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. Author manuscript; available in PMC: 2011 Jul 1.
Published in final edited form as: Int J Med Inform. 2010 Apr 24;79(7):515–522. doi: 10.1016/j.ijmedinf.2010.03.004

Table I. General Usage Statistics.

Number of Queries After the Removal of Outlier Queries 2,207
Number of Unique Queries After the Removal of Outlier Queries 980
Average Number of Terms Per Query 1.2
Number of Clickthroughs
(Total Number of Queries=4,427)
618 (13.9%)
Number of Unique Users
(Approx # of active users =8,200)
436 (5.3%)