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Table 1 Comprehensiveness of different inclusion scenarios

From: A decision tool to help researchers make decisions about including systematic reviews in overviews of reviews of healthcare interventions

Inclusion scenario Amount of outcome data lost of changed per overview (%)
Acute asthma Acute otitis media Bronchiolitis Croup Eczema Gastroenteritis Procedural sedation
Full inclusion scenario (include all Cochrane and non-Cochrane SRs) 0 0 0 0 0 0 0
First restricted scenario (include only Cochrane SRs) 28 54 13 0 67 31 0
Second restricted scenario (include all non-overlapping SRs and select the Cochrane SR for groups of overlapping SRs) 4 39 13 0 39 31 Unknowna
Third restricted scenario (include all non-overlapping SRs and select the most recent SR for groups of overlapping SRs) 12 39 13 0 48 34 Unknowna
Fourth restricted scenario (include all non-overlapping SRs and select the highest quality SR for groups of overlapping SRs) 4 Unknowna 13 0 Unknowna 31 Unknowna
  1. aUnable to calculate amount of outcome data loss and change because data for the comparator groups were often not available (procedural sedation overview) or because multiple systematic reviews were tied for “highest quality” (fourth restricted scenario)
  2. Modified from Pollock et al. [9]