Table 4 Ability of the individual components and composite scores to differentiate exacerbation onset days from symptom days (day-to-day symptom variation).

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