Evidence map›Paper›PMID 36430100›Full record

ReviewInternational journal of environmental research and public health2022

Benefits of Participation in Clinical Trials: An Umbrella Review.

Amira Bouzalmate-Hajjaj, Paloma Massó Guijarro, Khalid Saeed Khan, Aurora Bueno-Cavanillas, Naomi Cano-Ibáñez

Abstract readReview
In one paragraph

Review in International journal of environmental research and public health, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 38 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
38citing 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

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

  1. Patient and public involvement in randomized trials of lifestyle intervention among pregnant women with obesity: An umbrella review.International journal of gynaecology and obstetrics: the official organ of the International Federation of Gynaecology and Obstetrics · 2026
    Pooled it
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  19. Latine Immigrant Perspectives on Trust of Clinical Research.Hispanic health care international : the official journal of the National Association of Hispanic Nurses · 2025
    Article
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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

5 authors.

Amira Bouzalmate-HajjajDepartment of Preventive Medicine and Public Health, Faculty of Medicine, University of Granada, 18016 Granada, Spain.
Paloma Massó GuijarroDepartment of Preventive Medicine and Public Health, Faculty of Medicine, University of Granada, 18016 Granada, Spain.
Khalid Saeed KhanDepartment of Preventive Medicine and Public Health, Faculty of Medicine, University of Granada, 18016 Granada, Spain.ORCID 0000-0001-5084-7312
Aurora Bueno-CavanillasDepartment of Preventive Medicine and Public Health, Faculty of Medicine, University of Granada, 18016 Granada, Spain.ORCID 0000-0002-0649-3016
Naomi Cano-IbáñezDepartment of Preventive Medicine and Public Health, Faculty of Medicine, University of Granada, 18016 Granada, Spain.ORCID 0000-0002-3640-5486

Funding

Centro 284 de Investigación Biomédica en Red-Epidemiología y Salud Pública CIBERESP/CB06/02/1014Instituto de Salud Carlos III PI20/01532
6 · The paper itself

Abstract

Participation in randomised clinical trials (RCTs) entails taking part in the discovery of effects of health care interventions. The question of whether participants' outcomes are different to those of non-participants remains controversial. This umbrella review was aimed at assessing whether there are health benefits of participation in RCTs, compared to non-participation. After prospective registration (PROSPERO CRD42021287812), we searched the Medline, Scopus, Web of Science and Cochrane Library databases from inception to June 2022 to identify relevant systematic reviews with or without meta-analyses. Data extraction and study quality assessment (AMSTAR-2) were performed by two independent reviewers. Of 914 records, six systematic reviews summarising 380 comparisons of RCT participants with non-participants met the inclusion criteria. In two reviews, the majority of comparisons were in favour of participation in RCTs. Of the total of comparisons, 69 (18.7%) were in favour of participation, reporting statistically significant better outcomes for patients treated within RCTs, 264 (71.7%) comparisons were not statistically significant, and 35 (9.5%) comparisons were in favour of non-participation. None of the reviews found a harmful effect of participation in RCTs. Our findings suggest that taking part in RCTs may be beneficial compared to non-participation.

Indexed as

health changesnon-participantsparticipationrandomised controlled trialssystematic reviewsumbrella review

Identifiers

PMID36430100
PMCPMC9691211

What OpenQuestion holds

Textmetadata
LicenceCC BY
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.