Frequencies for first 10,000 rows of fbg variable in nhamcsopd2011 dataset :

   Was fasting blood glucose (FBG) |
    drawn within 12 months of this |
                            visit? |      Freq.     Percent        Cum.
-----------------------------------+-----------------------------------
                             Blank |      2,307       23.07       23.07
Not applicable, provider not asked |        218        2.18       25.25
                               Yes |      1,754       17.54       42.79
       None found within 12 months |      5,721       57.21      100.00
-----------------------------------+-----------------------------------
                             Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016