7 · 2024: 9 · 2023: 12 · 2022: 8 · 2021: 4 · 2020: 7 · 2019: 7 · 2018: 4 · 2017: 9 · 2016: 4 · 2015: 3 · 2014: 1
FWCI
3.73
Type
journal article
Language
en
Open access
Licence
cc-by-nc
Locations
  • BMJ Open (publishedVersion, cc-by-nc)
  • PubMed Central (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
  • Minerva Access (University of Melbourne) (submittedVersion, cc-by-nc)
  • Deakin Research Online (Deakin University) (submittedVersion)
  • Figshare (submittedVersion, cc-by-nc)
  • HighWire Press Open Archive (submittedVersion)
  • LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas) (submittedVersion, cc-by-nc-sa)
Topics
  • Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Heavy Metal Exposure and Toxicity
  • Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Effects and risks of endocrine disrupting chemicals
  • Physical Sciences › Environmental Science › Health, Toxicology and Mutagenesis › Toxic Organic Pollutants Impact
Keywords
persistent organic pollutants, heavy metals, depressive symptoms, depression, cadmium, mercury, polyfluorinated compounds, fish consumption, lead, phthalates, pesticides, phenols, blood and urine biomarkers, environmental exposure
MeSH terms
Adult, Depression, Environmental Pollutants, Female, Health Surveys, Humans, Male, Middle Aged, Organic Chemicals, Metals, Heavy, Epidemiological Monitoring

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review