Adaptive Measurement of Change: A Novel Method to Reduce Respondent Burden and Detect Significant Individual-Level Change in Patient-Reported Outcome Measures.
David J Weiss, Chun Wang, Andrea L Cheville and 2 others
PMID 34606759WHAT IT FOUND
Adaptive testing reduced follow-up questionnaire length by 55% and time by 53% for hospitalized patients showing significant functional change.
The method detected individual improvement or decline while maintaining precision, though it currently lacks stopping rules for stable patients.
Key findings
01Among patients with detected change, the adaptive method reduced items by 55% and test time by 53%.
02The procedure identified significant multivariate change in roughly one-quarter of patients completing follow-up assessments.
03Detection rates varied by domain, with Basic Mobility showing the highest rate of significant change and Applied Cognition the lowest.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTsWhat it means for SLPs
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What it does not show
The study was retrospective; the adaptive stopping rules for significant change were simulated after data collection rather than used in real time. The method currently lacks efficient stopping rules for patients who do not change, meaning stable patients may still undergo lengthy assessments. Detection of change varied significantly by domain due to differences in item bank quality, with Applied Cognition being the least precise. The analysis did not validate the statistical significance of change against clinicians' or patients' own perceptions of whether change occurred. The study relied on true item response theory parameters in simulations, whereas real-world applications must account for parameter estimation errors.
Declared interests
The authors declared no conflicts of interest.
The easy way to misread this
Do not assume the 55% reduction in test burden applies to all patients. This efficiency gain was only calculated for the subset of patients where the algorithm detected significant change. Patients whose status remained stable did not benefit from this reduction in the current implementation.