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Longitudinal and dynamic measurement invariance of the FACIT-Fatigue scale: an application of the measurement model of derivatives to ECOG-ACRIN study E2805.
- Source :
- Quality of Life Research; Jun2018, Vol. 27 Issue 6, p1589-1597, 9p, 3 Charts, 2 Graphs
- Publication Year :
- 2018
-
Abstract
- <bold>Purpose: </bold>While quality of life measures may be used to assess meaningful change and group differences, their scaling and validation often rely on a single occasion of measurement. Using the 13-item FACIT-Fatigue questionnaire at three timepoints, this study tests whether individual items change together in ways consistent with a general fatigue factor.<bold>Methods: </bold>The measurement model of derivatives (MMOD) is a novel method for measurement evaluation that directly assesses whether a given factor structure accurately describes how individual test items change over time. MMOD transforms item-level longitudinal data into a set of orthogonal change scores, each one representing either a within-person longitudinal mean or a different type of longitudinal change. These change scores are then factor analyzed and tested for invariance. This approach is applied to the FACIT-Fatigue scale in a sample of patients with renal cell carcinoma treated on 'ECOG-ACRIN Cancer Research Group (ECOG-ACRIN) study 2805.<bold>Results: </bold>Analyses revealed strong evidence of unidimensionality, and apparent factorial invariance using traditional techniques. MMOD revealed a small but statistically significant difference in factor structure ([Formula: see text], [Formula: see text]), where factor loadings were weaker and more variable for measuring longitudinal change.<bold>Conclusions: </bold>The differences in factor structure were not large enough to substantially affect scale usage in this application, but they do reveal some variability across items in the FACIT-Fatigue in their ability to detect change. Future applications should consider differential sensitivity of individual items in multi-item scales, and perhaps even capitalize upon these differences by selecting items that are more sensitive to change. [ABSTRACT FROM AUTHOR]
- Subjects :
- FATIGUE (Physiology)
QUALITY of life measurement
RENAL cell carcinoma
FACTOR analysis
QUALITY of life
PATIENTS
PSYCHOMETRICS
RESEARCH evaluation
CHI-squared test
RESEARCH funding
SCALE analysis (Psychology)
MULTITRAIT multimethod techniques
RESEARCH methodology evaluation
STATISTICAL models
DIAGNOSIS
Subjects
Details
- Language :
- English
- ISSN :
- 09629343
- Volume :
- 27
- Issue :
- 6
- Database :
- Complementary Index
- Journal :
- Quality of Life Research
- Publication Type :
- Academic Journal
- Accession number :
- 129610735
- Full Text :
- https://doi.org/10.1007/s11136-018-1817-4