Frequencies for mdcdesc variable in drg1997 dataset :

        Major Diagnostic Category (MDC) |
                            Description |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                                        |          7        1.41        1.41
0: PRINCIPAL DX CAN NOT BE ASSIGNED T.. |         10        2.02        3.43
10: ENDOCRINE, NUTRITIONAL & METABOLI.. |         17        3.43        6.87
11: DISEASES & DISORDERS OF THE KIDNE.. |         32        6.46       13.33
12: DISEASES & DISORDERS OF THE MALE .. |         19        3.84       17.17
13: DISEASES & DISORDERS OF THE FEMAL.. |         17        3.43       20.61
14: PREGNANCY, CHILDBIRTH & THE PUERP.. |         15        3.03       23.64
15: NEWBORNS & OTHER NEONATES WITH CO.. |          7        1.41       25.05
16: DISEASES & DISORDERS OF BLOOD, BL.. |          8        1.62       26.67
17: MYELOPROLIFERATIVE DISEASES & DIS.. |         17        3.43       30.10
18: INFECTIOUS & PARASITIC DISEASES, .. |          9        1.82       31.92
        19: MENTAL DISEASES & DISORDERS |          9        1.82       33.74
1: DISEASES & DISORDERS OF THE NERVOU.. |         35        7.07       40.81
20: ALCOHOL/DRUG USE & ALCOHOL/DRUG I.. |          5        1.01       41.82
21: INJURIES, POISONINGS & TOXIC EFFE.. |         17        3.43       45.25
                              22: BURNS |          6        1.21       46.46
23: FACTORS INFLUENCING HLTH STAT & O.. |          7        1.41       47.88
        24: MULTIPLE SIGNIFICANT TRAUMA |          4        0.81       48.69
25: HUMAN IMMUNODEFICIENCY VIRUS INFE.. |          3        0.61       49.29
     2: DISEASES & DISORDERS OF THE EYE |         13        2.63       51.92
3: DISEASES & DISORDERS OF THE EAR, N.. |         31        6.26       58.18
4: DISEASES & DISORDERS OF THE RESPIR.. |         29        5.86       64.04
5: DISEASES & DISORDERS OF THE CIRCUL.. |         44        8.89       72.93
6: DISEASES & DISORDERS OF THE DIGEST.. |         40        8.08       81.01
7: DISEASES & DISORDERS OF THE HEPATO.. |         20        4.04       85.05
8: DISEASES & DISORDERS OF THE MUSCUL.. |         46        9.29       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