Inter-Observer Agreement in the Endoscopic Classification of Colorectal Laterally Spreading Tumors: A Multicenter Study Between Experts and Trainees

Title
Inter-Observer Agreement in the Endoscopic Classification of Colorectal Laterally Spreading Tumors: A Multicenter Study Between Experts and Trainees
Author(s)
장병익이유진[이유진]김은수[김은수]박경식[박경식]조광범[조광범]이미영[이미영]김성국[김성국]전성우[전성우]이시형김경옥
Keywords
MUCOSAL RESECTION; LOW KAPPA; CANCER; PREVALENCE; PARADOXES; POLYPS; COLON
Issue Date
201410
Publisher
SPRINGER
Citation
DIGESTIVE DISEASES AND SCIENCES, v.59, no.10, pp.2550 - 2556
Abstract
The risk of cancer varies with the subtype of colorectal "laterally spreading tumors" (LSTs). However, visual interpretations vary among endoscopists. The aim of this study was to evaluate inter-observer agreement and accuracy in the endoscopic classification of LST subtypes among experts and trainees. In total, 40 LST images were collected and reviewed independently by 14 gastroenterology experts and 10 trainees. All investigators recorded their findings as one of the following four categories: homogeneous, nodular mixed, flat-elevated, and pseudo-depressed. Agreement was assessed in terms of the kappa (kappa) statistic and AC1 estimate. Accuracy is reported as percentage agreement with the gold standard, based on the gross morphology of the resected specimens. Of the possible 91 pair-wise kappa estimates among experts, 41 (45.1 %) were > 0.75, indicating excellent agreement, while only 2 (4.44 %) of the 45 pair-wise kappa estimates among trainees were > 0.75. Agreements for individual LST subtypes in the trainee group were significantly lower than those in the expert group. The kappa and AC1 estimates showed similar values in individual subtypes of LSTs. The overall accuracy of LST was also significantly higher for the experts than the trainees (85.9 vs. 72.5 %, P < 0.001). Notably, the flat-elevated subtype showed the lowest agreement and accuracy and was frequently misclassified as the pseudo-depressed subtype by both groups. Inter-observer agreement and accuracy for LST subtype classification differ significantly between experts and trainees. Implementation of an adequate training system for beginners is necessary to better identify colorectal LSTs.
URI
http://hdl.handle.net/YU.REPOSITORY/30699http://dx.doi.org/10.1007/s10620-014-3206-3
ISSN
0163-2116
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의과대학 > 내과학교실 > Articles
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