26 Putting It All Together: Using Meta-Analysis in Psychiatric Research

2012 ◽  
pp. 333-348
Author(s):  
David L. Streiner
Keyword(s):  
Meta Analysis ◽  
Psychiatric Research

Evidence-based approaches to psychiatry

2017 ◽  
pp. 119-134
Author(s):  
Paul Harrison ◽  
Philip Cowen ◽  
Tom Burns ◽  
Mina Fazel
Keyword(s):  
Patient Experience ◽  
Meta Analysis ◽  
Psychiatric Research ◽  
Evidence Based ◽  
High Quality ◽  
Qualitative Methodologies ◽  
Meta Analyses ◽  
Based Medicine ◽  
Quality Evidence

‘Evidence-based approaches to psychiatry’ describes the application of evidence-based medicine (EBM) to psychiatric practice. The chapter covers the key processes in EBM, including the formulation of a clinically relevant question, the systematic search for high-quality evidence and the meta-analytic synthesis of data. It demonstrates how evidence-based approaches to psychiatry have led to important developments showing quantitative effects of different treatments through advanced meta-analysis of data from randomized trials. This has underpinned the development of clinical guidelines that have the aim of improving the reliability and quality of treatments that patients receive. The chapter also describes how meta-analyses should be critically reviewed, as well as their problems and limitations. Not all relevant questions in psychiatric research are susceptible to the quantitative approach offered by EBM, and the chapter also outlines how qualitative methodologies can play a key role in answering important questions related, for example, to the patient experience.

scholarly journals Meta-analysis of DSM alcohol use disorder criteria severities: structural consistency is only ‘skin deep’

2016 ◽  
Vol 46 (8) ◽  
pp. 1769-1784 ◽  
Author(s):  
S. P. Lane ◽  
D. Steinley ◽  
K. J. Sher
Keyword(s):  
Alcohol Use ◽  
Alcohol Use Disorder ◽  
Generalizability Theory ◽  
Meta Analysis ◽  
Data Entry ◽  
Study Data ◽  
Psychiatric Research ◽  
Sample Type ◽  
Structural Consistency ◽  
Individual Criterion

BackgroundItem response theory (IRT) analyses of alcohol use disorder (AUD) and other psychological disorders are a predominant method for assessing overall and individual criterion severity for psychiatric diagnosis. However, no investigation has established the consistency of the relative criteria severities across different samples.MethodPubMed/Medline, PsycINFO, Web of Science and ProQuest databases were queried for entries relating to alcohol use and IRT. Study data were extracted using a standardized data entry sheet. Consistency of reported criteria severities across studies was analysed using generalizability theory to estimate generalized intraclass correlations (ICCs).ResultsA total of 451 citations were screened and 34 papers (30 unique samples) included in the research synthesis. The AUD criteria set exhibited low consistency in the ordering of criteria using both traditional [ICC = 0.16, 95% confidence interval (CI) 0.06–0.56] and generalized (ICC = 0.18, 95% CI 0.15–0.21) approaches. These results were partially accounted for by previously studied factors such as age and type of sample (e.g. clinical v. community), but the largest source of unreliability was the diagnostic instrument employed.ConclusionsDespite the robust finding of unidimensional structure of AUDs, inconsistency in the relative severities across studies suggests low replicability, challenging the generalizability of findings from any given study. Explicit modeling of well-studied factors like age and sample type is essential and increases the generalizability of findings. Moreover, while the development of structured diagnostic interviews is considered a landmark contribution toward improving psychiatric research, variability across instruments has not been fully appreciated and is substantial.

scholarly journals Gut feeling: randomized controlled trials of probiotics for the treatment of clinical depression: Systematic review and meta-analysis

2019 ◽  
Vol 9 ◽  
pp. 204512531985996 ◽  
Author(s):  
Viktoriya Nikolova ◽  
Syed Yawar Zaidi ◽  
Allan H. Young ◽  
Anthony J. Cleare ◽  
James M. Stone
Keyword(s):  
Depressive Symptoms ◽  
Randomized Controlled Trials ◽  
Treatment Effectiveness ◽  
Meta Analysis ◽  
Population Characteristics ◽  
Psychiatric Research ◽  
Controlled Trials ◽  
Science Data ◽  
Randomized Controlled ◽  
Published Evidence

Background: Recently the gut microbiota has attracted significant interest in psychiatric research due to the observed bidirectional gut–brain communication. A growing body of evidence from preclinical work has suggested that probiotics may be effective in reducing stress and anxiety and alleviating low mood. It is unclear to what extent these effects are seen in clinical populations. We aimed to identify all published evidence on the efficacy of probiotics as treatment for depression in clinically depressed populations. Methods: Randomized controlled trials of patients with depression where probiotics were used as supplementary or standalone treatment were considered eligible. A literature search with the terms ( probiotic* OR bacteria OR Lactobacillus OR Bifidobacterium) AND depress* was performed in PubMed and Web of Science. Data on study population characteristics, treatment effectiveness, tolerability and risk of bias were extracted from eligible studies. A random effects model was used for meta-analyses. Results: Only three studies met inclusion criteria (229 individuals randomized), two of which administered probiotics as a supplementary treatment to antidepressants and one as a standalone treatment. Upon removal of the latter study from the meta-analysis due to clinical heterogeneity, there was an overall positive effect of probiotics on depressive symptoms (standardized mean difference = 1.371, 95% confidence interval 0.130–2.613). Conclusions: There is limited evidence for the efficacy of probiotics in depression at present, although there may be a beneficial effect of probiotics on depressive symptoms when administered in addition to antidepressants. Further studies are required to investigate this and explore potential mechanisms.

scholarly journals The correlation between central and peripheral oxytocin concentrations: a systematic review and meta-analysis

2016 ◽  
Author(s):  
Mathias Valstad ◽  
Gail A. Alvares ◽  
Maiken Egknud ◽  
Anna Maria Matziorinis ◽  
Ole A. Andreassen ◽  
...  
Keyword(s):  
Meta Analysis ◽  
Methodological Approach ◽  
Fluid Collection ◽  
Positive Association ◽  
Total Sample ◽  
Psychiatric Research ◽  
Baseline Conditions ◽  
High Level ◽  
And Behavior

AbstractThere is growing interest in the role of the oxytocin system in social cognition and behavior. Peripheral oxytocin concentrations are regularly used to approximate central concentrations in psychiatric research. This methodological approach has obvious appeal given the invasiveness of cerebrospinal fluid collection. However, the validity of this approach and potential moderators of the association between central and peripheral levels are unclear. Thus, we conducted a pre-registered systematic search and meta-analysis of correlations between central and peripheral oxytocin concentrations. A search of databases yielded 17 eligible studies for effect size synthesis and moderator analysis, resulting in a total sample size of 516 participants and subjects. Overall, a positive association between central and peripheral oxytocin concentrations was revealed [r=0.29, 95% CI (0.15, 0.42), p<0.0001], along with a moderate-to-high level of heterogeneity across effect sizes [Q=88.14, p<0.0001], and no evidence of publication bias (p=0.45). This association was significantly moderated by experimental context [Qb(4), p=0.0016]. The strongest association was observed after intranasal oxytocin administration (r=0.67, p<.0001), a correlation that was significantly greater (p=.0002) than the equivalent association under baseline conditions (r=0.08, p=.31). These results support the use of peripheral levels of oxytocin as a marker of central levels, but only after exogenous oxytocin administration. Despite the popularity of using peripheral OT levels to approximate central levels during baseline conditions, this approach is not supported by the present results.

The effects of low-ratio n-6/n-3 PUFA on biomarkers of inflammation: a systematic review and meta-analysis

2021 ◽  
Author(s):  
Yali Wei ◽  
Yan Meng ◽  
Na Li ◽  
Qian Wang ◽  
Liyong Chen
Keyword(s):  
Systematic Review ◽  
Fatty Acid ◽  
Polyunsaturated Fatty Acid ◽  
Meta Analysis ◽  
Chain Polyunsaturated Fatty Acid ◽  
Inflammation Markers ◽  
Pufa Supplementation ◽  
Long Chain

The purpose of the systematic review and meta-analysis was to determine if low-ratio n-6/n-3 long-chain polyunsaturated fatty acid (PUFA) supplementation affects serum inflammation markers based on current studies.

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