Table 10.
Study 2: comparison of ABAS-2 and ABAS-3 standard scores by VCI; mean (SD)
| ABAS-2 VCI ≤ 75 (n = 58) | ABAS-3 VCI ≤ 75 (n = 58) | t value† | P value | Diff. | CCC, 95% CI [lower, upper] | ABAS-2 VCI ≥ 76 (n = 300) | ABAS-3 VCI ≥ 76 (n = 300) | t value‡ | P value | Diff. | CCC, 95% CI [lower, upper] | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Composites | ||||||||||||
| GAC | 65.12 (15.46) | 73.95 (12.71) | 5.02 | <0.001 | 8.83 | 0.46 [0.29, 0.63] | 76.12 (14.73) | 82.69 (11.42) | 9.24 | <0.001 | 6.57 | 0.50 [0.43, 0.56] |
| Conceptual | 67.00 (13.52) | 72.21 (11.49) | 3.17 | 0.002 | 5.21 | 0.46 [0.28, 0.65] | 79.88 (13.64) | 82.99 (10.86) | 4.74 | <0.001 | 3.11 | 0.56 [0.49, 0.63] |
| Social | 77.26 (17.84) | 78.55 (13.51) | 0.72 | 0.474 | 1.29 | 0.63 [0.48, 0.78] | 84.53 (15.74) | 86.64 (13.77) | 2.72 | 0.007 | 2.11 | 0.58 [0.51, 0.66] |
| Practical | 66.02 (19.03) | 77.33 (13.95) | 5.65 | <0.001 | 11.31 | 0.47 [0.31, 0.63] | 75.31 (16.26) | 83.66 (11.99) | 10.02 | <0.001 | 8.35 | 0.42 [0.34, 0.50] |
ABAS, Adaptive Behavior Assessment System; CCC, concordance correlation coefficient; SD, standard deviation; VCI, Verbal Comprehension Index.
†
Degrees of freedom = 57.
‡
Degrees of freedom = 299.