Table 6.
Descriptive statistics for the neuropsychological and vision tests administered in the SKILL study.
| Measure | M | SD | Min | Max | Missing (%) |
|---|---|---|---|---|---|
| Letter comparison (ncorrect) | 40.10 | 9.02 | 13.00 | 69.00 | 0.36 |
| Pattern comparison (ncorrect) | 27.46 | 6.13 | 4.00 | 45.00 | 0.12 |
| Shape Color Size RT (ms) | 1392.41 | 243.03 | 692.25 | 2175.61 | 2.17 |
| Digit Symbol Substitution (ncorrect/s) | 1.29 | 0.61 | −0.55 | 8.05 | 0.00 |
| Trail Making Test-A (s) | 42.56 | 17.62 | 14.61 | 205.53 | 0.12 |
| Trail Making Test-B (s) | 129.15 | 91.29 | 36.60 | 480.00 | 0.12 |
| Stroop task (score) | 31.28 | 16.25 | 3.12 | 147.56 | 3.99 |
| WMS-III Digit Span (ncorrect) | 9.66 | 2.12 | 4.00 | 16.00 | 0.00 |
| WMS-III Spatial Span (ncorrect) | 7.51 | 1.73 | 0.00 | 13.00 | 0.00 |
| WASI Matrix reasoning (z score) | 0.34 | 1.15 | −2.20 | 2.80 | 0.60 |
| WASI Vocabulary (z score) | 0.66 | 0.82 | −3.00 | 2.60 | 0.36 |
| Far visual acuity (score) | 72.01 | 11.24 | 11.50 | 90.00 | 0.00 |
| Near visual acuity (score) | 81.93 | 6.26 | 61.00 | 90.00 | 0.00 |
| Contrast sensitivity (log10) | 1.69 | 0.15 | 0.90 | 1.95 | 0.00 |
Note. We analyzed response times (RT) in the Shape Color Size task. Digit and Spatial Span were taken from the Wechsler Memory Scale-III (WMS-III, Wechsler, 1987); Matrix reasoning and Vocabulary tasks were taken from the Wechsler Abbreviated Scale of Intelligence (WASI; Wechsler, 1999).