Frequencies for dementia variable in snp2017 dataset :

   Dementia |      Freq.     Percent        Cum.
------------+-----------------------------------
            |      8,898       99.89       99.89
          * |         10        0.11      100.00
------------+-----------------------------------
      Total |      8,908      100.00

by Jean Roth , jroth@nber.org , 6 Dec 2016