Fig. 4From: The impact of impaired sleep quality on symptom change and future exacerbation of chronic obstructive pulmonary disease ROC curve of sleep quality for predicting future exacerbation AUC of PSQI score for predicting future exacerbation is 0.69(95% CI: 0.64–0.73, P<0.001), the sensitivity and the specificity is 62.3% and 71.3%Abbreviations: AUC, Area under of ROC curve; PSQI, Pittsburgh sleep quality index; ROC, Receiver operating characteristic.Back to article page