Evidence map›Paper›PMID 33424461›Full record

ArticleJournal of the Medical Library Association : JMLA2021

Search methods for prognostic factor systematic reviews: a methodologic investigation.

Leah Boulos, Rachel Ogilvie, Jill A Hayden

Abstract read
In one paragraph

Article in Journal of the Medical Library Association : JMLA, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 10 papers, 3 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
10citing papers in PubMed, 3 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

10 citing papers in PubMed, 3 syntheses or guidelines pooled it.

  1. Normal polysomnography parameters in healthy children: a systematic review and meta-analysis.European respiratory review : an official journal of the European Respiratory Society · 2026
    Pooled it
  2. Pooled it
  3. Pooled it
  4. Article
  5. Article
  6. Review
  7. Article
  8. Review
  9. Review
  10. Review
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

3 authors.

Leah BoulosLeahM.Boulos@nshealth.ca, Evidence Synthesis Coordinator, Maritime SPOR SUPPORT Unit, Halifax, NS, Canada.ORCID https://orcid.org/0000-0002-9849-383X
Rachel OgilvieRachel.Ogilvie@dal.ca, Research Program Coordinator, Department of Community Health and Epidemiology, Dalhousie University, Halifax, NS, Canada.ORCID https://orcid.org/0000-0001-6789-7017
Jill A HaydenJHayden@dal.ca, Associate Professor, Department of Community Health and Epidemiology, Dalhousie University, Halifax, NS, Canada.ORCID https://orcid.org/0000-0001-7026-144X

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

objectiveThis study retroactively investigated the search used in a 2019 review by Hayden et al., one of the first systematic reviews of prognostic factors that was published in the Cochrane Library. The review was designed to address recognized weaknesses in reviews of prognosis by using multiple supplementary search methods in addition to traditional electronic database searching.

methodsThe authors used four approaches to comprehensively assess aspects of systematic review literature searching for prognostic factor studies: (1) comparison of search recall of broad versus focused electronic search strategies, (2) linking of search methods of origin for eligible studies, (3) analysis of impact of supplementary search methods on meta-analysis conclusions, and (4) analysis of prognosis filter performance.

resultsThe review's focused electronic search strategy resulted in a 91% reduction in recall, compared to a broader version. Had the team relied on the focused search strategy without using supplementary search methods, they would have missed 23 of 58 eligible studies that were indexed in MEDLINE; additionally, the number of included studies in 2 of the review's primary outcome meta-analyses would have changed. Using a broader strategy without supplementary searches would still have missed 5 studies. The prognosis filter used in the review demonstrated the highest sensitivity of any of the filters tested.

conclusionsOur study results support recommendations for supplementary search methods made by prominent systematic review methodologists. Leaving out any supplemental search methods would have resulted in missed studies, and these omissions would not have been prevented by using a broader search strategy or any of the other prognosis filters tested.

Indexed as

Abstracting and IndexingBibliometricsDatabases, BibliographicHumansInformation Storage and RetrievalMedical Subject HeadingsMeta-Analysis as TopicPeriodicals as TopicSystematic Reviews as Topic

Identifiers

PMID33424461
PMCPMC7772979

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.