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- W4299979530 abstract "Objective: We investigated the associations between risk of bias judgments from Cochrane reviews for sequence generation, allocation concealment and blinding and between-trial heterogeneity. Study Design and Setting: Bayesian hierarchical models were fitted to binary data from 117 meta-analyses, to estimate the ratio {lambda} by which heterogeneity changes for trials at high/unclear risk of bias, compared to trials at low risk of bias. We estimated the proportion of between-trial heterogeneity in each meta-analysis that could be explained by the bias associated with specific design characteristics. Results: Univariable analyses showed that heterogeneity variances were, on average, increased among trials at high/unclear risk of bias for sequence generation ({lambda} 1.14, 95% interval: 0.57 to 2.30) and blinding ({lambda} 1.74, 95% interval: 0.85 to 3.47). Trials at high/unclear risk of bias for allocation concealment were on average less heterogeneous ({lambda} 0.75, 95% interval: 0.35 to 1.61). Multivariable analyses showed that a median of 37% (95% interval: 0% to 71%) heterogeneity variance could be explained by trials at high/unclear risk of bias for sequence generation, allocation concealment and/or blinding. All 95% intervals for changes in heterogeneity were wide and included the null of no difference. Conclusion: Our interpretation of the results is limited by imprecise estimates. There is some indication that between-trial heterogeneity could be partially explained by reported design characteristics, and hence adjustment for bias could potentially improve accuracy of meta-analysis results." @default.
- W4299979530 created "2022-10-03" @default.
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- W4299979530 date "2017-04-21" @default.
- W4299979530 modified "2023-09-30" @default.
- W4299979530 title "Between-trial heterogeneity in meta-analyses may be partially explained by reported design characteristics" @default.
- W4299979530 doi "https://doi.org/10.48550/arxiv.1704.06491" @default.
- W4299979530 hasPublicationYear "2017" @default.
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