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Table 7 Methods and approaches for addressing common scenarios unique to overviews

From: Toward a comprehensive evidence map of overview of systematic review methods: paper 1—purpose, eligibility, search and data extraction

   Methods/approaches proposed in the literaturea
  Scenario for which authors need to plan Eligibility criteria (Table 4) Data extraction (Table 6)
1 Reviews include overlapping information and data (e.g. arising from inclusion of the same primary studies) 1.4.2
1.5 (1.5.1–1.5.4)
1.2
2.2 (2.2.1, 2.2.2)
2 Reviews report discrepant information and dataa 1.4.2
1.6.2, 1.6.3
2.3 (2.3.1–2.3.4)
2.2.1, 2.2.2
2.4 (2.4.1–2.4.5)
3 Data are missing or reviews report varying information (e.g. information on risk of bias is missing or varies across primary studies because reviews use different tools) 1.6.2, 1.6.3 2.4 (2.4.1–2.4.5)
4 Reviews provide incomplete coverage of the overview question (e.g. missing comparisons, populations) 1.6.2, 1.6.3 1.2
2.1.2, 2.1.4
2.4
5 Reviews are not up-to-date 1.4.2
1.6.2, 1.6.3
2.1.2, 2.1.4
6 Review methods raise concerns about bias or quality 1.4.2
1.6.2, 1.6.3
1.2
  1. aThe methods/approaches could be used in combination