Figure 1.

(a) Receiver operating characteristic curve for predicting intra‐abdominal infection based on the serum albumin level and operative duration. The area under the receiver operating characteristic curve is 0.7846. (b) This figure shows a contour plot the estimated probability of intra‐abdominal infection following major hepatectomy stratified according to the serum albumin concentration and operative duration, based on the logistic regression model. As an example, the darkest blue shaded are in the upper left had corner of the figure represents probabilities of intra‐abdominal infection between 0.6–0.8, in which the operative duration ranges between 450–900 min, and the preoperative albumin level ranges between 22–32 g/l