From: Matching health information seekers' queries to medical terms
 | MeSH Terms | MeSH Synonyms | CISMeF synonyms | Total |
---|---|---|---|---|
1 word | 9,679 | 9,391 | 3,359 | 22,429 |
2 words | 9,833 | 28,051 | 8,258 | 46,142 |
3 words | 4,204 | 19,551 | 6,569 | 30,324 |
4 words and + | 2,503 | 16,992 | 4,924 | 24,419 |