Baseline dependency of minimal clinically important improvement
Ying-Chih Wang1, Dennis L Hart, Paul W Stratford
1Department of Occupational Science and Technology, University of Wisconsin-Milwaukee, PO Box 413, Enderis Hall 971, Milwaukee, WI 53201, USA. wang52@uwm.edu
Background:
Minimal clinically important improvement (MCII) is the smallest outcome measure change important to patients. Research suggests that MCII is dependent on patients' baseline functional status measures.
Objective:
The purposes of this study were: (1) to confirm whether MCII is dependent on patients' admission scores and (2) to test whether MCII is dependent on selected demographic characteristics.
Study Design And Setting:
This was a prospective, longitudinal, observational cohort study of 6,651 patients with orthopedic knee impairments treated in 332 outpatient rehabilitation clinics in 27 states in the United States.
Outcome Measures:
Patient self-reports of functional status (FS) from the Lower Extremity Functional Scale were assessed using a computerized adaptive testing application (0-100 scale).
Methods:
An anchored-based longitudinal method, with a 15-point Likert-type scale (-7 to +7), was used to provide a global rating of change (GROC). The MCII threshold for the GROC was defined at a cut-score of +3 or greater and was determined using nonparametric receiver operating characteristic curve analysis for each of the following variables: sex, symptom acuity, age group, and quartile of baseline FS scores.
Results:
The results showed that MCII was dependent on patient baseline and demographic characteristics. Patients who were male, were younger, had more-acute symptoms, or had lower FS scores at admission required more FS change to report meaningful change.
Limitations:
As this study was a secondary analysis, how the length of treatment mediated the relationship between the independent and dependent variables was unclear.
Conclusions:
Although a single MCII index may provide a standard cut-score defining the smallest FS change that is meaningful to patients, researchers and clinicians should be aware that MCII is context specific and not a fixed attribute. Current results may help researchers, clinicians, and policy makers to interpret FS change related to the importance of the change to the patient.
Insights
Minimal clinically important improvement (MCII) varies based on patient factors like age and baseline function. Understanding these differences is key for interpreting functional status changes in rehabilitation.
Area of Science:
- Rehabilitation Medicine
- Orthopedics
- Patient-Reported Outcomes
Background:
- Minimal Clinically Important Improvement (MCII) represents the smallest change in outcome measure meaningful to patients.
- Existing research indicates MCII is influenced by a patient's initial functional status.
Purpose of the Study:
- To determine if MCII is dependent on patients' admission scores.
- To assess if MCII is influenced by demographic characteristics.
Main Methods:
- Prospective, longitudinal, observational cohort study of 6,651 orthopedic knee patients.
- Functional Status (FS) assessed via Lower Extremity Functional Scale (0-100 scale).
- MCII threshold determined using receiver operating characteristic analysis based on Global Rating of Change (GROC) and baseline variables.
Main Results:
- MCII was found to be dependent on baseline and demographic characteristics.
- Male patients, younger patients, those with acute symptoms, and those with lower baseline FS scores required greater FS change to perceive improvement.
Conclusions:
- MCII is context-specific and not a fixed value.
- Researchers and clinicians should consider patient-specific factors when interpreting functional status changes.
- Findings aid in understanding the importance of FS change to patients for researchers, clinicians, and policymakers.
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