Operative difficulty for laparoscopic cholecystectomy is hard to predict.
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Deviations from the standard operative time were used to compare procedures.
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The score for difficult laparoscopic cholecystectomy (DiLC score) was generated.
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Area under the ROC curve was .80, and a diagnostic accuracy was 75.5%.
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The simplicity of the DiLC score makes it easy to integrate into clinical practice.
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