http://www.neurology.org/content/75/9/7 ... 00fb57318a(- -)
Results:
At age 70, cohort 1930 performed better on psychometric tests, and had fewer recent memory problems compared to cohort 1901–1902. During 5-year follow-up, 5.0% in cohort 1901–1902 and 4.4% in cohort 1930 (p = 0.742) developed dementia, and 15.7% in cohort 1901–1902 and 4.4% in cohort 1930 died (p < 0.001). Recent memory was associated with incident dementia in both cohorts. Low scores in nonmemory tests were associated with incident dementia in cohort 1901–1902, but not in cohort 1930. Recent memory problems and lower scores in nonmemory tests were associated with 5-year mortality in cohort 1901–1902, but not in cohort 1930.
Tämä tarkoittaa, että esimerkiksi tietomäärän heikkous (yms.) ennusti dementiaa ja kuolemia 1901 - 1902 -kohortissa
mutta ei kohortissa 1930. So. nykyiset dementtisetkin ovat jyvällä maaliman tapahtumista (yms.).