Evidence map›Paper›PMID 31558462›Full record

ArticleBMJ open2019

Comparing single-best-answer and very-short-answer questions for the assessment of applied medical knowledge in 20 UK medical schools: Cross-sectional study.

Amir H Sam, Rachel Westacott, Mark Gurnell, Rebecca Wilson, Karim Meeran, Celia Brown

Abstract readComparative Study
In one paragraph

Article in BMJ open, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 35 papers.

0numbers the graph read from it
0cells of the map it votes in
35citing papers in PubMed
–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

35 citing papers in PubMed.

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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

6 authors.

Amir H SamFaculty of Medicine, Imperial College London, London, UK.ORCID 0000-0002-9599-9069
Rachel WestacottLeicester Medical School, University of Leicester, Leicester, UK.
Mark GurnellWellcome Trust-MRC Institute of Metabolic Science, University of Cambridge, Cambridge, UK.
Rebecca WilsonFaculty of Medicine, Imperial College London, London, UK.
Karim MeeranFaculty of Medicine, Imperial College London, London, UK.
Celia BrownWarwick Medical School (WMS), The University of Warwick, Coventry, UK Celia.Brown@warwick.ac.uk.ORCID 0000-0002-7526-0793

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

objectivesThe study aimed to compare candidate performance between traditional best-of-five single-best-answer (SBA) questions and very-short-answer (VSA) questions, in which candidates must generate their own answers of between one and five words. The primary objective was to determine if the mean positive cue rate for SBAs exceeded the null hypothesis guessing rate of 20%.

designThis was a cross-sectional study undertaken in 2018.

setting20 medical schools in the UK.

participants1417 volunteer medical students preparing for their final undergraduate medicine examinations (total eligible population across all UK medical schools approximately 7500).

interventionsStudents completed a 50-question VSA test, followed immediately by the same test in SBA format, using a novel digital exam delivery platform which also facilitated rapid marking of VSAs.

main outcome measuresThe main outcome measure was the mean positive cue rate across SBAs: the percentage of students getting the SBA format of the question correct after getting the VSA format incorrect. Internal consistency, item discrimination and the pass rate using Cohen standard setting for VSAs and SBAs were also evaluated, and a cost analysis in terms of marking the VSA was performed.

resultsThe study was completed by 1417 students. Mean student scores were 21 percentage points higher for SBAs. The mean positive cue rate was 42.7% (95% CI 36.8% to 48.6%), one-sample t-test against ≤20%: t=7.53, p<0.001. Internal consistency was higher for VSAs than SBAs and the median item discrimination equivalent. The estimated marking cost was £2655 ($3500), with 24.5 hours of clinician time required (1.25 s per student per question).

conclusionsSBA questions can give a false impression of students' competence. VSAs appear to have greater authenticity and can provide useful information regarding students' cognitive errors, helping to improve learning as well as assessment. Electronic delivery and marking of VSAs is feasible and cost-effective.

Indexed as

Clinical CompetenceLearningSchools, MedicalStudents, MedicalAcademic PerformanceCross-Sectional StudiesDecision MakingEducational MeasurementEducation, Medical, UndergraduateHumansKnowledgeSurveys and QuestionnairesUnited Kingdomapplied medical knowledgeAssessmentMEDICAL EDUCATION & TRAINING

Identifiers

PMID31558462
PMCPMC6773319

What OpenQuestion holds

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LicenceCC BY-NC
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.