Search results for "meta-analyysi"
showing 10 items of 56 documents
Effect of Omega-3 Dosage on Cardiovascular Outcomes : An Updated Meta-Analysis and Meta-Regression of Interventional Trials
2021
Objectives:To quantify the effect of eicosapentaenoic (EPA) and docosahexaenoic (DHA) acids oncardiovascular disease (CVD) prevention and the effect of dosage. Methods:This study is designed as a random effects meta-analysis and meta-regression of ran-domized control trials with EPA/DHA supplementation. This is an update and expanded analysis ofa previously published meta-analysis which covers all randomized control trials with EPA/DHAinterventions and cardiovascular outcomes published before August 2019. The outcomes includedare myocardial infarction (MI), coronary heart disease (CHD) events, CVDevents (a composite ofMI, angina, stroke, heart failure, peripheral arterial disease, sudden de…
Fysioterapian vaikuttavuus ja merkityksellisyys aivoverenkiertohäiriötä ja multippeliskleroosia sairastaville kuntoutujille : järjestelmälliset kirja…
2022
Tutkimuksen tavoitteena oli selvittää fysioterapian vaikuttavuutta ja merkityksellisyyttä aivoverenkiertohäiriötä (AVH) ja multippeliskleroosia (MS) sairastavilla kuntoutujilla keskittyen erityisesti ICF:n suoritukset ja osallistuminen -osa-alueeseen. Vaikuttavuutta koskevat määrälliset kirjallisuuskatsaukset (vaihteluväli: AVH 1/2008–5/2017; MS 1/2007–1/2017) kohdistuivat satunnaistettuihin kontrolloituihin terapeuttisen harjoittelun tutkimuksiin (RCT) painottuen tasapainoon ja kävelyyn. Laadulliset kirjallisuuskatsaukset fysioterapian merkityksellisyydestä (1/2000–11/2017) kohdistuivat kuntoutujan kokemuksiin ja käsityksiin fysioterapiasta. Kahdeksassa osajulkaisussa oli yhteensä 182 RCT-…
Meta-analysis of the relationship between teachers’ self-efficacy and attitudes toward inclusive education
2022
This meta-study aims to examine the size of the relationship between teachers' self-efficacy and attitudes toward inclusive education of K-12 students with special educational needs and to identify potential moderators (publication, sample, and research procedure characteristics). We synthesized the research conducted from 1994 to 2018, and 41 studies were included. Bare-bones meta-analysis with random effect model revealed a sample size weighted correlation coefficient between teachers’ self-efficacy and attitudes as r¯ = 0.35 (CI = 0.31-0.39). The between-study variations were not associated with hypothesized publication and sample characteristics. However, the self-efficacy measurement m…
Using meta-analytic path analysis to test theoretical predictions in health behavior: An illustration based on meta-analyses of the theory of planned…
2016
Objective Synthesizing research on social cognitive theories applied to health behavior is an important step in the development of an evidence base of psychological factors as targets for effective behavioral interventions. However, few meta-analyses of research on social cognitive theories in health contexts have conducted simultaneous tests of theoretically-stipulated pattern effects using path analysis. We argue that conducting path analyses of meta-analytic effects among constructs from social cognitive theories is important to test nomological validity, account for mediation effects, and evaluate unique effects of theory constructs independent of past behavior. We illustrate our points…
Prioritizing covariates in the planning of future studies in the meta-analytic framework
2016
Science can be seen as a sequential process where each new study augments evidence to the existing knowledge. To have the best prospects to make an impact in this process, a new study should be designed optimally taking into account the previous studies and other prior information. We propose a formal approach for the covariate prioritization, i.e., the decision about the covariates to be measured in a new study. The decision criteria can be based on conditional power, change of the p-value, change in lower confidence limit, Kullback-Leibler divergence, Bayes factors, Bayesian false discovery rate or difference between prior and posterior expectation. The criteria can be also used for decis…
Physical activity as a protective factor for dementia and Alzheimer’s disease: systematic review, meta-analysis and quality assessment of cohort and …
2022
ObjectivePhysical activity (PA) is associated with a decreased incidence of dementia, but much of the evidence comes from short follow-ups prone to reverse causation. This meta-analysis investigates the effect of study length on the association.DesignA systematic review and meta-analysis. Pooled effect sizes, dose–response analysis and funnel plots were used to synthesise the results.Data sourcesCINAHL (last search 19 October 2021), PsycInfo, Scopus, PubMed, Web of Science (21 October 2021) and SPORTDiscus (26 October 2021).Eligibility criteriaStudies of adults with a prospective follow-up of at least 1 year, a valid cognitive measure or cohort in mid-life at baseline and an estimate of the…
Dementia in former amateur and professional contact sports participants : population-based cohort study, systematic review, and meta-analysis
2023
Background Although there is growing evidence that former professional athletes from sports characterised by repetitive head impact subsequently experience an elevated risk of dementia, the occurrence of this disorder in retired amateurs, who represent a larger population, is uncertain. The present meta-analysis integrates new results from individual-participant analyses of a cohort study of former amateur contact sports participants into a systematic review of existing studies of retired professionals and amateurs. Methods The cohort study comprised 2005 male retired amateur athletes who had competed internationally for Finland (1920–1965) and a general population comparison group of 1386 …
Etäteknologian vaikuttavuus liikunnallisessa kuntoutuksessa : järjestelmällinen kirjallisuuskatsaus ja meta-analyysi
2017
Online grocery shopping before and during the COVID-19 pandemic: A meta-analytical review.
2021
The COVID-19 pandemic has forced people to limit their physical interactions, which has led to explosive growth in online grocery shopping. However, there is no clear consensus in the retailing literature on whether consumers prefer to buy groceries online. The objective of this current study is to synthesize research about online grocery shopping published before and during the COVID-19 pandemic and to develop a conceptual framework about online grocery purchase intentions and their determinants, the mediation effects of consumers’ attitudes, the moderating effects of COVID-19, and control variables. The meta-analysis presents data derived from 50 independent samples with a sample size of …
Meta-analyysin ja metaregression soveltaminen fyysistä aktiivisuutta mittaaviin tutkimuksiin
2017
Tieteellistä tietoa tuotetaan jatkuvasti lisää, mutta sen yhdistäminen aiempaan tietämykseen ei ole ongelmatonta. Tilastotieteellisesti tätä pulmaa lähestytään meta-analyysin ja metaregression avulla. Meta-analyysi on systemaattisessa kirjallisuuskatsauksessa kerätyn aineiston tilastollista yhteenvetoa; useista estimaateista luottamusväleineen muodostetaan yksi keskimääräinen estimaatti ja sen luottamusväli. Huomattavaa on, että meta-analyysin aineisto on eräänlainen aineistojen aineisto; havaintoyksiköitä eivät ole tutkimuksiin osallistuvat koehenkilöt vaan itse tutkimukset. Metaregressio on meta-analyysiä, jossa yhteenveto tehdään hyödyntämällä tutkimusten taustamuuttujia eli kovariaattej…