Independent predictors of a serious adverse event, as determined by stepwise logistic regression analysis (for 844 patients with chronic obstructive pulmonary disease)*
| Variable | β coefficient | Odds ratio (95% CI) |
|---|---|---|
| Intercept | −3.82 | |
| History of peripheral vascular disease | 0.90 | 2.46 (0.92–6.61) |
| Prior coronary bypass graft | 0.71 | 2.03 (0.84–4.92) |
| Prior intubation for respiratory distress | 1.32 | 3.73 (1.38–10.12) |
| ECG with acute ischemic changes | 1.18 | 3.25 (0.95–11.04) |
| Chest radiography shows pulmonary congestion | 0.63 | 1.88 (0.94–3.78) |
| Too ill to do walk test after treatment in emergency department | 1.25 | 3.50 (1.93–6.35) |
| Heart rate on arrival in emergency department ≥ 110/min | 1.12 | 3.05 (1.68–5.55) |
| Hemoglobin < 100 g/L | 1.59 | 4.90 (2.05–11.68) |
| Urea ≥ 12 mmol/L | 0.89 | 2.43 (1.20–4.93) |
| Serum CO2 ≥ 35 mmol/L | 0.66 | 1.91 (0.77–4.72) |
Note: CI = confidence interval, ECG = electrocardiogram.
↵* Hosmer–Lemeshow goodness-of-fit p = 0.7; area under receiver operating characteristic curve = 0.796 (95%CI 0.739–0.852).