Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Distribution of Classes in Each Level of the UMLS Schema, Obtained by Use of the Subclass Definition Rule
| Level | No. Classes | No. Intersection Classes |
|---|---|---|
| 1 | 1 | 0 |
| 2 | 2 | 0 |
| 3 | 4 | 0 |
| 4 | 20 | 0 |
| 5 | 41 | 56 |
| 6 | 23 | 203 |
| 7 | 23 | 163 |
| 8 | 17 | 186 |
| 9 | 2 | 234 |
| 10 | 0 | 212 |
| 11 | 0 | 89 |
| 12 | 0 | 16 |
| 13 | 0 | 3 |
| 14 | 0 | 1 |
