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| (b) Cox proportional hazards multivariate analysis | |||
|---|---|---|---|
| Predictive factor | Odds ratio | 95% Confidence interval | p-value |
| PA:A ratio | 1.48E-04 | 2.523E-8–0.864 | 0.0462* |
| A-aDO2 | 1.072 | 0.968–1.187 | 0.1799 |
| Brinkman index | 1.001 | 1.000–1.001 | 0.1906 |
*statistically significant; PA:A: the pulmonary artery diameter to the ascending aorta diameter; A–aDO2: alveolar–arterial oxygen gradient
