Table I.

Behavioral performance during the N‐back task

	Carriers (T/C)		Noncarriers (C/C)		U	P a
	Mean	MR	Mean	MR
Hits
0‐back	28.00	27.50	27.86	24.05	262.5	n.s.
2‐back	25.45	27.35	25.83	23.38	243.0	n.s.
False alarms
0‐back	0.50	21.15	0.69	22.57	235.0	n.s.
2‐back	0.80	23.18	0.93	26.26	253.5	n.s.
	Mean	SD	Mean	SD	F	P b
Reaction time (ms)
0‐back	388.74	60.56	381.67	35.15	0.27	n.s.
2‐back	448.14	77.66	445.39	59.12	0.02	n.s.

MR, mean rank; SD, standard deviation.

n.s., nonsignificant (all P > 0.5).

^aMann–Whitney U‐test.

^bTwo‐sample t‐test.