Cochrane Review Group

Methodology

8 systematic reviews in Methodology ask 67 questions. 22.4% have no studies to answer them, 32.8% rest on very low certainty evidence and 16.4% reach moderate or high certainty.

Reviews

Questions

current versions

No studies

22.4%

Moderate or high

16.4%

No studies 15 · 22.4%Ungraded 0 · 0%Very low 22 · 32.8%Low 19 · 28.4%Moderate 8 · 11.9%High 3 · 4.5%

Ungraded means an effect was reported without a GRADE rating; it is not a gap. No studies means the review found nothing to answer the question. The six categories are a display order, not a score.

Search questions in Methodology

Thinnest evidence

All no studies and very low questions

Question	Effect	Evidence	Status / GRADE
Summary of findings. Peer reviewer training vs standard journal practice or no training Inter‐reviewer agreement (final score) Assessed using the average deviation between reviewers, from −4 to 0, higher scores indicate higher agreement. · peer reviewers Reviewer training for improving grant and journal peer review (2023) · Cochrane	no estimate extracted	NR	Very low
Summary of findings. Peer reviewer training vs standard journal practice or no training Bibliometric scores · peer reviewers Reviewer training for improving grant and journal peer review (2023) · Cochrane	no estimate extracted	NR	No studies
Intervention NR Wait‐list compared with no‐treatment · patients with mental health disorders Control interventions in randomised trials among people with mental health disorders (2022) · Cochrane	no estimate extracted	NR	No studies
Intervention NR Non‐serious adverse events for all placebos compared with wait‐list or no treatment (Spontaneous reporting of dichotomous outcomes) (Post‐treatment) · patients with mental health disorders Control interventions in randomised trials among people with mental health disorders (2022) · Cochrane	RD 0.03	14 studies · 590 participants	Very low
Intervention NR Usual care compared with wait‐list/no‐treatment (Variety of continuous outcome) (Post‐treatment) · patients with mental health disorders Control interventions in randomised trials among people with mental health disorders (2022) · Cochrane	no estimate extracted	5 studies · 523 participants	Very low
Intervention NR Serious adverse events for all placebos · patients with mental health disorders Control interventions in randomised trials among people with mental health disorders (2022) · Cochrane	no estimate extracted	NR	No studies
Intervention NR Non‐serious adverse events for all placebos · patients with mental health disorders Control interventions in randomised trials among people with mental health disorders (2022) · Cochrane	no estimate extracted	NR	No studies
Intervention NR Pharmacological placebos compared with wait‐list or no‐treatment (Variety of continuous outcome) (Post‐treatment) · patients with mental health disorders Control interventions in randomised trials among people with mental health disorders (2022) · Cochrane	no estimate extracted	9 studies · 279 participants	Very low
Intervention NR Serious adverse events for all placebos compared with wait‐list or no treatment (Spontaneous reporting of dichotomous outcomes) (Post‐treatment) · patients with mental health disorders Control interventions in randomised trials among people with mental health disorders (2022) · Cochrane	no estimate extracted	11 studies · 517 participants	Very low
Questionnaire design: short vs usual questionnaire Retention [ · trial participants being followed up for data collection Strategies to improve retention in randomised trials (2021) · Cochrane	no estimate extracted	NR	No studies
Monetary incentives: addition of monetary incentives vs addition of a monetary reward Retention [ · trial participants being followed up for data collection Strategies to improve retention in randomised trials (2021) · Cochrane	RR 1 [0.91, 1.09]	4 studies · 3765 participants	Very low
Monetary incentives: addition of monetary reward vs usual follow‐up Retention [ · trial participants being followed up for data collection Strategies to improve retention in randomised trials (2021) · Cochrane	RR 1.02 [0.96, 1.09]	3 studies · 1159 participants	Very low