Frequencies for first 10,000 rows of precare variable in natl2016 dataset :

      Month |
   Prenatal |
 Care Began |
      00 No |
   prenatal |
       care |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |         84        0.84        0.84
          1 |        225        2.25        3.09
          2 |      3,702       37.02       40.11
          3 |      3,485       34.85       74.96
          4 |      1,056       10.56       85.52
          5 |        507        5.07       90.59
          6 |        303        3.03       93.62
          7 |        259        2.59       96.21
          8 |        155        1.55       97.76
          9 |         67        0.67       98.43
         10 |          4        0.04       98.47
         99 |        153        1.53      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 4 Oct 2017