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Calibration curves for the admission Acute Physiology and Chronic Health Evaluation (APACHE) II score and the worst 24-hour APACHE II score in predicting hospital mortality across different risk strata. The Hosmer-Lemeshow goodness of fit chi-square H statistic for the admission APACHE II predicted mortality and for the worst 24-hour APACHE II predicted mortality were 66.9 and 189.3, respectively (both P < 0.0001).
