Table II.
Prediction of the mortality rate in acute PQ poisoning.
| Parameter | Cut-off point | Sensitivity (%) | Specificity (%) | AUC (95% CI) | Youden’s index |
|---|---|---|---|---|---|
| Arterial lactate (mmol/l) | 4.20 | 82.80 (73.57, 89.83) | 63.64 (51.89, 74.30) | 0.774 (0.703, 0.834) | 0.464 |
| Arterial lactate-time (mmol/l.h) | 11.95 | 64.52 (53.91, 74.17) | 84.42 (74.36, 91.68) | 0.782 (0.712, 0.841) | 0.490 |
| PQ concentration (mg/l) | 9.35 | 86.02 (77.28, 92.34) | 59.74 (47.94, 70.77) | 0.765 (0.694, 0.826) | 0.462 |
| PQ concentration-time (mg/l.h) | 22.70 | 44.01 (32.79, 53.69) | 92.21 (83.81, 97.09) | 0.768 (0.697, 0.829) | 0.362 |
| Time lag after PQ ingestion (h) | 6.50 | 66.67 (56.31, 75.96) | 48.05 (36.52, 59.74) | 0.568 (0.490, 0.644) | 0.145 |
Results are expressed as median (range) values. PQ, paraquat; AUC, area under the curve; CI, confidence interval.