Table 5. Correlations (Pearson r) among language measures within siblings.
| Relationship | Phonological memory | Language composite | Sentence composite |
|---|---|---|---|
| Language composite* | 0.53 | ||
| Sentence composite | 0.54 | 0.96 | |
| Vocabulary composite | 0.49 | 0.88 | 0.75 |
Measures in the vocabulary and sentence composites were also part of the language composite and thus the correlations are non-independent.