Frequencies for first 10,000 rows of fbg variable in namcs2012 dataset :

  Was blood for fasting |
    blood glucose (FBG) |
      drawn at visit or |
   within past 12 month |      Freq.     Percent        Cum.
------------------------+-----------------------------------
                  Blank |        717        7.17        7.17
N/A, provider not asked |      2,900       29.00       36.17
                    Yes |      1,105       11.05       47.22
             None found |      5,278       52.78      100.00
------------------------+-----------------------------------
                  Total |     10,000      100.00

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