Undocumented or unjustified deviations to the review protocol

Where the methods of systematic review change from the those stated in the protocol, this should be documented and justified in the final report. This problem is addressed in PRISMA 2020, AMSTAR 2 and MECIR.

Articles that support this problem:

Outcome reporting bias in Cochrane systematic reviews: a cross-sectional analysis

2020 : Bmj open

The fate of urological systematic reviews registered in PROSPERO

2019 : World journal of urology

Comparison of non-Cochrane systematic reviews and their published protocols: differences occurred frequently but were seldom explained

2019 : Journal of clinical epidemiology

Publishing protocols of systematic reviews: comparing what was done to what was planned

2002 : Jama

Bias due to changes in specified outcomes during the systematic review process

2010 : Plos one

Discrepancies in outcome reporting exist between protocols and published oral health Cochrane systematic reviews

2015 : Plos one

Bias due to selective inclusion and reporting of outcomes and analyses in systematic reviews of randomised trials of healthcare interventions

2014 : The cochrane library

Selective reporting of outcomes in randomised controlled trials in systematic reviews of cystic fibrosis

2013 : Bmj open

Methodological Quality of Systematic Reviews on Bodyweight Management Strategies for Children and Adolescents

2023 : Medicine & science in sports & exercise

Evidence Mapping Based on Systematic Reviews of Cognitive Behavioral Therapy for Neuropathic Pain

2023 : Neural plasticity

Tripterygium wilfordii Hook. f. Preparations for Rheumatoid Arthritis: An Overview of Systematic Reviews

2022 : Evidence-based complementary & alternative medicine: ecam

The Campbell Collaboration's systematic review of school-based anti-bullying interventions does not meet mandatory methodological standards

2022 : Systematic reviews

Caution should be exercised when assessing ivermectin for the treatment of COVID-19 in systematic reviews

2022 : Reviews in medical virology

Most Cochrane systematic reviews and protocols did not adhere to the Cochrane's risk of bias 2.0 tool

2023 : Revista da associacao medica brasileira

Examining the state, quality and strength of the evidence in the research on built environments and physical activity among adults: An overview of reviews from high income countries

2022 : Health & place

Is the quality of systematic reviews influenced by prospective registration: a methods review of systematic musculoskeletal physical therapy reviews

2022 : Journal of manual & manipulative therapy

Prescription drug monitoring programs evaluation: A systematic review of reviews

2023 : Drug & alcohol dependence

Acupuncture and Related Therapies for Chronic Urticaria: A Critical Overview of Systematic Reviews

2022 : Evidence-based complementary & alternative medicine: ecam

Assessing the magnitude of changes from protocol to publication-a survey on Cochrane and non-Cochrane Systematic Reviews

2023 : Peerj