Frequencies for mdcdesc variable in drg1994 dataset :

        Major Diagnostic Category (MDC) |
                            Description |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                                        |          3        0.61        0.61
0: PRINCIPAL DX CAN NOT BE ASSIGNED T.. |          9        1.82        2.43
10: ENDOCRINE, NUTRITIONAL & METABOLI.. |         17        3.44        5.87
11: DISEASES & DISORDERS OF THE KIDNE.. |         32        6.48       12.35
12: DISEASES & DISORDERS OF THE MALE .. |         19        3.85       16.19
13: DISEASES & DISORDERS OF THE FEMAL.. |         17        3.44       19.64
14: PREGNANCY, CHILDBIRTH & THE PUERP.. |         15        3.04       22.67
15: NEWBORNS & OTHER NEONATES WITH CO.. |          7        1.42       24.09
16: DISEASES & DISORDERS OF BLOOD, BL.. |          8        1.62       25.71
17: MYELOPROLIFERATIVE DISEASES & DIS.. |         17        3.44       29.15
18: INFECTIOUS & PARASITIC DISEASES, .. |          9        1.82       30.97
        19: MENTAL DISEASES & DISORDERS |          9        1.82       32.79
1: DISEASES & DISORDERS OF THE NERVOU.. |         35        7.09       39.88
20: ALCOHOL/DRUG USE & ALCOHOL/DRUG I.. |          5        1.01       40.89
21: INJURIES, POISONINGS & TOXIC EFFE.. |         17        3.44       44.33
                              22: BURNS |          6        1.21       45.55
23: FACTORS INFLUENCING HLTH STAT & O.. |          7        1.42       46.96
        24: MULTIPLE SIGNIFICANT TRAUMA |          4        0.81       47.77
25: HUMAN IMMUNODEFICIENCY VIRUS INFE.. |          3        0.61       48.38
     2: DISEASES & DISORDERS OF THE EYE |         13        2.63       51.01
3: DISEASES & DISORDERS OF THE EAR, N.. |         31        6.28       57.29
4: DISEASES & DISORDERS OF THE RESPIR.. |         29        5.87       63.16
5: DISEASES & DISORDERS OF THE CIRCUL.. |         44        8.91       72.06
6: DISEASES & DISORDERS OF THE DIGEST.. |         40        8.10       80.16
7: DISEASES & DISORDERS OF THE HEPATO.. |         20        4.05       84.21
8: DISEASES & DISORDERS OF THE MUSCUL.. |         50       10.12       94.33
9: DISEASES & DISORDERS OF THE SKIN, .. |         28        5.67      100.00
----------------------------------------+-----------------------------------
                                  Total |        494      100.00

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