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These five factors were used to create the operation time prediction equation and difficulty scoring system. The multiple r2 value was 0.40 for the operation time prediction equation. Receiver operating characteristic curve analysis of the difficulty scoring system revealed the following sensitivity 78.0%, specificity 64.9%, and c-statistic 0.76 (95% confidence interval 0.70-0.83). The equation to predict operation time and the surgical difficulty prediction model created in this study are easy to calculate and are accurate. Both may he