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. 2013 May 14;3(5):e256. doi: 10.1038/tp.2013.13

Table 1. Characteristics of the study sample.

Characteristics  
Number of cases with AD 11 840
Number of controls 10 931
Age at Onset for AD cases (s.d.) 74.55 (6.8)
Age at last exam for controls (s.d.) 76.26 (7.2)
Proportion of females 59.66%
   
Frequency of APOE e4+
 Cases 0.38
 Controls 0.14
   
Frequency of APOE e4−
 Cases 0.62
 Controls 0.86

Abbreviation: AD, Alzheimer's disease; APOE, apolipoprotein E.