2017, Number 22
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Inv Ed Med 2017; 6 (22)
Analysis of an objective structured clinical examination in dentistry using generalisability theory
Espinosa-Vázquez O, Martínez-González A, Sánchez-Mendiola M, Leenen I
Language: Spanish
References: 45
Page: 109-118
PDF size: 136.59 Kb.
ABSTRACT
Introduction: Various studies have examined Objective Structured Clinical Examinations
(OSCEs) in Dentistry in order to accumulate validity evidence for their use as an assessment tool
of clinical competence in students. In this article, a newly designed OSCE in Dentistry (OSCE-D)
is introduced and discussion is presented on the results of an analysis from the perspective of
generalisability theory using data obtained from an application of the examination.
Method: An observational and cross-sectional study was conducted in the Faculty of Dentistry at
UNAM. One hundred and twenty pre-graduate students participated in an OSCE that consisted of
18 stations, with a duration of 6 min each, in the context of a fourth-grade Paediatric Dentistry
course. An analysis based on generalisability theory, with raters and stations being considered
as facets, identified the main sources of variability in the data.
Results: The overall mean (and standard deviation) of the OSCE score, across participants and
stations, was 44% (7%), with the station means varying between 23% and 63%. The generalisability
study showed that the facet of the raters explained a significant portion (13%) of the
variance in the station results, which was more than the clinical competence of the participants
(6%). The decision study produced a generalisability index of 0.63 and a dependability index of
0.55.
Conclusions: In view of the rather low reliability indices from the decision study, it is important
to make a further analysis of the OSCE-D so as to minimise the effect of sources that introduce
construct-irrelevant variance into the results. In particular, an adjustment of the stations may
be required, as well as a better standardising in the use of evaluation criteria by the raters.
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