Table 1.

Baseline characteristics of Low Risk and APOE ε4 groups.

Variable	Low Risk (n = 21)	APOE e4 (n = 24)	p*	Cohen’s d
MMSE	29.29 (0.85)**	29.21 (0.98)	0.78	0.08
DRS-2 memory	24.29 (0.96)	24.04 (1.60)	0.53	0.18
DRS-2 total	141.05 (1.99)	140.33 (3.60)	0.41	0.24
RAVLT delayed recall	9.90 (2.14)	9.75 (2.92)	0.84	0.06
RAVLT trials 1–5	49.33 (8.39)	48.50 (8.17)	0.74	0.10
fMRI task
Famous (% correct)	93.97 (5.23)	91.39 (7.54)	0.19	0.39
Non-famous (% correct)	95.87 (5.76)	97.78 (3.63)	0.20	−0.40
d′	3.29 (0.64)	3.32 (0.62)	0.85	−0.06
Famous (RT, msec)	1236 (180)	1249 (151)	0.81	−0.07
Non-famous (RT, msec)	1622 (354)	1578 (358)	0.68	0.13
IIV famous (RT)	351 (90)	371 (131)	0.57	−0.17
IIV non-famous (RT)	347 (101)	330 (94)	0.56	0.18
Hippocampal volume (% ICV)	0.47 (0.06)	0.46 (0.07)	0.63	0.14

MMSE = Mini Mental State Examination; DRS-2 = Dementia Rating Scale-2; RAVLT = Rey Auditory Verbal Learning Test; RT = reaction time; IIV= intraindividual variability based on the average standard deviation of RTs for correct responses; % ICV = percent intracranial volume.

^*p-Values derived from Student t-test, except for gender (Fischer’s exact test).

^**Mean (standard deviation).