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Table 3 Queries that yielded no articles in the PubMed result list, queries that resulted in abstract selection and queries that resulted in full-text selection in relation to the number of terms used.

From: Analysis of queries sent to PubMed at the point of care: Observation of search behaviour in a medical teaching hospital

Terms Query result
  No articles retrieved by query Abstract selected Full-text selected
  n/N(%) n/N(%) n/N(%)
1 101/619 (16) 79/619 (13) 28/619 (5)
2 197/998 (20) 291/998 (29) 108/998 (11)
3 174/716 (24) 277/716 (39) 131/716 (18)
4 86/346 (25) 145/346 (42) 80/346 (23)
5 42/149 (28) 64/149 (43) 32/149 (21)
6 13/39 (33) 12/39 (31) 9/39 (23)
  1. Selection of 2867 queries containing no Mesh headings, limits, wildcards or special operators, "AND" operator allowed. Queries containing more than 6 terms excluded.