Frequencies for first 10,000 rows of lftdif13 variable in h84 dataset :

 DIFFICULTY |
 LIFTING 10 |
     POUNDS |      Freq.     Percent        Cum.
------------+-----------------------------------
         -8 |          2        0.02        0.02
         -1 |      8,973       89.73       89.75
          1 |        417        4.17       93.92
          2 |        345        3.45       97.37
          3 |        141        1.41       98.78
          4 |        122        1.22      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Feb 2018