Table 3.
Correlation Coefficients for Principal Measures and WM Factor Scores: Simple Correlations in Lower Triangle, Partial Correlations Controlling for Matrix Reasoning in Upper Triangle
| Digit span | Backward digit span | Dot matrix | Mr X | Verbal WM | Visuo-spatial WM | Vocabulary | Reading | WIAT maths | WJ maths | |
|---|---|---|---|---|---|---|---|---|---|---|
| Digit span | 1 | 0.391** | 0.200** | 0.219** | 0.885** | 0.205** | 0.314** | 0.359** | 0.164* | 0.293* |
| Backward digit span | .433** | 1 | 0.234** | 0.295** | 0.773** | 0.414** | 0.292** | 0.338** | 0.267** | 0.355** |
| Dot matrix | .254** | .320** | 1 | 0.293** | 0.226** | 0.805** | 0.127 | 0.189** | 0.272** | 0.100 |
| Mr X | .260** | .354** | .349** | 1 | 0.313** | 0.789** | 0.169* | 0.048 | 0.259** | 0.205 |
| Verbal WM | .892** | .743** | 0.135 | .207** | 1 | 0.339** | 0.363** | 0.412** | 0.247** | 0.383** |
| Visuo-spatial WM | 0.076 | .338** | .817** | .776** | - | 1 | 0.186** | 0.155* | 0.342** | 0.200 |
| Vocabulary | .374** | .416** | .270** | .268** | .415** | .254** | 1 | 0.396** | 0.195* | 0.425** |
| Reading | .402** | .414** | .274** | 0.125 | .449** | .163* | .490** | 1 | 0.340** | 0.396** |
| WIAT maths | .247** | .394** | .385** | .342** | .275** | .404** | .408** | .444** | 1 | - |
| WJ maths | .356** | .464** | 0.245 | .297* | .443** | .261* | .576** | .489** | - | 1 |
| Matrix reasoning | .215** | .350** | .321** | .247** | .256** | .315** | .519** | .329** | .509** | .507** |
*
p < .05.
**
p < .01.