Assessing the validity of an OSCE developed to assess rare, emergent or complex clinical conditions in endocrinology & metabolism

BACKGROUND: Assessment of emergent, rare or complex medical conditions in Endocrinology and Metabolism (E&M) is an integral component of training. However, data is lacking on how this could be best achieved. The purpose of this study was to develop and administer an Objective Structured Clinical Examination (OSCE) for E&M residents, and to gather validity evidence for its use. METHODS: A needs assessment survey was distributed to all Canadian E&M Program Directors and recent graduates to determine which topics to include in the OSCE. The top 5 topics were selected using a modified Delphi technique. OSCE cases based on these topics were subsequently developed. Five E&M residents (PGY4-5) and five junior Internal Medicine (IM) residents participated in the OSCE. Performance of E&M and IM residents was compared and results were analyzed using a Generalizability study. Examiners and candidates completed a survey following the OSCE to evaluate their experiences. RESULTS: The mean score of IM and E&M residents was 41.7 and 69.3 % (p < 0.001), respectively, with a large effect size (partial η(2) = 0.75). Overall reliability of the OSCE was 0.74. Standard setting using a borderline regression method resulted in a pass rate of 100 % of E&M residents and 0 % of IM residents. All residents felt the OSCE had high value for learning as a formative exam. CONCLUSIONS: The E&M OSCE is a feasible method for assessing emergent, rare and complex medical conditions and this study provides validity evidence to support its use in a competency-based curriculum.