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Table 7 Performance of Specificity Filters against Validation Sets.

From: Identifying observational studies of surgical interventions in MEDLINE and EMBASE

  MEDLINE EMBASE MEDLINE/EMBASE Deduplicated
  No filter Filter No filter Filter No filter Filter
PRK       
Reference Standard 39 39 33 32 39 39
Total retrieved 682 452 503 393 792 567
Reference standard retrieved (%)   100.0   97.0   100.0
Reduction in retrievals (%)   33.7   21.9   28.4
Tonsillectomy       
Reference Standard 27 23 27 26 30 30
Total retrieved 1466 886 1213 852 1712 1196
Reference standard retrieved (%)   85.2   96.3   100.0
Reduction in retrievals (%)   39.6   29.8   30.1