. 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 2b.

Hierarchical Regression Examining Contributions of Increasingly Complex Processing Speed Measures to the Working Memory Composite Score in the Young Adult Sub-Sample of Experiment 2.

Processing Speed Measure	ΔR²	F for Δ	df
Box Completion	.006	0.1	1,22
Digit Copying	.005	0.1	1,21
Digit-Symbol Substitution	.015	0.3	1,20
Letter Comparison	.248^*	6.5	1,19

Note— More complex processing speed measures predict additional working memory variance in young adults. n = 24;

p < .05;

^**

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