Table 3.
Adjustment coefficients representing the scaled score drift between the original and revised WAIS and WAIS-R
| Adjustment coefficients | Paired sample t-tests | ||
|---|---|---|---|
| (WAIS–WAIS-R) | t | p | |
| Information | 1.78 | 3.16 | .006 |
| Vocabulary | 2.00 | 3.73 | .002 |
| Comprehension | 2.67 | 5.22 | <.001 |
| Similarities | 2.11 | 3.17 | .006 |
| Digit Span | 1.56 | 1.95 | .068 |
| Arithmetic | 2.28 | 3.06 | .007 |
| Picture Completion | 2.22 | 3.14 | .006 |
| Picture Arrangement | 0.75 | 0.77 | .459 |
| Block Design | 2.06 | 3.51 | .003 |
| Object Assembly | 0.61 | 0.70 | .491 |
| Digit-Symbol Coding | 1.06 | 2.37 | .030 |
Note: WAIS = Wechsler Adult Intelligence Scales; WAIS-R = Wechsler Adult Intelligence Scales-Revised. The adjustment coefficients represent the difference between the average uncorrected scaled scores obtained on the WAIS minus those obtained on the WAIS-R for a sample of Caucasian subjects matched for age and education (N = 34). Significance for these differences was tested using paired sample t-tests (t- and p-value presented in the table). The differences across versions that were nonsignificant are indicated in italics.