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Table 3 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

From: FEDRR: fast, exhaustive detection of redundant hierarchical relations for quality improvement of large biomedical ontologies

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