Table 3.
Distribution of Classes in Each Level of the UMLS Schema, Obtained by Use of the Straightforward Model
| Level | No. Classes | No. Intersection Classes |
|---|---|---|
| 1 | 1 | 0 |
| 2 | 2 | 0 |
| 3 | 4 | 0 |
| 4 | 20 | 0 |
| 5 | 41 | 62 |
| 6 | 23 | 218 |
| 7 | 23 | 172 |
| 8 | 17 | 240 |
| 9 | 2 | 401 |
| 10 | 0 | 70 |
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