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Calibration curves of the predicted nomogram in the training set (a) and validation set (b). The x-axis represents the predicted probability calculated by the nomogram, and the y-axis is the observed actual probability of AKI. The clinodiagonal represents a perfect prediction by an ideal model. The solid curve represents the initial cohort and the dotted curve is bias corrected by bootstrapping (B = 1000 repetitions), which demonstrates the performance of the predicted model.
