Minimal Detectable Change
Also written as: MDC — Minimal Detectable Change
The smallest change in score that can be detected by an outcome measure beyond measurement error.
Full Definition
Minimal Detectable Change (MDC) is a statistical measure that represents the smallest change in an outcome measure score that can be considered real change beyond measurement error and variability. MDC values are specific to each outcome measure and help clinicians determine whether observed changes in patient scores represent true improvement or decline rather than normal fluctuation or measurement error. Understanding MDC is crucial for interpreting outcome measure results and making evidence-based decisions about treatment effectiveness and discharge planning.
Usage
Usage note: Often confused with MCID; MDC focuses on measurement error while MCID addresses clinical significance.
In Context
- "The patient's 8-point improvement on the Oswestry Disability Index exceeded the minimal detectable change of 6 points." — Progress report
- "Changes below the MDC threshold may not represent true clinical improvement beyond measurement error." — Outcome interpretation