Evidence map›Paper›PMID 22247455›Full record

ArticleInvestigative ophthalmology & visual science2012

The association between glaucoma prevalence and supplementation with the oxidants calcium and iron.

Sophia Y Wang, Kuldev Singh, Shan C Lin

Abstract read
In one paragraph

Article in Investigative ophthalmology & visual science, 2012. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 30 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
30citing papers in PubMed, 2 pooled it
–field-weighted citation impact
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

30 citing papers in PubMed, 2 syntheses or guidelines pooled it.

  1. Pooled it
  2. Modifiable factors in the management of glaucoma: a systematic review of current evidence.Graefe's archive for clinical and experimental ophthalmology = Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie · 2017
    Pooled it
  3. Review
  4. Article
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  9. Article
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  12. Article
  13. Neuroprotective Effects of Transferrin in Experimental Glaucoma Models.International journal of molecular sciences · 2022
    Article
  14. Oxidative Stress in Optic Neuropathies.Antioxidants (Basel, Switzerland) · 2021
    Review
  15. Review
  16. Review
  17. Article
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  20. Proteomic profiling reveals crucial retinal protein alterations in the early phase of an experimental glaucoma model.Graefe's archive for clinical and experimental ophthalmology = Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie · 2017
    Article
4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

3 authors.

Sophia Y WangDepartment of Ophthalmology, University of California, San Francisco, California, USA.
Kuldev Singh
Shan C Lin

Funding

Rapid-Prototyping and Design CoreP30EY002162 · NEI · UNIVERSITY OF CALIFORNIA, SAN FRANCISCO · PI LAKKARAJU, APARNA · 1985 to 2024
$16.8M
Clinical and Transtional Science InstituteTL1RR024129 · NCRR · UNIVERSITY OF CALIFORNIA, SAN FRANCISCO · PI JOHNSTON, S. CLAIBORNE · 2006 to 2011
$2.0M
NCRR NIH HHS TL1 RR024129NEI NIH HHS EY002162NEI NIH HHS P30 EY002162
6 · The paper itself

Abstract

purposeTo investigate the relationship between supplementary consumption of the oxidants calcium and iron and the prevalence of glaucoma.

methodsThis cross-sectional study included 3833 participants in the National Health and Nutrition Examination Survey (NHANES) for 2007 and 2008, ≥ 40 years of age, who reported a presence or absence of glaucoma. Participants were interviewed regarding the use of dietary supplements and antacids during the preceding 30-day period. Data pertaining to the supplementary intake of calcium and iron was aggregated and divided into quintiles. Information regarding the presence or absence of glaucoma and demographics, comorbidities, and health-related behavior was obtained via interview.

resultsParticipants who consumed ≥ 800 mg/d of supplementary calcium or ≥ 18 mg/d of supplementary iron had significantly higher odds of having been diagnosed with glaucoma than did those who had not consumed supplementary calcium or iron, after adjustment for potential confounders (odds ratio [OR] 2.44, 95% confidence interval [CI] 1.25-4.76 for calcium; OR 3.80, 95% CI 1.79-8.06 for iron). Concurrent consumption of both calcium and iron above these levels was associated with still greater odds of having been diagnosed with glaucoma (OR 7.24, 95% CI 2.42-21.62). A clear dose-response relationship between quintiles of supplementary calcium or iron intake and glaucoma prevalence was not found.

conclusionsThese results suggest that there may be a threshold intake of iron and calcium above which there is an increased risk of development of glaucoma. Prospective longitudinal studies are needed, to assess whether oxidant intake is a risk factor for development and progression of glaucoma.

Indexed as

AgedCalcium, DietaryCross-Sectional StudiesDietary SupplementsFemaleGlaucomaHumansIron, DietaryMaleMiddle AgedNutrition SurveysPrevalenceRisk FactorsUnited StatesCalcium, DietaryIron, Dietary

Identifiers

PMID22247455
PMCPMC3317417

What OpenQuestion holds

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Registered trials

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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.