Table 9.
Study 1: comparison of ABAS-2 and ABAS-3 scaled scores by VCI; mean (SD)
| ABAS-2 VCI ≤ 75 (n = 153) | ABAS-3 VCI ≤ 75 (n = 169) | t value† | P value | Diff. | ABAS-2 VCI ≥ 76 (n = 883) | ABAS-3 VCI ≥ 76 (n = 1122) | t value‡ | P value | Diff. | |
|---|---|---|---|---|---|---|---|---|---|---|
| ABAS subscales | ||||||||||
| Communication | 5.04 (2.93) | 5.59 (2.36) | 1.87 | 0.062 | 0.55 | 7.33 (3.23) | 7.74 (2.58) | 3.11 | 0.002 | 0.32 |
| Community use | 4.85 (3.30) | 6.53 (2.39) | 5.27 | <0.001 | 1.68 | 6.19 (3.37) | 8.05 (2.73) | 13.70 | <0.001 | 0.62 |
| Functional academics | 4.44 (2.53) | 4.97 (2.36) | 1.93 | 0.055 | 0.53 | 7.06 (2.84) | 7.66 (2.71) | 4.76 | <0.001 | 0.22 |
| Home living | 4.59 (3.89) | 6.58 (2.41) | 5.56 | <0.001 | 1.99 | 4.97 (3.63) | 7.14 (2.44) | 15.96 | <0.001 | 0.89 |
| Health and safety | 6.17 (3.46) | 6.44 (2.49) | 0.80 | 0.42 | 0.27 | 7.90 (3.19) | 7.91 (2.76) | 0.07 | 0.944 | 0.13 |
| Leisure | 6.29 (2.99) | 6.15 (2.59) | ‒0.47 | 0.64 | ‒0.15 | 7.92 (3.22) | 7.59 (2.83) | ‒2.43 | 0.015 | 0.02 |
| Self-care | 5.27 (3.55) | 7.01 (2.95) | 4.78 | <0.001 | 1.73 | 6.58 (3.26) | 8.09 (2.72) | 11.25 | <0.001 | 0.71 |
| Self-direction | 3.65 (3.20) | 5.55 (2.01) | 6.43 | <0.001 | 1.90 | 5.15 (3.43) | 6.54 (2.28) | 10.80 | <0.001 | 0.54 |
| Social | 4.98 (3.60) | 6.21 (2.70) | 3.48 | 0.001 | 1.23 | 6.62 (3.93) | 7.43 (2.79) | 5.39 | <0.001 | 0.32 |
ABAS, Adaptive Behavior Assessment System; VCI, Verbal Comprehension Index; SD, standard deviation; Diff., difference score (ABAS-3 — ABAS-2).
†
Degrees of freedom = 320.
‡
Degrees of freedom = 2003.