Table 2.
Correlations Among All Measures
| Measure | 1. | 2. | 3. | 4. | 5. | 6. | 7. | 8. | 9. | 10. | 11. | 12. |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1. Symbol Search | .77 | |||||||||||
| 2. Digit Symbol Coding | .51** | .84 | ||||||||||
| 3. PM N Back | −.03 | .11 | .62 | |||||||||
| 4. Operation Span | .08 | .10 | .36 ** | .77 | ||||||||
| 5. Listening Span | .05 | −.04 | .30 ** | .54** | .74 | |||||||
| 6. WM N Back | .05 | .13 | .35 ** | .32 ** | .41** | .77 | ||||||
| 7. Story Recall | .02 | .00 | .15* | .24 ** | .31 ** | .30 ** | .64 | |||||
| 8. Verbal Paired Associates I | .05 | .11 | .17 * | .07 | .07 | .16 * | .25 ** | .86 | ||||
| 9. Family Pictures I | .15 | .07 | .08 | .06 | .17 * | .13 | .28 ** | .22 ** | .72 | |||
| 10. Raven’s | .06 | .09 | .22 ** | .29 ** | .33 ** | .38 ** | .20 ** | .07 | .20 ** | .75 | ||
| 11. Block Design | .27 ** | .11 | .29 ** | .29 ** | .31 ** | .34 ** | .15 * | .17 * | .28 ** | .41 ** | .75 | |
| 12. Matrix Reasoning | .14 | .12 | .19 * | .18 ** | .26 ** | .32 ** | .20 ** | .18 * | .21 ** | .40 ** | .40 ** | .65 |
**
Note: represents p < 0.01,
*
represents p < 0.05. Italicized numbers on the diagonal represent Cronbach’s Alpha measure of internal consistency, reported from the raw data, with the exception of the two measures of processing speed. As these were speeded measures, test-retest stability coefficients were used instead. These values are reported from the normed values available in the Technical Manual, across the normative sample (Wechsler, 1997a).