Patient-Determined Important Change for the Neck Disability Index With Application of Credibility Analysis: An...

Area of Science:

• Orthopedics
• Physical Therapy
• Rehabilitation Medicine

Background:

• Mechanical neck pain is a common condition impacting quality of life.
• Assessing patient-important change in neck pain recovery is crucial for effective treatment.
• Existing methods for determining minimal clinically important difference (MCID) may not fully capture patient perspectives.

Purpose of the Study:

• To determine patient-identified important change on the Neck Disability Index (NDI) within 7-10 days.
• To assess the credibility of these patient-identified change results.
• To compare patient-determined thresholds with researcher-defined methods.

Main Methods:

• Secondary analysis of a randomized clinical trial involving 42 participants with mechanical neck pain.
• Analysis of Neck Disability Index (NDI) and participant-reported global rating of change scores.
• Receiver operating characteristic (ROC) curves used to compute patient-important change; measurement error calculated using a standard formula.

Main Results:

• 36 out of 42 participants deemed the global rating of change important.
• Patient-important change was calculated at 3.5 NDI points, exceeding the statistical error of 2.16 NDI points.
• Credibility analysis indicated strong support for the patient-important change estimate, with 4 of 5 criteria met.

Conclusions:

• Patient-determined importance may establish a lower threshold for improvement compared to researcher-defined metrics.
• These findings suggest a more patient-centric approach to evaluating recovery from neck pain.
• This method may offer greater responsiveness to individual patient experiences of change.