Frequencies for mdcdesc variable in drg1998 dataset :

        Major Diagnostic Category (MDC) |
                            Description |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                                        |         12        2.39        2.39
0: PRINCIPAL DX CAN NOT BE ASSIGNED T.. |         10        1.99        4.37
10: ENDOCRINE, NUTRITIONAL & METABOLI.. |         17        3.38        7.75
11: DISEASES & DISORDERS OF THE KIDNE.. |         32        6.36       14.12
12: DISEASES & DISORDERS OF THE MALE .. |         19        3.78       17.89
13: DISEASES & DISORDERS OF THE FEMAL.. |         17        3.38       21.27
14: PREGNANCY, CHILDBIRTH & THE PUERP.. |         15        2.98       24.25
15: NEWBORNS & OTHER NEONATES WITH CO.. |          7        1.39       25.65
16: DISEASES & DISORDERS OF BLOOD, BL.. |          8        1.59       27.24
17: MYELOPROLIFERATIVE DISEASES & DIS.. |         17        3.38       30.62
18: INFECTIOUS & PARASITIC DISEASES, .. |          9        1.79       32.41
        19: MENTAL DISEASES & DISORDERS |          9        1.79       34.19
1: DISEASES & DISORDERS OF THE NERVOU.. |         35        6.96       41.15
20: ALCOHOL/DRUG USE & ALCOHOL/DRUG I.. |          5        0.99       42.15
21: INJURIES, POISONINGS & TOXIC EFFE.. |         17        3.38       45.53
23: FACTORS INFLUENCING HLTH STAT & O.. |          7        1.39       46.92
        24: MULTIPLE SIGNIFICANT TRAUMA |          4        0.80       47.71
25: HUMAN IMMUNODEFICIENCY VIRUS INFE.. |          3        0.60       48.31
     2: DISEASES & DISORDERS OF THE EYE |         13        2.58       50.89
3: DISEASES & DISORDERS OF THE EAR, N.. |         31        6.16       57.06
4: DISEASES & DISORDERS OF THE RESPIR.. |         29        5.77       62.82
5: DISEASES & DISORDERS OF THE CIRCUL.. |         45        8.95       71.77
6: DISEASES & DISORDERS OF THE DIGEST.. |         40        7.95       79.72
7: DISEASES & DISORDERS OF THE HEPATO.. |         20        3.98       83.70
8: DISEASES & DISORDERS OF THE MUSCUL.. |         54       10.74       94.43
9: DISEASES & DISORDERS OF THE SKIN, .. |         28        5.57      100.00
----------------------------------------+-----------------------------------
                                  Total |        503      100.00

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