Clinical Interpretation of the Neck Functional Status Computerized Adaptive Test

Area of Science:

• Rehabilitation Medicine
• Clinical Measurement
• Patient-Reported Outcomes

Background:

• Clinical interpretation of patient-reported outcome measures (PROMs) is vital for patient-centered care.
• The interpretation of scores from the Neck Functional Status Computerized Adaptive Test (NFS-CAT) has not been previously studied.
• Establishing clear interpretation frameworks for PROMs like the NFS-CAT is essential for effective clinical practice.

Purpose of the Study:

• To assess the reliability of point estimates and improvement scores derived from the NFS-CAT.
• To determine the minimal clinically important improvement (MCII) thresholds for the NFS-CAT.
• To develop a functional staging model for enhanced clinical interpretation of NFS-CAT scores.

Main Methods:

• A retrospective cohort analysis of 250,741 patients with neck impairments who completed the NFS-CAT.
• Reliability was assessed using the standard error of measurement (SEM) across the measurement continuum.
• MCII was estimated using combined distribution- and anchor-based approaches, with a functional staging model developed.

Main Results:

• The SEM was stable (3.7-3.9 points), with a minimal detectable improvement of 6.8 points.
• The estimated MCII was 8.1 points, requiring more change for lower baseline scores.
• The functional staging model demonstrated responsiveness, with significant changes observed during treatment.

Conclusions:

• This study provides a framework for interpreting NFS-CAT scores in outpatient rehabilitation for neck impairments.
• The findings facilitate better understanding of functional status changes for both clinicians and patients.
• The developed functional staging model enhances the clinical utility of the NFS-CAT.