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Sensitivity and specificity of the Oximetry Score in differentiating exacerbation onset from symptom days (day-to-day symptom variation) in COPD.
| Oximetry Score* | Sensitivity | Specificity |
|---|---|---|
| +0.5 | 100% | 54% |
| +1.0 | 71% | 74% |
| +1.5 | 29% | 89% |
| +2.0 | 14% | 94% |
*A +1SD change in score could represent, for example, a fall in oxygen saturation of 1% and a rise in heart rate of 5 min-1, or no change in oxygen saturation from baseline and a rise in heart rate of 10 min-1. See text for further details.
