Indexes of efficacy of the prediction rule in relation to various Zs scores selected as cutoff values
. | Derivation group, n = 826* . | . | . | . | Validation group, n = 654* . | . | . | . | Total, n = 1480* . | . | . | . | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Zs cutoff value . | Sens, % . | Spec, % . | PPV, % . | NPV, % . | Sens, % . | Spec, % . | PPV, % . | NPV, % . | Sens, % . | Spec, % . | PPV, % . | NPV, % . | |||||||||
| -2 | 100.0 | 47.7 | 10.1 | 100.0 | 98.1 | 36.8 | 12.0 | 99.5 | 99.0 | 42.9 | 11.1 | 99.8 | |||||||||
| 0 | 97.8 | 51.5 | 10.6 | 99.8 | 98.1 | 40.3 | 12.7 | 99.6 | 98.0 | 46.6 | 11.6 | 99.7 | |||||||||
| 1 | 97.8 | 59.9 | 12.6 | 99.8 | 94.3 | 52.7 | 15.0 | 99.1 | 96.0 | 56.8 | 13.7 | 99.5 | |||||||||
| 2 | 93.5 | 62.6 | 12.8 | 99.4 | 88.7 | 56.9 | 15.4 | 98.3 | 90.9 | 60.1 | 14.0 | 99.2 | |||||||||
. | Derivation group, n = 826* . | . | . | . | Validation group, n = 654* . | . | . | . | Total, n = 1480* . | . | . | . | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Zs cutoff value . | Sens, % . | Spec, % . | PPV, % . | NPV, % . | Sens, % . | Spec, % . | PPV, % . | NPV, % . | Sens, % . | Spec, % . | PPV, % . | NPV, % . | |||||||||
| -2 | 100.0 | 47.7 | 10.1 | 100.0 | 98.1 | 36.8 | 12.0 | 99.5 | 99.0 | 42.9 | 11.1 | 99.8 | |||||||||
| 0 | 97.8 | 51.5 | 10.6 | 99.8 | 98.1 | 40.3 | 12.7 | 99.6 | 98.0 | 46.6 | 11.6 | 99.7 | |||||||||
| 1 | 97.8 | 59.9 | 12.6 | 99.8 | 94.3 | 52.7 | 15.0 | 99.1 | 96.0 | 56.8 | 13.7 | 99.5 | |||||||||
| 2 | 93.5 | 62.6 | 12.8 | 99.4 | 88.7 | 56.9 | 15.4 | 98.3 | 90.9 | 60.1 | 14.0 | 99.2 | |||||||||
Sens indicates sensitivity; spec, specificity; PPV, positive predictive value; NPV, negative predictive value.
Only patients with complete data for all predictive variables were included.