Frequencies for mdcdesc variable in drg1993 dataset :

        Major Diagnostic Category (MDC) |
                            Description |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                                        |          3        0.61        0.61
0: PRINCIPAL DX CAN NOT BE ASSIGNED T.. |          9        1.83        2.44
10: ENDOCRINE, NUTRITIONAL & METABOLI.. |         17        3.46        5.89
11: DISEASES & DISORDERS OF THE KIDNE.. |         32        6.50       12.40
12: DISEASES & DISORDERS OF THE MALE .. |         19        3.86       16.26
13: DISEASES & DISORDERS OF THE FEMAL.. |         17        3.46       19.72
14: PREGNANCY, CHILDBIRTH & THE PUERP.. |         15        3.05       22.76
15: NEWBORNS & OTHER NEONATES WITH CO.. |          7        1.42       24.19
16: DISEASES & DISORDERS OF BLOOD, BL.. |          8        1.63       25.81
17: MYELOPROLIFERATIVE DISEASES & DIS.. |         17        3.46       29.27
18: INFECTIOUS & PARASITIC DISEASES, .. |          9        1.83       31.10
        19: MENTAL DISEASES & DISORDERS |          9        1.83       32.93
1: DISEASES & DISORDERS OF THE NERVOU.. |         35        7.11       40.04
20: ALCOHOL/DRUG USE & ALCOHOL/DRUG I.. |          5        1.02       41.06
21: INJURIES, POISONINGS & TOXIC EFFE.. |         17        3.46       44.51
                              22: BURNS |          6        1.22       45.73
23: FACTORS INFLUENCING HLTH STAT & O.. |          7        1.42       47.15
        24: MULTIPLE SIGNIFICANT TRAUMA |          4        0.81       47.97
25: HUMAN IMMUNODEFICIENCY VIRUS INFE.. |          3        0.61       48.58
     2: DISEASES & DISORDERS OF THE EYE |         13        2.64       51.22
3: DISEASES & DISORDERS OF THE EAR, N.. |         31        6.30       57.52
4: DISEASES & DISORDERS OF THE RESPIR.. |         29        5.89       63.41
5: DISEASES & DISORDERS OF THE CIRCUL.. |         44        8.94       72.36
6: DISEASES & DISORDERS OF THE DIGEST.. |         40        8.13       80.49
7: DISEASES & DISORDERS OF THE HEPATO.. |         18        3.66       84.15
8: DISEASES & DISORDERS OF THE MUSCUL.. |         50       10.16       94.31
9: DISEASES & DISORDERS OF THE SKIN, .. |         28        5.69      100.00
----------------------------------------+-----------------------------------
                                  Total |        492      100.00

by Jean Roth , jroth@nber.org , 22 Apr 2016