Frequencies for mdcdesc variable in drg1990 dataset :

        Major Diagnostic Category (MDC) |
                            Description |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
0: PRINCIPAL DX CAN NOT BE ASSIGNED T.. |          6        1.26        1.26
10: ENDOCRINE, NUTRITIONAL & METABOLI.. |         17        3.56        4.81
11: DISEASES & DISORDERS OF THE KIDNE.. |         32        6.69       11.51
12: DISEASES & DISORDERS OF THE MALE .. |         19        3.97       15.48
13: DISEASES & DISORDERS OF THE FEMAL.. |         17        3.56       19.04
14: PREGNANCY, CHILDBIRTH & THE PUERP.. |         15        3.14       22.18
15: NEWBORNS & OTHER NEONATES WITH CO.. |          7        1.46       23.64
16: DISEASES & DISORDERS OF BLOOD, BL.. |          8        1.67       25.31
17: MYELOPROLIFERATIVE DISEASES & DIS.. |         16        3.35       28.66
18: INFECTIOUS & PARASITIC DISEASES, .. |          9        1.88       30.54
        19: MENTAL DISEASES & DISORDERS |          9        1.88       32.43
1: DISEASES & DISORDERS OF THE NERVOU.. |         35        7.32       39.75
20: ALCOHOL/DRUG USE & ALCOHOL/DRUG I.. |          6        1.26       41.00
21: INJURIES, POISONINGS & TOXIC EFFE.. |         17        3.56       44.56
                              22: BURNS |          6        1.26       45.82
23: FACTORS INFLUENCING HLTH STAT & O.. |          7        1.46       47.28
     2: DISEASES & DISORDERS OF THE EYE |         13        2.72       50.00
3: DISEASES & DISORDERS OF THE EAR, N.. |         31        6.49       56.49
4: DISEASES & DISORDERS OF THE RESPIR.. |         30        6.28       62.76
5: DISEASES & DISORDERS OF THE CIRCUL.. |         43        9.00       71.76
6: DISEASES & DISORDERS OF THE DIGEST.. |         40        8.37       80.13
7: DISEASES & DISORDERS OF THE HEPATO.. |         18        3.77       83.89
8: DISEASES & DISORDERS OF THE MUSCUL.. |         49       10.25       94.14
9: DISEASES & DISORDERS OF THE SKIN, .. |         28        5.86      100.00
----------------------------------------+-----------------------------------
                                  Total |        478      100.00

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