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Table 1 POEMs Evaluation Study. A comparison of the accuracy and efficiency of ask MEDLINE and Entrez PubMed in retrieving an exact match to cited references in POEMs in BMJ.

From: ask MEDLINE: a free-text, natural language query tool for MEDLINE/PubMed

Search Step ask MEDLINE exact match retrieved/total questions (% total) Entrez PubMed exact match retrieved/total questions (% total)
A. Match at first pass 59/95 (62.1) 13/95 (13.7)
B. Match after a related citation search 11/95 (11.6) 8/95 (8.4)
C. Match after question rephrase 2/95 (2.1) 0/95 (0)
Total exact match after A, B, and C 75.8% 22.1
No match after A, B, and C, but relevant articles retrieved 20/95 (21) 16/95 (16.8)
Overall efficiency 96.8% 38.9%
Citations retrieved, but not matched or relevant 3/95 (3.1) 6/95 (6.3)
No citations retrieved 0/95 (0) 52/95 (54.7)
Overall retrieval failure 3.1% 61%