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. 2018 Dec 1;30(4):303–310. doi: 10.5792/ksrr.17.064

Fig. 2.

Fig. 2

Cumulative summation test for learning curve (LC-CUSUM) and standard cumulative summation (CUSUM) test for undercorrection and overcorrection. (A) The LC-CUSUM reached the lower decision limit after 27 procedures in preventing undercorrection, suggesting surgical competency could be achieved. (B) The LC-CUSUM did not reach the lower decision limit after 100 procedures in prevention of overcorrection, suggesting surgical competency could not be achieved.