Evidence map›Paper›PMID 15377766›Full record

ArticleOccupational and environmental medicine2004

Silicosis prevalence and exposure-response relations in South African goldminers.

G J Churchyard, R Ehrlich, J M teWaterNaude, L Pemba, K Dekker, M Vermeijs, N White, J Myers

Erratum issuedOpen access · bronzeAbstract read
In one paragraph

Article in Occupational and environmental medicine, 2004. The graph could read no effect estimate from its abstract, so it casts no vote on the map. An erratum has been issued. Cited by 29 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
29citing papers in PubMed, 1 pooled it
3.2field-weighted citation impact, top 9% 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

29 citing papers in PubMed, 1 synthesis or guideline pooled it, 99 citations in OpenAlex.

  1. Pooled it
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  5. Silicosis in Zambian ex-copper miners: A cross-sectional study.African journal of thoracic and critical care medicine · 2025
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4 · The record

Corrections and comments

  • Erratum issued
5 · Who and what money

Authors and funding

8 authors at 3 institutions in 1 country.

G J ChurchyardAurum Health Research, Orkney, South Africa.
R Ehrlich
J M teWaterNaude
L Pemba
K Dekker
M Vermeijs
N White
J Myers
University of Cape Town · ZAAngloGold Ashanti (South Africa) · ZAAurum Institute · ZA

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

aimsTo measure the prevalence of silicosis among black migrant contract workers on a South African goldmine and to investigate exposure-response relations with silica dust.

methodsIn a cross sectional study, 520 black goldminers (aged >37 years) were interviewed and had chest radiographs taken. Silicosis was defined as International Labour Organisation Classification radiological profusion of 1/1 or greater.

resultsMean length of service was 21.8 years (range 6.3-34.5). The mean intensity of respirable dust exposure was 0.37 mg/m3 (range 0-0.70) and of quartz 0.053 mg/m3 (range 0-0.095). The prevalence of silicosis was 18.3-19.9% depending on reader. Significant trends were found between the prevalence of silicosis and length of service, mean intensity of exposure, and cumulative exposure.

conclusionResults confirm a large burden of silicosis among older black workers in the South African goldmining industry, which is likely to worsen as such miners spend longer periods in continuous employment in dusty jobs. An urgent need for improved dust control in the industry is indicated. If the assumption of stability of average dust concentrations on this mine over the working life of this group of workers is correct, these workers developed silicosis while exposed to a quartz concentration below the recommended occupational exposure limit (OEL) of 0.1 mg/m3. This accords with a mounting body of evidence that an OEL of 0.1 mg/m3 is not protective against silicosis.

Indexed as

GoldMiningBlack PeopleCross-Sectional StudiesDustHumansMaleMiddle AgedOccupational ExposurePrevalenceSilicon DioxideSilicosisSouth AfricaTime FactorsDustGoldSilicon Dioxide

Identifiers

PMID15377766
PMCPMC1740677
OpenAlexW2169170378

What OpenQuestion holds

Textmetadata
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.