Table 5. Diagnostic accuracy of the revised symptom-based questionnaire.

Diagnostic test*	Value (%)	95% CI (%)
Sensitivity	82.45	78.79–85.71
Specificity	72.87	71.36–74.34
Positive predictive value (PPV)	29.97	27.53–32.49
Negative predictive value (NPV)	96.72	95.96–97.37
Kappa	0.32