Table 4.

Comparison of prediction of outcome by three methods in 385 patients with paraquat concentrations more than 4-h post ingestion

Method	Specificity (95% CI)	Sensitivity (95% CI)	Positive likelihood ratio	Negative likelihood ratio	Positive predictive value (95% CI)	Negative predictive value (95% CI)
Proudfoot/ Scherrmann	0.83 (0.76–0.86)	0.81 (0.76–0.86)	4.82	0.22	0.87 (0.82–0.91)	0.76 (0.69–0.82)
Sawada et al.	0.93 (0.87–0.96)	0.58 (0.51–0.64)	7.70	0.46	0.92 (0.86–0.96)	0.61 (0.54–0.67)
Jones et al.	0.92 (0.87–0.96)	0.66 (0.60–0.72)	8.15	0.37	0.92 (0.87–0.96)	0.66 (0.59–0.72)