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. Author manuscript; available in PMC: 2013 Feb 28.
Published in final edited form as: N Engl J Med. 2012 Jul 11;367(9):795–804. doi: 10.1056/NEJMoa1202753

Table 1.

Characteristics of the Study Participants.*

Characteristic Carriers
(N = 88)
Noncarriers
(N = 40)
P Value
Age — yr 39.1±10.3 39.5±8.9 0.92
Male sex — no. (%) 36 (41) 17 (42) 0.85
Education level — yr 13.9±2.5 15.0±2.5 0.04
Cognitive status — no. (%)
      Symptomatic 43 (49) 1 (2) 0.29
      Asymptomatic 45 (51) 39 (98)
Positive for apolipoprotein E ε4 allele — no. (%) 22 (25) 9 (22) 0.69
*

Plus–minus values are means ±SD.

Participants were defined as asymptomatic if they had Cognitive Dementia Rating scores of 0 (no cognitive decline) and as symptomatic if they had scores greater than 0.