Table 3:

Dual-task interference on cognition among genetic low and high risk (APOE ε4 carriers) groups

Cognitive Parameters	Absolute Difference			Dual-Task Effect (DTEc)
	Low Risk Group N=15 Mean (SD)	High Risk Group N=14 Mean (SD)	Effect Size for Group Difference	Low Risk Group N=15 Mean (SD)	High Risk Group N=14 Mean (SD)	Effect Size for Group Difference
Memory (Accuracy)	7.1 (14.1)	3.3 (9.3)	0.31	−11% (27%)	−4% (20%)	0.30
EF Task-normal RT (ms)	50 (70)	20 (70)	0.45	−9% (12%)	−4% (9%)	0.47
EF task-reverse RT (ms)	40 (110)	30 (100)	0.09	−7% (18%)	−4% (13%)	0.16

Absolute difference, difference between parameter in single-task and dual-task condition; DTEc, Dual-Task Effect on cognition: [(dual-task − single-task)/single-task] × 100%. A negative sign precedes the formula when the variable of interest is response time because greater values of response time indicate worse performance; SD, standard deviation; Accuracy, percent of words correctly recalled from the list of 15; RT, response time; EF, executive function task (the go/stop test); values reflect response time.