Interpreting the Tinnitus Questionnaire (German version): what individual differences are clinically important?

Area of Science:

• Audiology
• Clinical Psychology
• Psychometrics

Background:

• Clinical significance reporting is vital as statistical significance does not always equate to patient relevance.
• The Tinnitus Questionnaire (TQ) is often interpreted using a 5-point change as a minimal clinically important difference (MCID).
• The original determination of the 5-point MCID for the TQ has known limitations.

Purpose of the Study:

• To re-evaluate the minimal clinically important difference (MCID) for the German Tinnitus Questionnaire (TQ).
• To provide a more reliable measure for assessing clinically meaningful changes in tinnitus severity.

Main Methods:

• Retrospective analysis of clinical data from 202 patients undergoing tinnitus interventions.
• Computation of multiple MCID estimates using anchor- and distribution-based methods.
• Inclusion of patient-reported improvement and measurement reliability in the analysis.

Main Results:

• Six MCID estimates for the TQ ranged from 5 to 21 points.
• The previously used 5-point MCID was derived from a method ignoring measurement error and bias.
• Significant measurement error complicates the interpretation of individual patient changes based on the 5-point threshold.

Conclusions:

• The 5-point MCID for the TQ is not sufficiently reliable for clinical interpretation.
• A higher MCID threshold is necessary to ensure confidence in clinically meaningful patient improvement.
• A median MCID of 12 points is recommended for the TQ to enhance the interpretation of individual patient outcomes.