Statistical approaches to harmonize data on cognitive measures in systematic reviews are rarely reported.

ABSTRACT:

Objectives

To identify statistical methods for harmonization, the procedures aimed at achieving the comparability of previously collected data, which could be used in the context of summary data and individual participant data meta-analysis of cognitive measures.

Study design and setting

Environmental scan methods were used to conduct two reviews to identify (1) studies that quantitatively combined data on cognition and (2) general literature on statistical methods for data harmonization. Search results were rapidly screened to identify articles of relevance.

Results

All 33 meta-analyses combining cognition measures either restricted their analyses to a subset of studies using a common measure or combined standardized effect sizes across studies; none reported their h

SUBMITTER: Griffith LE 

PROVIDER: S-EPMC4685455 | biostudies-literature | 2015 Feb

REPOSITORIES: biostudies-literature