Impact of experience on self-assessment accuracy of clinical colonoscopy competence

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Self-assessment is important for life-long learning and a recommended assessment method for endoscopy skills. Prior literature has not investigated self-assessment accuracy of colonoscopic competence in the clinical setting. This study aimed to determine the self-assessment accuracy of novice, intermediate, and experienced endoscopists. Novice (performed<50 previous colonoscopies), intermediate (50-500), and experienced (>1000) endoscopists from 5 hospitals each performed a clinical colonoscopy. Video recordings of procedures were independently assessed by 2 blinded expert endoscopists by using the Gastrointestinal Endoscopy Competency Assessment Tool (GiECAT). Externally assessed and self-assessed GiECAT scores were defined as the mean of the 2 video-based ratings and as participants' own assigned ratings, respectively. Self-assessment accuracy between the externally assessed and self-assessed scores was evaluated by using absolute difference scores, intraclass correlation coefficients, and the Bland-Altman analysis. Twenty novice, 10 intermediate, and 10 experienced endoscopists participated. There was moderate agreement of externally assessed and self-assessed GiECAT scores, with an intraclass correlation coefficient of 0.65 (95% confidence interval, 0.44-0.80). The absolute difference scores among the 3 groups were significantly different (P= .002), with experienced endoscopists demonstrating a more accurate self-assessment ability compared with novices (P=.002). Bland-Altman plots suggest that novice and experienced endoscopists tend to overrate and underrate their clinical competence, respectively; no specific trends were associated with intermediates. Participants demonstrated moderate self-assessment accuracy of clinical competence. Endoscopist experience was positively associated with self-assessment accuracy; novices demonstrated lower self-assessment accuracy compared with experienced endoscopists. Moreover, novices tended to overestimate their performances. Novice endoscopists may benefit from targeted interventions to improve self-assessment accuracy.