Frequencies for mdcdesc variable in drg1996 dataset :

        Major Diagnostic Category (MDC) |
                            Description |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                                        |          3        0.61        0.61
0: PRINCIPAL DX CAN NOT BE ASSIGNED T.. |         10        2.02        2.63
10: ENDOCRINE, NUTRITIONAL & METABOLI.. |         17        3.43        6.06
11: DISEASES & DISORDERS OF THE KIDNE.. |         32        6.46       12.53
12: DISEASES & DISORDERS OF THE MALE .. |         19        3.84       16.36
13: DISEASES & DISORDERS OF THE FEMAL.. |         17        3.43       19.80
14: PREGNANCY, CHILDBIRTH & THE PUERP.. |         15        3.03       22.83
15: NEWBORNS & OTHER NEONATES WITH CO.. |          7        1.41       24.24
16: DISEASES & DISORDERS OF BLOOD, BL.. |          8        1.62       25.86
17: MYELOPROLIFERATIVE DISEASES & DIS.. |         17        3.43       29.29
18: INFECTIOUS & PARASITIC DISEASES, .. |          9        1.82       31.11
        19: MENTAL DISEASES & DISORDERS |          9        1.82       32.93
1: DISEASES & DISORDERS OF THE NERVOU.. |         35        7.07       40.00
20: ALCOHOL/DRUG USE & ALCOHOL/DRUG I.. |          5        1.01       41.01
21: INJURIES, POISONINGS & TOXIC EFFE.. |         17        3.43       44.44
                              22: BURNS |          6        1.21       45.66
23: FACTORS INFLUENCING HLTH STAT & O.. |          7        1.41       47.07
        24: MULTIPLE SIGNIFICANT TRAUMA |          4        0.81       47.88
25: HUMAN IMMUNODEFICIENCY VIRUS INFE.. |          3        0.61       48.48
     2: DISEASES & DISORDERS OF THE EYE |         13        2.63       51.11
3: DISEASES & DISORDERS OF THE EAR, N.. |         31        6.26       57.37
4: DISEASES & DISORDERS OF THE RESPIR.. |         29        5.86       63.23
5: DISEASES & DISORDERS OF THE CIRCUL.. |         44        8.89       72.12
6: DISEASES & DISORDERS OF THE DIGEST.. |         40        8.08       80.20
7: DISEASES & DISORDERS OF THE HEPATO.. |         20        4.04       84.24
8: DISEASES & DISORDERS OF THE MUSCUL.. |         50       10.10       94.34
9: DISEASES & DISORDERS OF THE SKIN, .. |         28        5.66      100.00
----------------------------------------+-----------------------------------
                                  Total |        495      100.00

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