Table 4 -.

Performance of the decision tool

Test characteristics	Value (95% CI)
	Derivation cohort	Validation cohort
Sensitivity, %	79.2 (59.5 – 90.8)	63.6 (35.4 – 84.8)
Specificity, %	77.8 (66.9 – 85.8)	71.7 (58.4 – 82.0)
PPV, %	54.3 (38.2 – 69.5)	31.8 (16.4 – 52.7)
NPV, %	91.8 (82.2 – 96.5)	90.5 (77.9 – 96.2)
Accuracy, %	78	71
Likelihood ratio	3.6	2.3

Wilson-Brown method was used to calculate the confidence interval of test characteristics.

PPV- Positive Predictive Value, NPV- Negative Predictive Value