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Calibration curves for internal and external validation of acute kidney injury (AKI) models, with predicted probability based on the AKI model on the X-axis, and actual observed probability on the Y-axis. a) Internal calibration curve for intensive care unit (ICU) patients, generated via bootstrapping. b) External calibration curve for ICU patients. c) Internal calibration curve for non-ICU patients, generated via bootstrapping. d) External calibration curve for non-ICU patients.
