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Published on: October 16, 2013
Reliability and validity of key feature cases for the self-assessment of colon and rectal surgeons
Judith L Trudel1, Georges Bordage, Steven M Downing
1Division of Colon and Rectal Surgery, Department of Surgery, University of Minnesota, Minneapolis, Minnesota, USA. jtrudel@colonrectal.org
Objective:
The purpose of this study was to determine the reliability and validity of the scores from "key feature" cases in the self-assessment of colon and rectal surgeons.
Background:
Key feature (KF) cases specifically focus on the assessment of the unique challenges, critical decisions, and difficult aspects of the identification and management of clinical problems in practice. KF cases have been used to assess medical students and residents but rarely for specialists.
Methods:
Responses from all 256 participants taking the American Society of Colon and Rectal Surgeons (ASCRS) Colon and Rectal Surgery Educational Program (CARSEP) V Self-assessment Examination (SAE) from 1997 to 2002 were scored and analyzed, including score reliability, item analysis for the factual (50 multiple-choice questions (MCQ)) and applied (9 KF cases) knowledge portions of the SAE, and the effect of examination preparation, examination setting, specialization, Board certification, and clinical experience on scores.
Results:
The reliability (Cronbach alpha) of the scores for the MCQ and KF components was 0.97 and 0.95, respectively. The applied KF component of the SAE was more difficult than the factual MCQ component (0.52 versus 0.80, P < 0.001). Mean item discrimination (upper-lower groups) was 0.59 and 0.66 for the MCQ and KF components, respectively. Taking the test at the annual meeting was harder than at home (0.41 versus 0.81, P < 0.001). Content-related validity evidence for the KF cases was supported by mapping KF cases onto the examination blueprint and by judgments from expert colorectal surgeons about the challenging and critical nature of the KFs used. Construct validity of the KF cases was supported by incremental performance related to types of practice (general, anorectal, and colorectal), levels and types of Board certification, and years of clinical experience.
Conclusions:
The self-assessment of surgical specialists, in this case colorectal surgeons, using KF cases is possible and yielded reliable and valid scores.
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