Table 1.
Retained MedDrive outcomes from derivation set.
| Transformation Score [0–1] | Range of expected values | |||
|---|---|---|---|---|
| Retained | Observed (10th–90th percentile) | |||
| Age < 40 (n = 27) | Age > 65 (n = 74) | |||
| VISUAL RECOGNITION TASK (TASK 1) | ||||
| Central visual processing | 1 − [(ln(t) − 2.833)/3.564] | 17–600 ms | 59–175 ms | 137–520 ms |
| Peripheral visual processing | 1 − [(ln(t) − 2.833)/3.852] | 17–800 ms | 17–139 ms | 92–715 ms |
| Dual tasking | 1 − [(ln(t) − 2.833)/5.328) | 17–3500 ms | 186–1258 ms | 1215–3255 ms |
| CENTRAL CUE ATTENTION TASK (TASK 2) | ||||
| Execution with orientation cue | 1 − [(t − 150)/350] | 150–500 ms | 249–348 ms | 282–441 ms |
| MOVEMENT DETECTION TASK (TASK 3) | ||||
| Movement detection with attention shift | 1 − [(t − 300)/1500) | 300–1800 ms | 448–1064 ms | 743–1648 ms |
| WORKING SPATIAL MEMORY TASK (TASK 4) | ||||
| Working memory—1st cue | 1 − [(d − 1)/29] | 1–30 mm | 7.8–19.5 mm | 11.8–25.0 mm |
| Working memory—last cue | 1 − [(d − 1)/29) | 1–30 mm | 7.0–12.8 mm | 7.4–20.6 mm |
The measured threshold values were transformed to range from zero to one. The range of expected values was estimated from healthy populations. Outcomes below the lower bound of retained expected values were attributed the score 1 (optimal response), and values above the upper bound of retained values the score of 0. High scores therefore indicate better performance.