TABLE 1. MEAN PERFORMANCE AND (STANDARD DEVIATION) FOR THE TOTAL COHORT (N=50) AND FOR GIRLS AND BOYS SEPARATELY.
| VARIABLES | TOTAL SAMPLE | GIRLS | BOYS |
|---|---|---|---|
| AGE (MONTHS) | 90.9 (12.3) | 91.2 (11.6) | 90.7 (12.9) |
| GO/NO-GO REACTION TIME | 526.3 (75.2) | 529.2 (79.8) | 524.2 (73.1) |
| SINGLE ALTERNATION | 11.98 (2.8) | 12.2 (3.3) | 11.8 (2.5) |
| DOUBLE ALTERNATION | 26.2 (14.1) | 23.8 (12.4) | 28.1 (15.2) |
| TAPPING DOMINANT HAND | 34.1 (6.4) | 32.7 (5.4) | 35.2 (7.0) |
| TAPPING NON-DOMINANT HAND | 30.2 (5.2) | 28.8 (3.9) | 31.2 (5.8) |
| CONTINUOUS MEMORY OLD ABSTRACT | 64.9 (39.5) | 58.5 (53.7) | 70.1 (22.3) |
| CONTINUOUS MEMORY OLD CONCRETE | 69.0 (39.9) | 64.1 (55.9) | 72.9 (19.8) |
| WISC PERCEPTUAL REASONING INDEX | 107.8 (16.1) | 108.1 (9.8) | 107.7 (19.6) |
| WISC PERCEPTUAL REASONING PERCENTILE | 63.8 (29.6) | 67.6 (21.3) | 61.0 (34.5) |
| WISC BLOCK DESIGN | 10.5 (2.8) | 10.7 (2.2) | 10.3 (3.2) |
| WISC PICTURE COMPLETION | 11.8 (3.1) | 12.2 (2.8) | 11.5 (3.4) |
| WISC MATRIX REASONING | 11.5 (3.5) | 11.0 (2.8) | 11.9 (3.9) |