Table 2.
Validation values for steps detection in the home-like assessment.
| Cohorts | Cohen’s kappa (%) | Acc (%) | Sens (%) | Spec (%) | NPV (%) | PPV (%) | Steps detected by algorithm | Steps detected by clinical observers | True positive steps | False positive steps | False negative steps | True negative steps |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Turning episodes | ||||||||||||
| Overall cohort | 73 | 88 | 90 | 85 | 78 | 94 | 5,020 | 4,831 | 4,517 | 314 | 503 | 1,730 |
| PD patients | 70 | 88 | 90 | 83 | 75 | 94 | 3,618 | 3,484 | 3,257 | 227 | 361 | 1,083 |
| Controls | 77 | 89 | 90 | 88 | 82 | 94 | 1,402 | 1,347 | 1,260 | 87 | 142 | 647 |
| Non-turning episodes | ||||||||||||
| Overall cohort | 72 | 91 | 91 | 90 | 69 | 98 | 21,313 | 19,885 | 19,429 | 456 | 1,884 | 4,096 |
| PD patients | 71 | 91 | 91 | 90 | 67 | 98 | 15,522 | 14,493 | 14,181 | 312 | 1,341 | 2,738 |
| Controls | 74 | 91 | 91 | 90 | 71 | 97 | 5,791 | 5,392 | 5,248 | 144 | 543 | 1,358 |
Acc, accuracy; NPV, negative predictive value; PD, Parkinson’s disease; PPV, positive predictive value; Sens, sensitivity; Spec, specificity.