Figure 6From: Domiciliary pulse-oximetry at exacerbation of chronic obstructive pulmonary disease: prospective pilot study ROC Curves. ROC curves for the ability of the individual components, and Oximetry and Oximetry-PEF scores to differentiate exacerbation onset from day-to-day symptom variation (symptom days) in COPD. The data are reported in Table 4.Back to article page