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Evaluation of optimal ventilation rates using receiver operating characteristic area under the curve (AUC; A and B) and cubic spline analysis (C and D). Children less than 1 yr old (A and C), and older children greater than or equal to 1 yr old (B and D). Solid line in AUC analysis signifies the predicted survival rate, whereas the dotted line represents the 95% CI. bpm = breaths/min, Cut = optimal cut point, Sens = sensitivity, Spec = specificity.
