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. Author manuscript; available in PMC: 2009 Jul 1.

Published in final edited form as: Neurobiol Aging. 2007 Mar 26;29(7):1070–1079. doi: 10.1016/j.neurobiolaging.2007.02.008

Table 1.

Effects of age and speed for hit and correct rejection RT

	β	r²	Increment in r²	F	Percentage attenuation
Hit RT
Model 1
Age	0.359	0.129		5.32^*
Model 2
Speed	0.364	0.133		5.52^*
Age	0.252	0.186	0.053	2.28	58.91
Correct rejection RT
Model 1
Age	0.517	0.267		13.12^*
Model 2
Speed	0.564	0.319		16.84^*
Age	0.343	0.417	0.099	5.91^*	62.92

^*

p < 0.05.