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

No Maternal |
  Morbidity |
 Reported 1 |
       True |      Freq.     Percent        Cum.
------------+-----------------------------------
          0 |        178        1.78        1.78
          1 |      9,765       97.65       99.43
          9 |         57        0.57      100.00
------------+-----------------------------------
      Total |     10,000      100.00

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