TABLE 2.

Mean d’ and β estimates of response biases in older and younger adults.

	Index	Young	Older	p-value
Frequent	d’	4.25	4.09	0.246a
	β	2.25	1.34	0.007b**
Infrequent	d’	4.43	3.9	0.001a**
	β	1.77	1.47	0.098b

The calculations of the d’ and β are based on Equations (1, 2), respectively. ^aTwo-sample t-test. ^bMann-Whitney U-test. ** denotes p < 0.001.