Table 4.

Ability of the individual components and composite scores to differentiate exacerbation onset days from symptom days (day-to-day symptom variation).

	AUC	95%CI	p =
Heart Rate	0.731	0.613-0.849	0.042
Oxygen Saturation	0.740	0.590-0.889	0.034
Peak-Expiratory Flow (PEF)	0.615	0.410-0.819	0.311
Oximetry Score	0.832	0.735-0.929	0.003
Oximetry-PEF Score	0.732	0.589-0.876	0.040

p value represents difference from chance (AUC = 0.5).