Table 3.
Validation values for detection of 90° turns, separated by groups.
Cohorts | Cohen’s kappa | Acc | Sens | Spec | NPV | PPV | Turns detected by algorithm | Turns detected by clinical observers | True positive turns | False positive turns | True negative turns | False negative turns |
---|---|---|---|---|---|---|---|---|---|---|---|---|
All | 0.82 | 0.91 | 0.93 | 0.89 | 0.90 | 0.92 | 2,393 | 2,304 | 2,150 | 243 | 1,884 | 154 |
PD ON-med. | 0.68 | 0.83 | 0.92 | 0.78 | 0.74 | 0.93 | 681 | 652 | 602 | 79 | 609 | 50 |
PD OFF-med. | 0.84 | 0.92 | 0.94 | 0.89 | 0.92 | 0.93 | 934 | 905 | 843 | 91 | 688 | 62 |
Controls | 0.84 | 0.92 | 0.94 | 0.89 | 0.91 | 0.93 | 778 | 747 | 705 | 73 | 587 | 42 |
Acc, accuracy; NPV, negative predictive value; PD, Parkinson’s disease; OFF, medication off state; ON, medication on state; PPV, positive predictive value; Sens, sensitivity; Spec, specificity.
Validation values on a sample by sample basis are comparable (not shown).