Frequencies for first 10,000 rows of totchron variable in namcs2007 dataset :

  total number of |
          chronic |
       conditions |      Freq.     Percent        Cum.
------------------+-----------------------------------
entire item blank |        240        2.40        2.40
                0 |      4,554       45.54       47.94
                1 |      2,334       23.34       71.28
                2 |      1,384       13.84       85.12
                3 |        848        8.48       93.60
                4 |        385        3.85       97.45
                5 |        165        1.65       99.10
                6 |         54        0.54       99.64
                7 |         28        0.28       99.92
                8 |          7        0.07       99.99
                9 |          1        0.01      100.00
------------------+-----------------------------------
            Total |     10,000      100.00

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