Subgrouping Is Really Hard: Evaluating Statistical Support in RCTs (ptpodcast.com)

• Subgroup analyses in RCTs are methodologically challenging.
• Wallach et al. found insufficient statistical support for many subgroup claims.
• Retrospective subgroup identification is problematic.
• The episode emphasizes prospective validation and replication.

"This PT Inquest podcast episode discusses the difficulty of defining subgroups in randomized controlled trials, referencing Wallach et al. (JAMA Intern Med, 2017) which evaluated statistical support for subgroup claims. The episode questions whether retrospective analysis of treatment responders is sufficient or if more rigorous methods are needed."