Table 2.

Selected characteristics of 3,308 elderly included in the Wave II analysis, categorized by dementia status

CharacteristicsNo dementiaIncident dementia
AllAD
Analysis pool includes 33 individuals who were incident cases detected before the start of Wave II and excludes 15 Wave II responders who were diagnosed with prevalent dementia.
* p < 0.01; comparison against non-demented, calculated by two-sample t-tests of means for age and education, and by Pearson χ2 for sex and APOE.
Sex
    Males, n = 1,384 (41.8%)1,322 (95.5%)62 (4.5%)35 (2.5%)
    Females, n = 1,924 (58.2%)1,801 (93.6%)123 (6.4%)88 (4.6%)
    Total, n = 3,308 (100%)3,123 (94.4%)185 (5.6%)123 (3.7%)
Mean age at Wave I, y (SD)73.66 (6.24)80.71 (6.41)*81.20 (6.47)*
Mean education, y (SD)13.40 (2.85)13.02 (3.16)13.10 (2.99)
No. of APOE ε4 alleles (% of column total)
    02,158 (69.1%)104 (56.2%) *69 (56.1%) *
    1873 (28.0%)65 (35.1%)41 (33.3%)
    268 (2.2%)15 (8.1%)12 (9.8%)
    Missing24 (0.8%)1 (0.5%)1 (0.8%)