Frequencies for first 10,000 rows of precare variable in natl2017 dataset :

      Month |
   Prenatal |
 Care Began |
      00 No |
   prenatal |
       care |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        110        1.10        1.10
          1 |        215        2.15        3.25
          2 |      3,622       36.22       39.47
          3 |      3,593       35.93       75.40
          4 |        981        9.81       85.21
          5 |        532        5.32       90.53
          6 |        284        2.84       93.37
          7 |        228        2.28       95.65
          8 |        158        1.58       97.23
          9 |         62        0.62       97.85
         99 |        215        2.15      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 19 Sep 2018