Table 1.

Correlations of education and age with vocabulary and processing speed measuresa

Vocabulary KnowledgePicture VocabularyConnections Simple
Simple correlations
    Education0.54***0.45***0.05
    Age0.040.16−0.64***
    Age20.100.020.02
Partial correlations controlling for education
    Education
    Age0.050.18−0.64***
    Age2−0.03−0.100.00
  • 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.