Table 4. Cox Proportional Hazards Models for Mortality Prediction of PQ Poisoning.
| Univariate Cox Model | Multivariate Cox Model | |||
|---|---|---|---|---|
| variable | HR (95%CI) | P value | HR (95%CI) | P value |
| Amount | 6.91 (6.11–7.81) | < 0.001 | 2.49 (2.15–2.88) | < 0.001 |
| Plasma | 10.21 (9.17–11.49) | < 0.001 | 4.52 (3.92–5.21) | < 0.001 |
| Urine | 7.81 (6.86–8.89) | < 0.001 | 2.04 (1.74–2.40) | < 0.001 |
| APACHEII | 8.08 (6.99–9.33) | < 0.001 | 3.80 (3.24–4.46) | < 0.001 |
| SOFA | 5.23 (4.54–6.02) | < 0.001 | N/A | 0.225 |
| Ground glass opacity | 14.34 (12.23–16.80) | < 0.001 | 5.82 (4.77–7.09) | < 0.001 |
| Consolidation | 2.74 (2.45–3.08) | < 0.001 | N/A | 0.229 |
| Pneumomediastinum * | 6.09 (5.31–6.99) | < 0.001 | 1.72 (1.49–1.98) | < 0.001 |
| “No obvious lesion” * | 0.35 (0.30–0.42) | < 0.001 | N/A | 0.240 |
Definition of abbreviations: PQ = paraquat; HR = harzard ratio; N/A = not applicable.
Note: * indicates variables were categorical using the presence of CT finding as a dichotomous variable; other variables were categorical according whether lesion volume ratio was above or below the optimal cutoff point.