A metaanalysis of clinical studies conducted during the. Methods pubmed, cochrane central register of controlled trials, and. Objective to conduct a meta analysis evaluating clinical outcome after aneurysm treatment. Metaanalysis of the clinical efficacy and safety of high a. This book describes the planning, conduct and reporting of a meta analysis as applied to a series of randomized controlled clinical trials. We included chinese randomized control trials that included 1049 children.
Pdf the objectives of this paper are to provide an introduction to metaanalysis and to discuss the rationale for. Glass first defined metaanalysis in the social science literature as the statistical analysis of a large collection of analysis results from individual studies for the purpose of integrating the findings 9. The structure of study records in xml is defined by this xml schema. Metaanalysis is the quantitative analysis of the results included in an sr. To run the program on a mac, a windows emulator is necessary such as parallels or. These limitations notwithstanding, this first metaanalysis of randomised trials of social network interventions identified an important knowledge and practice gap in the care of patients with type 2 diabetes, and produced a theoretical model connecting social network interventions with outcomes in these and other patients living with chronic. Aggregated evidence for management of ruptured and unruptured aneurysms is missing.
It explains how to download study record data in extensible markup language xml, a machinereadable format, and in other data formats. Calculation of effect size between two means can be done by three measures. Metaanalysis of controlled clinical trials statistics in practice epdf. This is a pdf file of an unedited manuscript that has. Pdf metaanalysis of phase ii cooperative group trials in. Metaanalyses of the effect of important food sources of. Reaching cardiovascular prevention guideline targets with. Effect of probiotic supplementation in pregnant women. We evaluated the effect of mediterranean diets on body weight in randomized controlled trials rcts using a metaanalysis. Longterm clinical outcomes with provisional stenting ps compared with a twostent ts strategy for bifurcation lesions are scarce. Pdf methods for metaanalysis in medical research researchgate. Relationship between response rates and median progression.
Objective to assess the efficacy of vitamin and antioxidant supplements in the prevention of cardiovascular diseases. We performed a meta analysis of randomized, placebocontrolled trials to assess the effects of probiotic supplementation on atopic sensitization and asthmawheeze prevention in children. A total of 20 clinical trials with 10 singlearm trials and 10 doublearm trials were included in the final metaanalysis. Metaanalysis can be a helpful tool for generating hypotheses for future trials, for. Meta analysis is the quantitative analysis of the results included in an sr. Metaanalysis of trials provides a precise estimate of.
Vegetarian diets may promote weight loss, but evidence remains inconclusive. Jan 18, 20 objective to assess the efficacy of vitamin and antioxidant supplements in the prevention of cardiovascular diseases. Table 3 shows the results of the metaregression analysis of our main pairwise comparison pre and postantidepressant treatment. We aim to perform the first metaanalysis of randomised controlled trials rcts to explore longterm outcomes. Metaanalyses of the effect of important food sources of sugars on cardiometabolic risk factors the safety and scientific validity of this study is the responsibility of the study sponsor and investigators. To investigate the association between cholesterol lowering interventions and risk of death from suicide, accident, or trauma nonillness mortality. The median overall survival os, progression free survival pfs, overall response rate orr, disease control rate dcr, 1 year survival rate, and 2 year survival rate were 19. Most of the randomized clinical trials reported various approaches for evaluating adherence and causes of loss to followup. Metaanalysis of rcts of anticytokine drug vs placebo. This meta analysis uses data from randomized clinical trials of antidepressants to investigate the assumption of systematic variability in symptomatic response to antidepressants and assesses whether this variability is associated with severity of major depressive disorder, antidepressant class, or. Metaanalysis in clinical trials rebecca dersimonian and nan laird abstract. Metaanalysis in clinical trials 181 where 0i is the true treatment effect in the ith study, w is the mean effect for a population of possible treatment evaluations, and 8i is the deviation of the ith studys effect from the population mean. Metaanalysis is a quantitative, formal, epidemiological study design used to systematically assess previous research studies to derive conclusions about that body. This book describes the planning, conduct and reporting of a metaanalysis as applied to a series of randomized controlled clinical trials.
Glass, 1976, p3 metaanalysis techniques are needed because only. Linear regression analysis using logit of response rates and logarithm of median pfs indicated that the correlation between overall response rate orr and median pfs was higher r 2 0. Almost all of these were in social sciences with 50% in psychology, 32% in education research and 10% in business economics. For metaanalysis in clinical trials 1, we adopted this same.
Pubmed, embase and uptodate databases were searched through september 22, 2014, and investigators extracted data regarding study characteristics and assessed study quality among selected randomized clinical trials. To investigate the effect of garlic on total cholesterol level in persons with elevated levels by conducting a metaanalysis of randomized, doubleblind, placebocontrolled trials. Metaanalysis of the clinical efficacy and safety of high. Our metaanalysis of clinical trials showed that nut consumption was associated with a nonsignificant decrease in body weight of 0. The basic idea of the approach is the same, but here we assumed the treatment. Mar 23, 2016 meta analyses of the effect of important food sources of sugars on cardiometabolic risk factors the safety and scientific validity of this study is the responsibility of the study sponsor and investigators. An international conference of clinicians, clinical investigators and biostatisticians discussed metaanalysis in relation to clinical trials, i. The historical roots of meta analysis can be traced back to 17th century studies of astronomy, while a paper published in 1904 by the statistician karl pearson in the british medical journal which collated data from several studies of typhoid inoculation is seen as the first time a meta analytic approach was used to aggregate the outcomes of multiple clinical studies. Sutton and others published methods for meta analysis in. We discuss a random effects approach to combining evidence. Patients and methods a comprehensive meta analysis enrolling 16 firstline clinical trials was performed to evaluate the efficacy of chemotherapy alone and chemotherapy plus targeted therapies for patients with mcrc with right primary tumour site, and we validated the results in metastatic setting 14 trials containing 4306 patients with.
Following the introduction of the term meta analysis in 1976 and before the publication of our article, meta analysis in clinical trials, in 1986, web of science lists 222 articles with the term meta analysis in the title. Highquality plant protein sources legumes, soy, nuts, and other plant protein sources resulted in more favorable changes in total and lowdensity lipoprotein cholesterol in comparison with red meat intake in the first metaanalysis of randomized controlled trials examining the effects of red meat on changes in cardiovascular disease risk factors stratified. Clinical outcome after surgical clipping or endovascular. During fatal disease outbreaks, randomization may be difficult to conduct due to ethical concerns and challenging field conditions. Analysis of controlled clinical trials wiley online. The main evaluated maternal outcomes were proportion of patients. Patients and methods a comprehensive metaanalysis enrolling 16 firstline clinical trials was performed to evaluate the efficacy of chemotherapy alone and chemotherapy plus targeted therapies for patients with mcrc with right primary tumour site, and we validated the results in metastatic setting 14 trials containing 4306 patients with. Efficacy of vitamin and antioxidant supplements in. However, it is often appropriate to take a broader perspective in a metaanalysis than in a single clinical trial. The epidemiological evidence supporting a causal link between mediterranean diets and body weight is contrasting. The free trial installation will install a copy of the program and a pdf copy of the manual.
We performed a metaanalysis of randomized, placebocontrolled trials to assess the effects of probiotic supplementation on atopic sensitization and. Over the last twenty years there has been a dramatic upsurge in the application of metaanalysis to medical research. Clinical trials of rosiglitazone in the meta analysis. Volatile anesthetics versus propofol for cardiac surgery. Methods we conducted an individual participant data meta analysis of three randomised clinical trials that compared a strategy using a polypill containing aspirin, statin and antihypertensive therapy with usual care in patients with a prior cardiovascular disease cvd event or who were at high risk of their first event. Design meta analysis of randomised controlled trials. Background the optimal interventional technique for addressing coronary bifurcation lesions is debatable.
The role of maintenance strategies in metastatic colorectal. The hardest part for individual data analyses is combining data together especially for studies that completed long time ago and data might have been collected in different units and formats. Objectives high potassium intake could prevent stroke, but supplementation is considered hazardous. The major threats to the confidence in our estimates are the high, unexplained heterogeneity between all five included trials i 2 55% and the imprecision of the pooled estimate the confidence interval for the. This metaanalysis uses data from randomized clinical trials of antidepressants to investigate the assumption of systematic variability in symptomatic response to antidepressants and assesses whether this variability is associated with severity of major depressive disorder, antidepressant class, or. Blinding is difficult in dietary interventions, and only two trials,15 adopted a blind study design. We searched english and nonenglish publications in pubmed, embase, scopus, and the cochrane. Metaanalysis of the nonillness mortality outcomes of large, randomised clinical trials of cholesterol lowering treatments. The evidence suggests that extracorporeal shock wave therapy is not beneficial in the treatment of tennis.
Table 1 lists the 42 trials included in this metaanalysis. Meta analysis in clinical trials 181 where 0i is the true treatment effect in the ith study, w is the mean effect for a population of possible treatment evaluations, and 8i is the deviation of the ith studys effect from the population mean. Seventy six randomised controlled trials were identified, 28 of which satisfied the minimum criteria for metaanalysis. Therefore, we categorized the studies based on jadad score24 as either high quality n 5, score. It is a better indicator of extraneous variance than. Effect of rosiglitazone on the risk of myocardial infarction. Clinical trials of rosiglitazone in the metaanalysis. This has mainly been due to greater emphasis on evidencebased medicine and the need for reliable summaries of the vast and expanding volume of clinical research. Jun 19, 2014 effect of modest salt reduction on blood pressure. Guideline for the management of nonmuscle invasive bladder cancer stages ta, t1, and tis. The various approaches are presented within a general unified framework. Two trials dlcst and lusi, accounting for around 22% of the lung cancers included in the meta analysis, were at low risk of bias.
Volatile anesthetics versus propofol for cardiac surgery with. Although the magnitude of these effects was modest, the results allay the fear that nut consumption may promote obesity. Probiotic administration in early life, atopy, and asthma. A total of 23 reports, corresponding to 17 clinical inves. Randomized clinical trials on the effects of current. Methods we conducted an individual participant data metaanalysis of three randomised clinical trials that compared a strategy using a polypill containing aspirin, statin and antihypertensive therapy with usual care in patients with a prior cardiovascular disease cvd event or who were at high risk of their first event. For metaanalysis in clinical trials, we adopted this same randomeffects approach to integrate the findings from a number of related clinical trials to strengthen the evidence for the efficacy of a certain treatment for a specified medical condition. Highquality plant protein sources legumes, soy, nuts, and other plant protein sources resulted in more favorable changes in total and lowdensity lipoprotein cholesterol in comparison with red meat intake in the first meta analysis of randomized controlled trials examining the effects of red meat on changes in cardiovascular disease risk factors stratified by the specific food. Access or download the clinical trials transformation initiative cttis database for aggregate analysis of clinicaltrials.
Table 1 lists the 42 trials included in this meta analysis. Design metaanalysis of randomised controlled trials. Meta analysis of phase ii cooperative group trials in metastatic stage iv melanoma to determine progression free and overall survival benchmarks for future phase ii trials. Metaanalysis of seven randomised, doubleblind, placebocontrolled trials, 20, 26, 27, 35, 45, 46, 47. We assessed the effect of oral potassium supplementation on serum or plasma potassium levels and renal function. Pdf metaanalysis of randomised clinical trials comparing.
Metaanalysis of randomized controlled trials of red meat. Pdf metaanalysis of phase ii cooperative group trials. Metaanalysis is most often used to assess the clinical. Reaching cardiovascular prevention guideline targets with a. Here, we used a meta analysis method to collect data from randomized control trials of different doses of methylprednisolone in smpp to assess the safety and efficacy of treatment with low versus highdose methylprednisolone in children with smpp. In practice, this implies the combination of the results of several individual clinical trials using specialized statistical methodology. Analysis of controlled clinical trials wiley online books. Systematic literature searches were conducted on the medline, embase, biosis, cochrane library, amed, and ciscom databases.
The historical roots of metaanalysis can be traced back to 17th century studies of astronomy, while a paper published in 1904 by the statistician karl pearson in the british medical journal which collated data from several studies of typhoid inoculation is seen as the first time a metaanalytic approach was used to aggregate the outcomes of multiple clinical studies. Meta analysis of randomized clinical trials is not an infallible tool, however, and several examples exist of meta analyses which were later contradicted by single large randomized controlled trials, and of meta analyses addressing the same issue which have reached opposite conclusions 72. Metaanalysis of controlled clinical trials statistics in practice. We screened 116 phase 2, 3, and 4 trials for inclusion. Application of metaanalysis in clinical trials, continued 2 1 each study effect size the first step in metaanalysis calculation is to get the effect size estimation for each study. A total of 20 clinical trials with 10 singlearm trials and 10 doublearm trials were included in the final meta analysis. What is a metaanalysis in 1976, glass coined the term metaanalysis metaanalysis refers to the analysis of analyses the statistical analysis of a large collection of analysis results from individual studies for the purpose of integrating the findings. Conclusive evidence from clinical studies about treatment efficacy requires an appropriate control group, usually requiring randomization to balance out factors. We aim to perform the first meta analysis of randomised controlled trials rcts to explore longterm outcomes comparing both strategies. These limitations notwithstanding, this first meta analysis of randomised trials of social network interventions identified an important knowledge and practice gap in the care of patients with type 2 diabetes, and produced a theoretical model connecting social network interventions with outcomes in these and other patients living with chronic. Chemotherapy plus bevacizumab as an optimal firstline. Objective to conduct a metaanalysis evaluating clinical outcome after aneurysm treatment.
Probiotics may reduce the risk of atopy and asthma in children. The median overall survival os, progressionfree survival pfs, overall response rate orr, disease control rate dcr, 1 year survival rate, and 2 year survival rate were 19. Background two randomized trials have evaluated clipping and coiling in patients with ruptured aneurysms. Table 3 shows the results of the meta regression analysis of our main pairwise comparison pre and postantidepressant treatment. Two trials dlcst and lusi, accounting for around 22% of the lung cancers included in the metaanalysis, were at low risk of bias. Metaanalysis is a quantitative, formal, epidemiological study design used to systematically assess the results of previous research to. Dietary intervention in patients with gestational diabetes. At the same time there have been great strides in the development and refinement of the associated statistical methodology. However, results from clinical trials have been conflicting, and several of them may have been underpowered. For its metaanalysis of suicidality data from the adult clinical trials, the fda asked companies to submit data only from short term depression studies up to 17 weeks, which had at least 30 patients in the study. Meta analysis of the nonillness mortality outcomes of large, randomised clinical trials of cholesterol lowering treatments. Methods pubmed, cochrane central register of controlled trials, and clinicaltrials.
Metaanalysis should be conducted when a group of studies is sufficiently homogeneous in terms of subjects involved, interventions, and outcomes to provide a meaningful summary. The evaluation is the professional version of the program. Data sources and study selection pubmed, embase, the cochrane library, scopus, cinahl, and clinicaltrials. Overdiagnosis of lung cancer with lowdose computed. Metaanalysis of phase ii cooperative group trials in metastatic stage iv melanoma to determine progressionfree and overall survival benchmarks for future phase ii trials. Our meta analysis of clinical trials showed that nut consumption was associated with a nonsignificant decrease in body weight of 0. Individual differences in response to antidepressants. Longterm outcomes of provisional stenting compared. Garlic for treating hypercholesterolemiaa metaanalysis of. Such analyses are essentially observational, using trials as the unit of enrollment rather than individual patients. Jan 20, 2011 we evaluated the effect of mediterranean diets on body weight in randomized controlled trials rcts using a meta analysis.
Explanatory variables such as gender, baseline depression, casecontrol vs. The evaluation runs for 10 days or 10 trials, whichever comes first. Gsks may 2006 analysis of paxil clinical trials confirms risk in adults. We searched english and nonenglish publications in pubmed, embase, scopus, and the cochrane central register of controlled trials from inception to january, 2010. Here, we used a metaanalysis method to collect data from randomized control trials of different doses of methylprednisolone in smpp to assess the safety and efficacy of treatment with low versus highdose methylprednisolone in children with smpp. Cohens d, hedges g, and glass delta using formulas below. Cancers free fulltext efficacy of crizotinib, ceritinib.
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