Table 2.
Risk scores for COPD exacerbations
| Predictor | Risk Score 1 | Risk Score 2 | Risk Score 3 |
|---|---|---|---|
| mMRC score 2 | 1 | 1 | 1 |
| mMRC score 3–4 | 3 | 2 | 2 |
| Chronic bronchitis | 2 | 2 | 2 |
| GERD | 1 | 1 | 1 |
| CAT score ⩾ 10 | — | 2 | 2 |
| FEV1% predicted 60–79% | — | — | 1 |
| FEV1% predicted 40–59% | — | — | 2 |
| FEV1% predicted <40% | — | — | 3 |
| Total possible points | 6 | 7 | 10 |
| Rate ratio for any exacerbation per 1-point increase (95% confidence interval) | 1.37 (1.29–1.45) | 1.34 (1.27–1.41) | 1.30 (1.25–1.36) |
| Concordance with observed exacerbation rate | 0.64 | 0.65 | 0.67 |
Definition of abbreviations: CAT = Chronic Obstructive Pulmonary Disease Assessment Test; COPD = chronic obstructive pulmonary disease; FEV1 = forced expiratory volume in 1 second; GERD = gastroesophageal reflux disease; mMRC = Modified Medical Research Council.