Frequencies for first 10,000 rows of fbg variable in namcs2014 dataset :

  Was blood for fasting |
    blood glucose (FBG) |
      drawn at visit or |
   within past 12 month |      Freq.     Percent        Cum.
------------------------+-----------------------------------
                  Blank |        542        5.42        5.42
N/A, provider not asked |      2,703       27.03       32.45
                    Yes |      2,059       20.59       53.04
             None found |      4,696       46.96      100.00
------------------------+-----------------------------------
                  Total |     10,000      100.00

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