Skip to main content

Table 2 Methods identified from the MOoR Framework mapped to newly identified studies

From: Managing overlap of primary study results across systematic reviews: practical considerations for authors of overviews of reviews

Step in the conduct of an overview Methods identified from the MOoR framework [7, 16] Methods studies Case studies
Eligibility criteria step Include all reviews (manage overlap at other stages) Pollock [28, 31] Murphy [23]
Patnode [27]
Select one (or more) reviews using pre-specified eligibility criteria Ballard [29]; Hennessy [17, 30]; Pollock [18]; Pollock [19, 28, 31] Bidonde [22]
Patnode [27]
Prousali [24]
Thabet [26]
Select one review from multiple addressing the same question using pre-specified decision rules (e.g. combine one or more eligibility criteria in an algorithm) Hennessy [17, 30]; Pollock [18]; Pollock [19, 28] Ryan [25]
Exclude reviews that do not contain any unique primary studies, when there are multiple reviews Hennessey [30]; Pollock [18]; Pollock [28] Ryan [25] (a cut-off of 50% unique primary studies was used)
Data extraction step Extract all reviews (manage overlap at other stages) Pollock [19] Bidonde [22]
Patnode [27]
Prousali [24]
Thabet [26]
Extract data from only one (or more) reviews using pre-specified eligibility criteria Pollock [19, 31] Murphy [23]
Patnode [27]
Assessment of risk of bias step Select one (or more) high quality reviews, or exclude low quality reviews, using pre-specified criteria Hennessy [17]; Pollock [19, 28] Murphy [23]
Patnode [27]
Prousali [24]
Ryan [25]
Synthesis and presentation and summary of findings step Quantifying the amount of overlap (e.g. CCA [13]) Ballard [29]; Hennessy [17, 30]; Pollock [18]; Pollock [19, 28, 31] Bidonde [22]
Murphy [23]
Patnode [27]
Prousali [24]
Ryan [25]a
Thabet [26]
Visually present overlap (e.g. matrix, figures) Hennessy [17, 30]; Pollock [19, 28, 31]; Bougioukas [33] Bidonde [22]
Murphy [23]
Patnode [27]
Prousali [24]
Thabet
Select one review (e.g. high quality and comprehensive review using decision rules) Hennessey [30] Patnode [27]
Ryan [25]
Use a statistical method (e.g. conduct sensitivity analyses, inflate the variance of the pooled meta-analysis estimate) Hennessey [30] Patnode [27]
  1. aCochrane reviews with approximately 50% or more of their studies already captured by Cochrane reviews were excluded