Annals of Hepato-Biliary-Pancreatic Surgery

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Fig. 2.

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Fig. 2. CUSUM and moving average graph by operation time for evaluating the learning curve. (A) CUSUM with operation time for 73 consecutive patients with hemi-hepatectomy or trisectionectomy without vascular resection. A CUSUM=0 meant the operation time was the same as the mean operation time. A positive CUSUM meant the operation time was shorter than the mean operation time. The operation times were steadily shorter than the mean operation time after the 27th case. (B) Moving average graph for each of five serial cases. A logistic regression graph was drawn to identify the learning achievement point. The steep slope of the logistic regression graph before the 27th case started to flatten after the 27th case. Thus, the learning curve may be stabilized after the 27th of 73 consecutive patients.
Ann Hepatobiliary Pancreat Surg 2021;25:54-61 https://doi.org/10.14701/ahbps.2021.25.1.54
© 2021 Ann Hepatobiliary Pancreat Surg