Table 3.
Correlations between Age and each Span Task and Correlations among all Span Tasks with and without Age Controlled.
| Tasks | Age | SD | Verbal Simple | Verbal Complex | Spatial Simple | Spatial Complex | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Digit | Letter | Word | Read | Count | Operate | Line | Grid | Dot | Parallel | Align | Position | |||
| Digit | −.198 | .083 | .790 | .688 | .588 | .548 | .576 | .342 | .311 | .345 | .356 | .365 | .380 | |
| Letter | −.273 | .082 | .799 | .732 | .573 | .584 | .601 | .389 | .286 | .341 | .397 | .377 | .421 | |
| Word | −.293 | .099 | .703 | .753 | .477 | .495 | .631 | .335 | .275 | .320 | .331 | .343 | .373 | |
| Read | −.314 | .139 | .610 | .609 | .525 | .695 | .654 | .395 | .328 | .385 | .471 | .398 | .459 | |
| Count | −.246 | .143 | .569 | .611 | .531 | .717 | .636 | .355 | .326 | .371 | .452 | .443 | .481 | |
| Operate | −.308 | .131 | .598 | .634 | .664 | .688 | .662 | .339 | .275 | .311 | .394 | .400 | .437 | |
| Line | −.595 | .081 | .387 | .463 | .432 | .488 | .423 | .442 | .593 | .656 | .691 | .576 | .564 | |
| Grid | −.572 | .085 | .363 | .381 | .383 | .435 | .400 | .391 | .731 | .681 | .595 | .643 | .544 | |
| Dot | −.542 | .083 | .392 | .423 | .416 | .478 | .436 | .416 | .765 | .779 | .620 | .617 | .604 | |
| Parallel | −.494 | .130 | .401 | .467 | .420 | .544 | .503 | .478 | .777 | .707 | .721 | .644 | .679 | |
| Align | −.514 | .099 | .409 | .451 | .432 | .486 | .495 | .485 | .703 | .746 | .723 | .734 | .661 | |
| Position | −.468 | .120 | .422 | .486 | .452 | .533 | .527 | .511 | .679 | .662 | .702 | .753 | .742 | |
Note: Correlations above the diagonal are partial correlations with the effect of age controlled. Correlations below the diagonal are based on the raw data and thus include the variance associated with age in addition to all other individual differences. SD = Standard Deviation of the Age Residuals, Read, Count, Operate and Align = Reading, Counting, Operation, and Alignment.