Table 3.
Group Comparisons for the Handwriting Kinematic Variables
| Handwriting Kinematic Variables | Healthy Comparison Subjects (N=46) | Medicated Psychosis Patients (N=59) | Student’s t* |
|---|---|---|---|
| DUR | 174 (49) | 228 (68) | −4.51 (p≤0.0001) |
| DURsub | 157 (34) | 198 (53) | −4.56 (p≤0.0001) |
| PVV | 7.55 (1.91) | 6.40 (2.27) | 2.76 (p≤0.01) |
| PVVsub | 0.24 (0.19) | 0.30 (0.19) | −1.61 (p=ns) |
| ANJ | 19.73 (9.97) | 36.30 (27.03) | −3.95 (p≤0.005) |
| APK | 1.65 (0.68) | 2.16 (0.48) | −3.42 (p≤0.001) |
| APKsub | 1.45 (0.48) | 1.82 (0.60) | −3.38 (p≤0.001) |
Key: DUR = Duration of pen movement in ms; PVV = peak vertical velocity of pen movement strokes in cm/sec; ANJ= Average normalized jerk, a measure of movement smoothness; APK= the number of acceleration peaks/stroke; sub = primary submovement.
*
for all statistical comparisons, degrees of freedom = 103.