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Table 5 Average number of documents retrieved by CISS and the 3 other approaches in English

From: Surveillance for the prevention of chronic diseases through information association

Search engine +§ +/-§ -/+§ -§ Mean Median
Google 1.0 0.2 3.0 4.2 14028687 255000
Google scholar 1.2 0.6 3.6 1.4 12058.8 1190
PubMed 0.0 0.8 1.2 0.2 18.0 0.0
CISS 0.4 1.2 0.8 0.0 2.4 1.0
  1. §Columns relative to the 10 first results for each query at each engine.
  2. Mean of all results for each query.
  3. Median of all results for each query.