. Author manuscript; available in PMC: 2014 Mar 1.

Published in final edited form as: Dev Sci. 2013 Mar;16(2):269–286. doi: 10.1111/desc.12024

Table A5.

Correlations Between Processing Speed Tasks and Working Memory Composite Score in Experiment 2

Processing Speed Measure	8- to 16-year-olds	19- to 30-year-olds	60- to 85-year-olds
Box Completion	.218	.076	.242
Digit Copying	.419^**	.101	.313^*
Digit-Symbol Substitution	.586^**	.144	.499^**
Letter Comparison	.477^**	.483^*	.431^**

Note—Simpler processing speed measures loaded on working memory for children (n = 71) and older adults (n = 48), but not for young adults (n = 24).

p < .05;

^**

p < .01. Working Memory composite = average of paragraph recall, Rey-AVLT learning, card rotations (hits-FAs), backward digit span, and coordinative – sequential complexity z scores.