Table 1.
Summary statistics of fluid intelligence scores.
| Task | DSST | TMTspeed | TMTexec | Digit span backwards | MWT-B |
|---|---|---|---|---|---|
| Mean (SD) | 68.6 (15.9) | 34.2 (12.1) | 2.2 (0.76) | 7.6 (2.6) | 32 (3.2) |
| Range (Min − Max) | 35–98 | 20–70 | 1.1–4.7 | 4–14 | 24–37 |
| Correlations | |||||
| TMT speed | −0.575** | ||||
| TMT exec | −0.099 | −0.282 | |||
| Digit Span Backwards | 0.306 | −0.121 | −0.090 | ||
| MWT-B | 0.576** | −0.490** | −0.205 | 0.379+ |
**
p < 0.01;
+
p < 0.1;
DSST, Digit Symbol Substitution Task score; TMTspeed, Trail Making Test A in s; TMTexec, Trail Making Test B in s/TMTspeed); Digit Span, Digit Span Backwards maximum span retained; MWT-B, German vocabulary test.