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. Author manuscript; available in PMC: 2009 Sep 21.
Published in final edited form as: Inf Retr Boston. 2009;12(1):69–80. doi: 10.1007/s10791-008-9074-8

Table 7.

Results of PubMed’s Automatic Term Mapping. The last column shows the number of queries assigned with at least one of the three search tags listed in the columns 3–5. Note that a single query can be assigned with multiple search tags (e.g. parvovirus[MeSH Terms] OR parvovirus[Text Words]). Thus for each row, the sum of the numbers in columns 3 to 5 is greater than the number in the second column (i.e. Queries). Abbreviations: [MeSH], [MeSH Terms]; [Text], [Text Words]; [ALL], [All Fields]

Collection Queries [MeSH] [Text] [ALL] [MeSH] OR [Text] OR [ALL]
TREC 2006 21 17 17 15 21
TREC 2007 34 28 28 23 34
Oct 17, 2005 2.4M 1.5M 1.4M 1.4M 2.0M