What does it mean to ‘control’ for variables in a scientific study? A statistician explains

Understanding what a ‘control’ is can help you decide for yourself how insightful new studies are.

By: Mark Louie Ramos, Penn State, The Conversation

Outlets: The Conversation

Published: September 25, 2026

Words: 1,251

Last Updated: 3 weeks, 2 days ago

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By Mark Louie Ramos, Penn State

Scientific studies, and news coverage about them, often declare that a study “controlled” for certain variables.

For example, the Washington Post reported on a study of GLP-1 drugs and a hormonal disorder. The article noted that “women on GLP-1s lost more weight than those in control groups.”

A couple months earlier, the Post reported on a different study about GLP-1s and bone and tendon injuries. It said …

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