Table 3.
SVM classification accuracy for poor (n = 4) versus good motor outcome (n = 4) in a subsample of stroke patients with moderate initial motor impairment (n = 8)
| Feature | Mean balanced accuracy (%) | Sensitivity (%) | Specificity (%) | Chi‐square, P‐value |
|---|---|---|---|---|
| Single features | ||||
| Assessment of motor performance (acute) | 63% | — | — | Chi2(1) = 0.5, P = 0.480 n. s. |
| fMRI (acute) | 87.5% | 100% | 75% | Chi2(1) = 4.5, P = 0.034 |
| Clinical data (age, time since stroke, lesion volume, % CST damage) | ≤ 50% | — | — | Chi2(1) = 0.143, P = 0.705 n.s. |
| Feature combinations | ||||
| fMRI + motor performance (acute) | 87.5% | 100% | 75% | Chi2(1) = 4.5, P = 0.034 |
| fMRI (acute) + clinical data | 87.5% | 100% | 75% | Chi2(1) = 4.5, P = 0.034 |
| Motor performance (acute) + clinical data | 50% | — | — | Chi2(1) = 0.143, P = 0.705 n.s. |
| fMRI + motor performance (acute) + clinical data | 87.5% | 100% | 75% | Chi2(1) = 4.5, P = 0.034 |
Assessment of motor performance refers to the ARAT score of the affected hand and the grip force index of the affected relative to the unaffected hand (in %). ARAT: Action Research Arm Test (score for the affected hand, maximum = 57); CST: corticospinal tract; n.s.: not significant.