Fig. 6From: Development and validation of a nomogram for postoperative sleep disturbance in adults: a prospective survey of 640 patients undergoing spinal surgeryCalibration plots of the nomogram. A: the training set; B: the validation set. The dashed line represents the performance of an ideal nomogram. The dotted line represents the entire cohort. The solid line is bias-corrected by bootstrapping(B = 1000 repetitions)Back to article page