Table 1.
Correlations of education and age with vocabulary and processing speed measuresa
| Vocabulary Knowledge | Picture Vocabulary | Connections Simple | |
|---|---|---|---|
| Simple correlations | |||
| Education | 0.54*** | 0.45*** | 0.05 |
| Age | 0.04 | 0.16 | −0.64*** |
| Age2 | 0.10 | 0.02 | 0.02 |
| Partial correlations controlling for education | |||
| Education | — | — | — |
| Age | 0.05 | 0.18 | −0.64*** |
| Age2 | −0.03 | −0.10 | 0.00 |
aSimple correlations with Z-transformed scores on the cognitive metrics and partial correlations after controlling for education. Age2, Residuals of age-squared after regressing out actual age in years. Bootstrap (1000) CIs for significant correlations: Education with Vocabulary Knowledge [0.39, 0.67], Picture Vocabulary [0.27, 0.59]; Age with Connections Simple [−0.75, −0.53].
***p < 0.001.