Episode Details

In this episode, Jullia and Tom discuss direct and indirect pathways in observational studies, with a focus on mediation analysis and what it can, and cannot, show. Using an ankylosing spondylitis example, they look at how fatigue, anxiety/depression, and work productivity loss can be mapped as exposure, mediator, and outcome, and why interpretation needs care when the data are observational.

Key Takeaways

• Direct and indirect pathways in this context refer to mediation analysis, not basal ganglia movement-control circuits.
• Mediation analysis can help examine whether an observed relationship may operate through an intermediate variable, but it does not prove causality on its own.
• The practical value of pathway analysis depends on clear hypotheses, suitable variable measurement, uncertainty assessment, and careful interpretation.

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