Frequencies for first 10,000 rows of fbg variable in namcs2013 dataset :

  Was blood for fasting |
    blood glucose (FBG) |
      drawn at visit or |
   within past 12 month |      Freq.     Percent        Cum.
------------------------+-----------------------------------
                  Blank |        670        6.70        6.70
N/A, provider not asked |      2,741       27.41       34.11
                    Yes |      1,608       16.08       50.19
             None found |      4,981       49.81      100.00
------------------------+-----------------------------------
                  Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 27 Mar 2017