Table 6. Performance of Approach A (Model 2) in defining the rate of patients unnecessarily explored or inappropriately unexplored.

Model 2
PIV	Unnecessarily explored (1−NPV) (%)	Inappropriately unexplored (1−PPV) (%)
0	17.9	28.8
1	25.0	27.6
2	33.3	19.4
3	39.0	18.2
4	48.1	16.3
5	50.0	7.4
6	53.6	5.0
7	54.3	0