首页 | 本学科首页   官方微博 | 高级检索  
     


Meta-analysis on continuous outcomes in minimal important difference units: an application with appropriate variance calculations
Affiliation:1. Regional Neuromuscular Clinic, Queen Elizabeth Neurosciences Centre, University Hospitals of Birmingham, Birmingham, United Kingdom;2. Department of Neuropsychiatry, BSMHFT, Birmingham, United Kingdom;3. School of Life and Health Sciences, Aston University, Birmingham, United Kingdom;4. University of Birmingham, Birmingham, United Kingdom
Abstract:ObjectiveTo compare results from meta-analyses for mean differences in minimal important difference (MID) units (MDMID), when MID is treated as a random variable vs. a constant.Study Design and SettingMeta-analyses of published data. We calculated the variance of MDMID as a random variable using the delta method and as a constant. We assessed performance under different assumptions. We compare meta-analysis results from data originally used to present the MDMID and data from osteoarthritis studies using different domain instruments.ResultsDepending on the data set and depending on the values of rho and coefficient of variation of the MID (CoVMID), estimates of treatment effect and P-values between an approach considering the MID as a constant vs. as a random variable may differ appreciably. Using our data sets, we provide examples of the potential magnitude. When rho = 0.5 and CoVMID = 0.8, considering MID as a constant overestimated the treatment effect by 33–110% and decreased the P-value for heterogeneity from above 0.95 to below 0.08. When rho = 0.8 and CoVMID = 0.5, the magnitude of the effects was similar.ConclusionsConsidering MID as a random variable avoids unrealistic assumptions and provides more appropriate treatment effect estimates.
Keywords:Continuous outcomes  Meta-analysis  Minimal important difference  Standardized mean difference  Ratio of means  Variance  Methods
本文献已被 ScienceDirect 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号