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

Were triglycerides drawn within 12 |
             months of this visit? |      Freq.     Percent        Cum.
-----------------------------------+-----------------------------------
                             Blank |      2,313       23.13       23.13
Not applicable, provider not asked |        218        2.18       25.31
                               Yes |      1,824       18.24       43.55
       None found within 12 months |      5,645       56.45      100.00
-----------------------------------+-----------------------------------
                             Total |     10,000      100.00

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