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Numbers of redundant is-a relations in 5 versions of SNOMED CT regarding to the length of the indirect path. l i represents the number of redundant is-a relations in length of i regarding to the indirect path
| Version | l 2 | l 3 | l 4 | Total |
|---|---|---|---|---|
| 2013-09-01 | 233 | 7 | 0 | 240 |
| 2014-03-01 | 264 | 11 | 2 | 277 |
| 2014-09-01 | 291 | 13 | 1 | 305 |
| 2015-03-01 | 224 | 10 | 1 | 235 |
| 2015-09-01 | 358 | 13 | 1 | 372 |
