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The receiver operating characteristic (ROC) curve of HbA1c for predicting oxygen therapy requirement. The optimal cut‐off value of HbA1c level for oxygen therapy requirement was 5.9% (AUC 0.850, 95% CI: 0.781–0.921, P < 0.001, sensitivity 0.682, specificity 0.885). AUC, area under the receiver operating characteristic curve; ROC, receiver operating characteristic.
