Table 2.
Means, standard deviations, and age correlations for the reference ability variables
| Mean | SD | Age r | |
|---|---|---|---|
| Gf | |||
| Form boards | 7.61 | 4.01 | −.32 |
| Matrix reasoning | 7.77 | 3.26 | −.36 |
| Letter sets | 11.19 | 2.69 | −.17 |
| Paper folding | 6.03 | 2.63 | −.26 |
| Shipley abstraction | 13.57 | 3.34 | −.29 |
| Spatial relations | 8.66 | 4.91 | −.14 |
| Memory | |||
| Paired associates | 2.99 | 1.78 | −.24 |
| Word recall | 35.02 | 6.21 | −.28 |
| Logical memory | 44.63 | 9.87 | −.18 |
| Processing speed | |||
| Letter comparison | 10.45 | 2.32 | −.40 |
| Pattern comparison | 16.26 | 3.46 | −.43 |
| Digit symbol | 73.51 | 16.70 | −.45 |
| Vocabulary | |||
| Antonym vocabulary | 6.59 | 2.97 | .25 |
| Synonym vocabulary | 6.92 | 2.97 | .31 |
| Vocabulary | 49.73 | 12.54 | .15 |
| Picture vocabulary | 18.31 | 5.71 | .31 |
Note. All age correlations are significant at the p < .01 level.