scholarly journals Additional Search Strategies May Not Be Necessary for a Rapid Systematic Review

2015 ◽  
Vol 10 (2) ◽  
pp. 150
Author(s):  
Joanne L. Jordan
Keyword(s):  
Systematic Review ◽  
Systematic Reviews ◽  
Reference Lists ◽  
Meta Analysis ◽  
Search Strategies ◽  
Risk Of Bias ◽  
Chronic Depression ◽  
Randomized Controlled ◽  
Central Database

A Review of: Westphal, A., Kriston, L., Hölzel, L.P., Härter, M., & von Wolff, A. (2014). Efficiency and contribution of strategies for finding randomized controlled trials: a case study from a systematic review on therapeutic interventions of chronic depression. Journal of Public Health Research, 3(2), 177. doi: 10.4081/jphr.2014.177 Abstract Objective – To evaluate the efficiency and contribution of additional searching strategies for finding randomized controlled trials (RCTs) in a systematic review. Design – A methodological case study. Setting – Biomedical literature. Methods – A sensitive search (defined as “the ratio of the number of relevant reports identified to the total number of relevant reports in existence”) was conducted of electronic databases, Cochrane CENTRAL database, MEDLINE, EMBASE, PsycInfo, CINAHL, BIOSIS, and Web of Science databases (Science and Social Science Citation Indexes). The following additional searching strategies were conducted: hand-searching contents of relevant journals (Archives of General Psychiatry, Journal of Consulting and Clinical Psychology, and Journal of Affective Disorders), citation tracking (forwards tracking using Social Science and Science Citation Index and backwards tracking by looking through reference lists of included studies), screening reference lists of relevant systematic reviews, searching clinical trials registers (ClinicalTrials.gov and ICTRP registers), and contacting first authors of included studies to find any similar unpublished studies. The number of articles identified by each of these methods was recorded and screened for inclusion in the systematic review. The authors calculated what they labelled as the ‘efficiency’ of each searching strategy (the number of included studies identified by the search method as a proportion of the full text articles screened) and the ‘contribution’ of the search strategies (the ratio of included studies identified by that method to the final number of included studies in the systematic review). The methodological quality of each included study was assessed using the Cochrane Risk of Bias Tool, which is a critical appraisal checklist used to judge the study’s value in the systematic review. The meta-analysis in the systematic review was conducted with and without the studies identified by the additional searching strategies to assess their impact on the review’s findings. Main Results – In total 50 studies were identified, 42 from electronic database searches and 8 from additional search strategies. As illustrated by the results in Table 1, the most useful additional search strategy was screening reference lists of relevant systematic reviews. Journal hand-searching and contacting authors also contributed to the review. Of the eight studies identified by the additional search strategies none were judged to have a low risk of bias (four had high risk of bias and four were unclear). Of the 42 included studies from electronic searches only 11 were judged to have a low risk of bias, whereas 9 studies had a high risk of bias and 22 were unclear. Excluding the eight studies retrieved from additional search strategies in the systematic review meta-analysis did not influence the results on the effectiveness of the different interventions for chronic depression. These studies were found to be indexed correctly on the electronic databases, but were not identified in the initial search. Conclusion – Additional search strategies, especially screening reference lists of systematic reviews and hand-searching relevant journals, retrieved a substantial number of relevant studies for a systematic review of interventions for treating chronic depression. However, results of the review’s meta-analysis did not differ when these additional studies (rated as either high or unclear risk of bias) were not included and search methods were time consuming. It might be reasonable to rely on electronic searching strategies when resources for conducting a systematic review are limited or when doing a “rapid review.” The benefits and limitations of additional search strategies should be considered particularly when resources or time for conducting a systematic review are limited. If the electronic database search is sensitive and includes the Cochrane CENTRAL database additional search strategies may not be necessary, but these findings should be tested in other research areas.

Systematic review protocol examining the effectiveness of non-Invasive Stimulation Techniques to Collect Urine in Newborn and Infants (Preprint)

2020 ◽  
Author(s):  
Ting Wan Tan ◽  
Han Ling Tan ◽  
Chih Ming Chang
Keyword(s):  
Systematic Review ◽  
Urine Sample ◽  
Systematic Reviews ◽  
Meta Analysis ◽  
Risk Of Bias ◽  
Systemic Review ◽  
Controlled Trials ◽  
Non Invasive ◽  
Randomized Controlled ◽  
Stimulation Technique

BACKGROUND Urinary tract infection (UTI) is one of common illness in newborn and infants. An accurate urine sample to diagnosis of UTI is crucial to ensure appropriate treatment to avoid delayed and false-treatment. However, data to assess the effectiveness and safety of non-invasive stimulation technique of collecting urine in newborn and infants are yet to be critically evaluated. OBJECTIVE This protocol aimed to conduct a systematic review and meta-analysis to evaluate the evidences related to the effectiveness and safety of non-invasive stimulation technique of collecting urine in newborn and infants. METHODS This protocol follows guideline according to Preferred Reporting Items for Systematic reviews and Meta-Analysis Protocol and registered on the International Prospective Register of Systematic Reviews. Seven databases will be searched from their inception to March 2020: PubMed, EBSCO, Cochrane Central Register of Controlled Trials (CENTRAL), MEDLINE and cumulative index to nursing and allied health literature database. RESULTS This Systemic review will include randomized controlled clinical trials (RCTs) including quasi-randomized controlled trials (quasi-RCTs), observational studies (prospective cohort or retrospective cohort studies). We will perform data extraction, study selection, assessment with risk of bias and data analysis. Primary outcomes measure success in obtaining a urine sample. Secondary outcome measures included gender, age group, weight analysis, contamination rate and adverse effects. Study methodological appraisal of the studies will be assessed by the Cochrane Risk of Bias Tools. For sufficient data are available, a meta-analysis will be conducted. I2 statistics will be used to assess heterogeneity and identify potential sources. CONCLUSIONS This systematic review wills no requirement for ethical approval, without human beings involvement. This systematic review will be published electronically in a peer-reviewed journal, and will give healthcare practitioners good practical guide and information for the evidences related to the effectiveness of non-invasive stimulation techniques to collect urine in newborn and infants, aims to improve clinical outcomes.

scholarly journals Efficiency and contribution of strategies for finding randomized controlled trials: a case study from a systematic review on therapeutic interventions of chronic depression

2014 ◽  
Vol 3 (2) ◽  
Author(s):  
Annika Westphal ◽  
Levente Kriston ◽  
Lars P. Hölzel ◽  
Martin Härter ◽  
Alessa Von Wolff
Keyword(s):  
Systematic Review ◽  
Systematic Reviews ◽  
Search Strategy ◽  
Reference Lists ◽  
Search Strategies ◽  
Database Search ◽  
Controlled Trials ◽  
Electronic Database ◽  
Randomized Controlled ◽  
Electronic Database Search

<em>Background</em>. Identifying all existing evidence is a crucial aspect in conducting systematic reviews. Since the retrieval of electronic database searches alone is limited, guidelines recommend the use of addi- tional search strategies. The aim of this investigation was to assess the efficiency and contribution of additional search strategies for identifying randomized controlled trials in conducting a systematic review on interventions after performing a sensitive electronic database search. <br /><em>Design and Methods</em>. Seven electronic databases, 3 journals and 11 systematic reviews were searched. All first authors of the included studies were contacted; citation tracking and a search in clinical trial registers were performed. <em>A priori</em> defined evaluation criteria were calculated for each search strategy. <br /><em>Results</em>. A total of 358 full-text articles were identified; 50 studies were included in the systematic review, wherefrom 84.0% (42) were acquired by the sensitive electronic database search and 16.0% (8) through additional search strategies. Screening reference lists of related systematic reviews was the most beneficial additional search strategy, with an efficiency of 31.3% (5) and a contribution of 10.0% (5/50), whereas hand-searching and author contacts contributed two and one additional studies, respectively. Citation tracking and searching clinical trial registers did not lead to any further inclusion of primary studies. <br /><em>Conclusions</em>. Based on our findings, hand-searching contents of relevant journals and screening reference lists of related systematic reviews may be helpful additional strategies to identify an extensive body of evidence. In case of limited resources, a sensitive electronic database search may constitute an appropriate alternative for identifying relevant trials.

scholarly journals Effects of Oats (Avena sativa L.) on Inflammation: A Systematic Review and Meta-Analysis of Randomized Controlled Trials

2021 ◽  
Vol 8 ◽  
Author(s):  
Sun Jo Kim ◽  
Cheol Woon Jung ◽  
Nguyen Hoang Anh ◽  
Suk Won Kim ◽  
Seongoh Park ◽  
...  
Keyword(s):  
Systematic Review ◽  
Randomized Controlled Trials ◽  
Systematic Reviews ◽  
Inflammatory Markers ◽  
Meta Analysis ◽  
Random Effect Model ◽  
Risk Of Bias ◽  
Controlled Trials ◽  
Randomized Controlled ◽  
Anti Inflammatory

Background: Oat and its compounds have been found to have anti-inflammatory effects. Through this systematic review and meta-analysis, we aimed to determine an evidence-based link between oat consumption and inflammatory markers.Methods: The Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines were followed. By the end of April 2021, we included randomized controlled trials (RCTs) that investigated the anti-inflammatory effect of oat and oat-related products through screening PubMed, Embase, Web of Science, ClinicalTrial.gov, and CENTRAL. Meta-analysis was conducted with a random-effect model on the standardized mean difference (SMD) of the change scores of inflammatory markers, including C-reactive protein (CRP), tumor necrosis factor-α (TNF-α), interleukin-6 (IL-6), and interleukin-8 (IL-8). Subgroup analyses were conducted to stratify confounding variables. The risk of bias was evaluated using the Cochrane risk of bias tool and Grading of Recommendations, Assessment, Development and Evaluation (GRADE) was applied to report the quality of evidence. This study was registered in the International Prospective Register of Systematic Reviews (PROSPERO; CRD42021245844).Results: Systematic screening of five databases yielded 4,119 studies, of which 23 RCTs were finally selected. For the four systemic inflammatory markers analyzed, no significant alterations were found after oat consumption. However, oat intake was found to significantly decrease CRP levels in subjects with one or more health complications (SMD: −0.18; 95% CI: −0.36, 0.00; P = 0.05; I2 = 10%). Furthermore, IL-6 levels were significantly decreased in subjects with dyslipidemia (SMD = −0.34; 95% CI: −0.59, −0.10; P = 0.006; I2 = 0%). These beneficial effects might be attributed to the effects of avenanthramide and β-glucan.Conclusions: Overall evidence supporting the alleviation of inflammatory response by oat intake was poor, calling for future studies including a larger sample size to confirm the findings.

scholarly journals Adjuvant Transarterial Chemoembolization Following Curative-Intent Hepatectomy Versus Hepatectomy Alone for Hepatocellular Carcinoma: A Systematic Review and Meta-Analysis of Randomized Controlled Trials

Cancers ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 2984
Author(s):  
Stepan M. Esagian ◽  
Christos D. Kakos ◽  
Emmanouil Giorgakis ◽  
Lyle Burdine ◽  
J. Camilo Barreto ◽  
...  
Keyword(s):  
Hepatocellular Carcinoma ◽  
Systematic Review ◽  
Randomized Controlled Trials ◽  
Transarterial Chemoembolization ◽  
Meta Analysis ◽  
Risk Of Bias ◽  
Cochrane Library ◽  
Controlled Trials ◽  
Curative Intent ◽  
Randomized Controlled

The role of adjuvant transarterial chemoembolization (TACE) for patients with resectable hepatocellular carcinoma (HCC) undergoing hepatectomy is currently unclear. We performed a systematic review of the literature using the MEDLINE, Embase, and Cochrane Library databases. Random-effects meta-analysis was carried out to compare the overall survival (OS) and recurrence-free survival (RFS) of patients with resectable HCC undergoing hepatectomy followed by adjuvant TACE vs. hepatectomy alone in randomized controlled trials (RCTs). The risk of bias was assessed using the Risk of Bias 2.0 tool. Meta-regression analyses were performed to explore the effect of hepatitis B viral status, microvascular invasion, type of resection (anatomic vs. parenchymal-sparing), and tumor size on the outcomes. Ten eligible RCTs, reporting on 1216 patients in total, were identified. The combination of hepatectomy and adjuvant TACE was associated with superior OS (hazard ratio (HR): 0.66, 95% confidence interval (CI): 0.52 to 0.85; p < 0.001) and RFS (HR: 0.70, 95% CI: 0.56 to 0.88; p < 0.001) compared to hepatectomy alone. There were significant concerns regarding the risk of bias in most of the included studies. Overall, adjuvant TACE may be associated with an oncologic benefit in select HCC patients. However, the applicability of these findings may be limited to Eastern Asian populations, due to the geographically restricted sample. High-quality multinational RCTs, as well as predictive tools to optimize patient selection, are necessary before adjuvant TACE can be routinely implemented into standard practice. PROSPERO Registration ID: CRD42021245758.

scholarly journals Effects of Supervised Multimodal Exercise Interventions on Cancer-Related Fatigue: Systematic Review and Meta-Analysis of Randomized Controlled Trials

2015 ◽  
Vol 2015 ◽  
pp. 1-13 ◽  
Author(s):  
José Francisco Meneses-Echávez ◽  
Emilio González-Jiménez ◽  
Robinson Ramírez-Vélez
Keyword(s):  
Systematic Review ◽  
Resistance Training ◽  
Randomized Controlled Trials ◽  
Meta Analysis ◽  
Risk Of Bias ◽  
Controlled Trials ◽  
Exercise Interventions ◽  
Training Interventions ◽  
Randomized Controlled ◽  
Cancer Related Fatigue

Objective. Cancer-related fatigue (CRF) is the most common and devastating problem in cancer patients even after successful treatment. This study aimed to determine the effects of supervised multimodal exercise interventions on cancer-related fatigue through a systematic review and meta-analysis.Design. A systematic review was conducted to determine the effectiveness of multimodal exercise interventions on CRF. Databases of PubMed, CENTRAL, EMBASE, and OVID were searched between January and March 2014 to retrieve randomized controlled trials. Risk of bias was evaluated using the PEDro scale.Results. Nine studiesn=772were included in both systematic review and meta-analysis. Multimodal interventions including aerobic exercise, resistance training, and stretching improved CRF symptoms (SMD=-0.23; 95% CI: −0.37 to −0.09;P=0.001). These effects were also significant in patients undergoing chemotherapyP<0.0001. Nonsignificant differences were found for resistance training interventionsP=0.30. Slight evidence of publication bias was observedP=0.04. The studies had a low risk of bias (PEDro scale mean score of 6.4 (standard deviation (SD) ± 1.0)).Conclusion. Supervised multimodal exercise interventions including aerobic, resistance, and stretching exercises are effective in controlling CRF. These findings suggest that these exercise protocols should be included as a crucial part of the rehabilitation programs for cancer survivors and patients during anticancer treatments.

scholarly journals Therapies for Meibomian Gland Dysfunction: A Systematic Review and Meta-Analysis of Randomized Controlled Trials

2017 ◽  
Vol 11 (1) ◽  
pp. 346-354 ◽  
Author(s):  
Kannan Sridharan ◽  
Gowri Sivaramakrishnan
Keyword(s):  
Systematic Review ◽  
Randomized Controlled Trials ◽  
Meta Analysis ◽  
Meibomian Gland ◽  
Risk Of Bias ◽  
Present Review ◽  
Meibomian Gland Dysfunction ◽  
Controlled Trials ◽  
Schirmer’S Test ◽  
Randomized Controlled

Introduction: Meibomian Gland Dysfunction (MGD) is a common, often overlooked, chronic condition affecting eyes for which various therapies are being evaluated. Considering the absence of a systematic review and meta-analysis, the present review was carried out. Methods: An appropriate search strategy eligibility criteria were framed and electronic databases were scrutinized for appropriate literature. Randomized Controlled Trials (RCTs) enrolling patients diagnosed with MGD were included. Outcome measures were Tear Break Up Time (TBUT), Schirmer’s test, Meibomian Gland (MG) secretion score, MG plugging score, OSDI and SPEED. Cochrane’s tool was used to assess the risk of bias and Forest plot were generated either with fixed or random effects model, with Standardized Mean Difference (SMD). Results: TBUTs, Schirmer’s test and OSDI scores for systemic antimicrobials with placebo were 1.58 [1.33, 1.83], 2.93 [0.78, 5.09] and -3.58 [-4.28, -2.89] respectively. No quantitative synthesis was attempted for either mebiomian plugging or meibomian secretion scores and no significant changes were observed with any other outcome parameter. Conclusion: Only the systemic antimicrobials were found to improve the clinical features of meibomian gland dysfunction. Varying effects of different therapeutic agents (heat therapies, omega-3-fatty acids and castor oil) were identified for MGD but the risk of bias pertaining to randomization and allocation concealment was found to be associated with most of the current RCTs. More high quality evidence is required to confirm the findings of the present review.

scholarly journals β-Hydroxy-β-methylbutyrate and its impact on skeletal muscle mass and physical function in clinical practice: a systematic review and meta-analysis

2019 ◽  
Vol 109 (4) ◽  
pp. 1119-1132 ◽  
Author(s):  
Danielle E Bear ◽  
Anne Langan ◽  
Eirini Dimidi ◽  
Liesl Wandrag ◽  
Stephen D R Harridge ◽  
...  
Keyword(s):  
Systematic Review ◽  
Skeletal Muscle ◽  
Physical Function ◽  
Muscle Mass ◽  
Skeletal Muscle Mass ◽  
Meta Analysis ◽  
Risk Of Bias ◽  
Controlled Trials ◽  
Randomized Controlled ◽  
Clinical Conditions

ABSTRACT Background Loss of skeletal muscle mass and muscle weakness are common in a variety of clinical conditions with both wasting and weakness associated with an impairment of physical function. β-Hydroxy-β-methylbutyrate (HMB) is a nutrition supplement that has been shown to favorably influence muscle protein turnover and thus potentially plays a role in ameliorating skeletal muscle wasting and weakness. Objectives The aim of this study was to investigate the efficacy of HMB alone, or supplements containing HMB, on skeletal muscle mass and physical function in a variety of clinical conditions characterized by loss of skeletal muscle mass and weakness. Methods A systematic review and meta-analysis of randomized controlled trials reporting outcomes of muscle mass, strength, and physical function was performed. Two reviewers independently performed screening, data extraction, and risk-of-bias assessment. Outcome data were synthesized through meta-analysis with the use of a random-effects model and data presented as standardized mean differences (SMDs). Results Fifteen randomized controlled trials were included, involving 2137 patients. Meta-analysis revealed some evidence to support the effect of HMB alone, or supplements containing HMB, on increasing skeletal muscle mass (SMD = 0.25; 95% CI: –0.00, 0.50; z = 1.93; P = 0.05; I2 = 58%) and strong evidence to support improving muscle strength (SMD = 0.31; 95% CI: 0.12, 0.50; z = 3.25; P = 0.001; I2 = 0%). Effect sizes were small. No effect on bodyweight (SMD = 0.16; 95% CI: –0.08, 0.41; z = 1.34; P = 0.18; I2 = 67%) or any other outcome was found. No study was considered to have low risk of bias in all categories. Conclusion HMB, and supplements containing HMB, increased muscle mass and strength in a variety of clinical conditions, although the effect size was small. Given the bias associated with many of the included studies, further high-quality studies should be undertaken to enable interpretation and translation into clinical practice. The trial was registered on PROSPERO as CRD42017058517.

scholarly journals Calcium supplementation for improving bone density in lactating women: a systematic review and meta-analysis of randomized controlled trials

2020 ◽  
Vol 112 (1) ◽  
pp. 48-56
Author(s):  
Guoqi Cai ◽  
Jing Tian ◽  
Tania Winzenberg ◽  
Feitong Wu
Keyword(s):  
Systematic Review ◽  
Clinical Trials ◽  
Randomized Controlled Trials ◽  
Calcium Intake ◽  
Calcium Supplementation ◽  
Meta Analysis ◽  
Risk Of Bias ◽  
Controlled Trials ◽  
Lactating Women ◽  
Randomized Controlled

ABSTRACT Background Clinical trials evaluating the effect of calcium supplementation on bone loss in lactating women have been small, with inconsistent results. Objectives We aimed to determine the effect of calcium supplementation on bone mineral density (BMD) in lactating women. Methods An electronic search of databases was conducted from inception to January 2020. Two authors screened studies, extracted data, and assessed the risk of bias of eligible studies. Percentage change in BMD was pooled using random-effects models and reported as weighted mean differences (WMDs) with 95% CIs. Risk of bias was assessed using the Cochrane risk of bias tool. Results Five randomized controlled trials including 567 lactating women were included. All had a high risk of bias. Mean baseline calcium intake ranged from 562 to 1333 mg/d. Compared with control groups (placebo/no intervention), calcium supplementation (600/1000 mg/d) had no significant effect on BMD at the lumbar spine (WMD: 0.74%; 95% CI: −0.10%, 1.59%; I2 = 47%; 95% CI: 0%, 81%; n = 527 from 5 trials) or the forearm (WMD: 0.53%; 95% CI: −0.35%, 1.42%; I2 = 55%; 95% CI: 0%, 85%; n = 415 from 4 trials). BMD at other sites was assessed in single trials: calcium supplementation had a small to moderate effect on total-hip BMD (WMD: 3.3%; 95% CI: 1.5%, 5.1%) but no effect on total body or femoral neck BMD. Conclusions Overall, the meta-analysis indicates that calcium supplementation does not provide clinically important benefits for BMD in lactating women. However, there was adequate dietary intake before supplementation in some studies, and others did not measure baseline calcium intake. Advising lactating women to meet the current recommended calcium intakes (with supplementation if dietary intake is low) is warranted unless new high-certainty evidence to the contrary from robust clinical trials becomes available. More research needs to be done in larger samples of women from diverse ethnic and racial groups. This systematic review was registered at www.crd.york.ac.uk/prospero as CRD42015022092.

scholarly journals Systematic Reviews and Meta-Analysis of Preclinical Studies: Why Perform Them and How to Appraise Them Critically

2014 ◽  
Vol 34 (5) ◽  
pp. 737-742 ◽  
Author(s):  
Emily S Sena ◽  
Gillian L Currie ◽  
Sarah K McCann ◽  
Malcolm R Macleod ◽  
David W Howells
Keyword(s):  
Systematic Review ◽  
Empirical Evidence ◽  
Systematic Reviews ◽  
Meta Analysis ◽  
Cerebrovascular Diseases ◽  
Preclinical Studies ◽  
Preclinical Research ◽  
Randomized Controlled ◽  
Methodological Rigor ◽  
Research Domains

The use of systematic review and meta-analysis of preclinical studies has become more common, including those of studies describing the modeling of cerebrovascular diseases. Empirical evidence suggests that too many preclinical experiments lack methodological rigor, and this leads to inflated treatment effects. The aim of this review is to describe the concepts of systematic review and meta-analysis and consider how these tools may be used to provide empirical evidence to spur the field to improve the rigor of the conduct and reporting of preclinical research akin to their use in improving the conduct and reporting of randomized controlled trials in clinical research. As with other research domains, systematic reviews are subject to bias. Therefore, we have also suggested guidance for their conduct, reporting, and critical appraisal.

scholarly journals Effect of Oats and Oat-Fiber on Glycemic Control in Diabetes: A Systematic Review and Meta-Analysis of Randomized Controlled Trials

2021 ◽  
Vol 5 (Supplement_2) ◽  
pp. 489-489
Author(s):  
Victoria Chen ◽  
Andreea Zurbau ◽  
Amna Ahmed ◽  
Tauseef Khan ◽  
Cyril Kendall ◽  
...  
Keyword(s):  
Systematic Review ◽  
Type 2 Diabetes ◽  
Glycemic Control ◽  
Randomized Controlled Trials ◽  
Plasma Glucose ◽  
Meta Analysis ◽  
Risk Of Bias ◽  
Controlled Trials ◽  
Randomized Controlled

Abstract Objectives Current approved health claims in Canada, US and Europe recognize the ability of oat ß-glucan to lower blood cholesterol; however, its ability to improve glycemic control is less certain. We undertook a systematic review and meta-analysis of randomized controlled trials to update the evidence of the effect of oats and oat-fiber on markers of glycemic control in people with and without diabetes. Here we present data for the subgroup with diabetes. Methods MEDLINE, EMBASE and the Cochrane Central Register of Controlled Trials were searched through September 23rd, 2020. We included randomized controlled trials of ≥ 2-weeks of sources of oat ß-glucan and measures of glycemic control in diabetes. Two independent reviewers extracted relevant data and assessed the risk of bias (Cochrane Risk of Bias 2.0 Tool). The outcomes were fasting plasma glucose (FPG), 2h-plasma glucose (2h-PG) from a 75 g-oral glucose tolerance test, HbA1c and fasting plasma insulin (FPI). Data were pooled using the generic inverse variance method. Heterogeneity was assessed (Cochran Q statistic) and quantified (I2 statistic). Pooled estimates were expressed as mean differences with 95% confidence intervals (CI). GRADE assessed the certainty of the evidence. Results Eligibility criteria were met by 5 trial comparisons (N = 359) in type 2 diabetes. No trials were identified in type 1 diabetes. Consumption of oat ß-glucan sources reduced FPG (MD = −0.37 mmol/L [95% CI: −0.70, −0.05 mmol/L], P = 0.03, I2 = 0.00%, PQ = 0.76) and 2h-PG (MD = −1.24 mmol/L [95% CI: −1.97, −0.51 mmol/L], P = 0.00, I2 = 0.00%, PQ = 0.56). There were non-significant reductions in HbA1c (MD = −0.12%, [95% CI: −0.26, 0.01%], P = 0.07, I2 = 0.00%, PQ = 1.00) and FPI (MD = −4.59 pmol/L, [95% CI: −14.71, 5.52 pmol/L], P = 0.37, I2 = 40.84%, PQ = 0.19). The certainty of evidence was high for 2h-PG and moderate for FPG, HbA1c and FPI (single downgrades for imprecision in each case). Conclusions Current evidence provides a good indication that consumption of oat ß-glucan results in small improvements of glycemic control in type 2 diabetes. More high quality randomized trials are required to improve the precision of the pooled estimates. (ClinicalTrials.gov identifier, NCT04631913) Funding Sources Quaker Oats Center of Excellence, Diabetes Canada, Banting & Best Diabetes Centre, Toronto 3D foundation

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