Table 2.
Algorithm applied to walking segments of 10 or more strides.
| Patient | H&Ya | # Segments OFF | # Segments ON | Minutes OFF | Minutes ON | Specificity % (SD) | Sensitivity % (SD) | PPV %b(SD) | NPV %c(SD) |
| 1 | 3 | 74 | 14 | 22 | 122 | 95 (5) | 100 (0) | 99 (1) | 100 (0) |
| 2 | 4 | 10 | 84 | 107 | 161 | 94 (3) | 100 (0) | 68 (15) | 100 (0) |
| 3 | 3 | 5 | 5 | 7 | 213 | - | - | - | - |
| 4 | 3 | 8 | 21 | 26 | 125 | 88 (9) | 96 (7) | 78 (15) | 99 (3) |
| 5 | 2.5 | 9 | 91 | 18 | 276 | 100 (0) | 100 (0) | 100 (0) | 100 (0) |
| 6 | 3 | 9 | 88 | 7 | 159 | 100 (0) | 100 (0) | 100 (0) | 100 (0) |
| 7 | 2.5 | 25 | 41 | 5 | 159 | 96 (0) | 100 (0) | 94 (4) | 100 (0) |
| 8 | 2 | 12 | 114 | 3 | 138 | 97 (4) | 100 (0) | 81 (21) | 100 (0) |
| 9 | 2 | 0 | 160 | 3 | 327 | - | - | - | - |
| 10 | 4 | 28 | 30 | 11 | 13 | 83 (26) | 82 (11) | 87 (17) | 86 (8) |
| 11 | 1.5 | 0 | 5 | 0 | 191 | - | - | - | - |
| 12 | 2.5 | 5 | 85 | 22 | 260 | - | - | - | - |
| 13 | 3 | 29 | 10 | 41 | 179 | 100 (0) | 100 (0) | 100 (0) | 100 (0) |
| 14 | 2.5 | 0 | 45 | 2 | 73 | - | - | - | - |
| 15 | 3 | 53 | 70 | 37 | 107 | 90 (8) | 83 (24) | 89 (7) | 91 (13) |
aH&Y=Hoehn and Yahr scale
bPPV = positive predictive value
cNPV = negative predictive value