Table 4.
Significance testing of change in cognitive skills.
| WJ III test | Pre W score Mean (SD) | Post W score Mean (SD) | Difference | p | Effect size Cohen’s d | Pre Percentile Mean (SD) | Post Percentile Mean (SD) |
|---|---|---|---|---|---|---|---|
| General Intellectual Ability (GIA) | 513.7 (9.4) | 527.6 (8.5) | 13.9∗ | 0.000 | 2.5 | 32 (17) | 63 (19) |
| Long-term memory (COG 2) | 498.7 (7.9) | 510.0 (10.1) | 11.3∗ | 0.002 | 1.3 | 35 (20) | 64 (19) |
| Visual processing (COG 3) | 506.4 (10.9) | 513.5 (9.8) | 7.1 | 0.067 | 0.66 | 45 (26) | 60 (23) |
| Auditory processing (ACH 21) | 505.8 (13.2) | 519.6 (13.1) | 13.8∗ | 0.007 | 1.1 | 30 (26) | 59 (29) |
| Fluid reasoning (COG 5) | 518.3 (14.5) | 532.7 (13.4) | 14.4∗ | 0.000 | 2.2 | 55 (26) | 76 (17) |
| Processing speed (COG 6) | 506.5 (13.9) | 518.3 (8.8) | 11.8∗ | 0.003 | 1.3 | 19 (18) | 37 (19) |
| Working memory (COG 7) | 518.3 (24.2) | 542.2 (20.4) | 23.9 | 0.012 | 0.99 | 39 (30) | 68 (25) |
∗significant at Bonferroni-corrected alpha p < 0.007.