Table 5. Partial correlations between working memory and speech performance scores.

	WM efficiency	WM capacity
	(partial out WM capacity)	(partial out WM efficiency)
SIQ	−0.69**	0.40
SIN	−0.30	0.10
Disyllable	−0.37	0.48*
Tone	−0.28	0.40
SR	−0.13	0.61**

Working memory efficiency was represented by articulation rate data. Working memory capacity was represented by combined forward and digit span data, using PCA data from factor analysis. The reduced data from the PCA were used to statistically control for demographic variables. Each column shows r values when one of the working memory measures was partialled out. WM  =  working memory; SIQ  =  sentence recognition in quiet; SIN  =  sentence recognition in noise; SR  =  self-reported school rank.

*p ≤0.01.

** p ≤0.001.