Hostname: page-component-7b7567c8c-7pwfn Total loading time: 0 Render date: 2026-11-14T03:53:01.255Z Has data issue: false hasContentIssue false

Causal Inference for Meta-Analysis and Multi-Level Data Structures, with Application to Randomized Studies of Vioxx

Published online by Cambridge University Press:  01 January 2025

Michael Sobel*
Affiliation:
Columbia University
David Madigan
Affiliation:
Columbia University
Wei Wang
Affiliation:
Philips Research North America
*
Correspondence should be made to Michael Sobel, Department of Statistics, Columbia University, New York, NY, USA. Email: michael@stat.columbia.edu

Abstract

We construct a framework for meta-analysis and other multi-level data structures that codifies the sources of heterogeneity between studies or settings in treatment effects and examines their implications for analyses. The key idea is to consider, for each of the treatments under investigation, the subject’s potential outcome in each study or setting were he to receive that treatment. We consider four sources of heterogeneity: (1) response inconsistency, whereby a subject’s response to a given treatment would vary across different studies or settings, (2) the grouping of nonequivalent treatments, where two or more treatments are grouped and treated as a single treatment under the incorrect assumption that a subject’s responses to the different treatments would be identical, (3) nonignorable treatment assignment, and (4) response-related variability in the composition of subjects in different studies or settings. We then examine how these sources affect heterogeneity/homogeneity of conditional and unconditional treatment effects. To illustrate the utility of our approach, we re-analyze individual participant data from 29 randomized placebo-controlled studies on the cardiovascular risk of Vioxx, a Cox-2 selective nonsteroidal anti-inflammatory drug approved by the FDA in 1999 for the management of pain and withdrawn from the market in 2004.

Information

Type
Original Paper
Copyright
Copyright © 2016 The Psychometric Society

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Article purchase

Temporarily unavailable

Supplementary material: File

Sobel et al. supplementary material

Sobel et al. supplementary material
Download Sobel et al. supplementary material(File)
File 2 KB