|  | Cutoff = 6 | Cutoff = 7 | Cutoff = 8 | Cutoff = 9 | ||||||||
Observed Falls | Observed Falls | Observed Falls | Observed Falls | ||||||||||
 |  | + | – | tot | + | – | tot | + | – | tot | + | – | tot |
Predicted Falls | + | 10 | 59 | 69 | 9 | 46 | 55 | 8 | 38 | 46 | 5 | 28 | 33 |
– | 1 | 77 | 78 | 2 | 90 | 92 | 3 | 98 | 101 | 6 | 108 | 114 | |
tot | 11 | 136 | 147 | 11 | 136 | 147 | 11 | 136 | 147 | 11 | 136 | 147 | |
 |  |  | C.I. 95% |  | C.I. 95% |  | C.I. 95% |  | C.I. 95% | ||||
Se (%) | 91 | 74 | 100 | 82 | 59 | 100 | 73 | 46 | 99 | 45 | 16 | 75 | |
Sp (%) | 57 | 48 | 65 | 66 | 58 | 74 | 72 | 65 | 80 | 79 | 73 | 86 | |
PPV (%) | 14 | 6 | 23 | 16 | 7 | 26 | 17 | 6 | 28 | 15 | 3 | 27 | |
NPV (%) | 99 | 96 | 100 | 98 | 95 | 100 | 97 | 94 | 100 | 95 | 91 | 99 |