Frequencies for first 10,000 rows of totchron variable in namcs2009 dataset :

  total number of |
          chronic |
       conditions |      Freq.     Percent        Cum.
------------------+-----------------------------------
entire item blank |        150        1.50        1.50
                0 |      4,157       41.57       43.07
                1 |      2,185       21.85       64.92
                2 |      1,526       15.26       80.18
                3 |      1,074       10.74       90.92
                4 |        580        5.80       96.72
                5 |        221        2.21       98.93
                6 |         60        0.60       99.53
                7 |         32        0.32       99.85
                8 |          9        0.09       99.94
                9 |          4        0.04       99.98
               10 |          2        0.02      100.00
------------------+-----------------------------------
            Total |     10,000      100.00

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