Measuring posttraumatic growth and depreciation after spinal cord injury: A Rasch analysis
| Main Authors: | Kunz, Simon, Fellinghauer, Carolina, Peter, Claudio |
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| Format: | Article Journal |
| Terbitan: |
, 2019
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| Subjects: | |
| Online Access: |
https://zenodo.org/record/3687044 |
Daftar Isi:
- Purpose Individuals with spinal cord injury (SCI) may experience both positive (posttraumatic growth, PTG) and negative (posttraumatic depreciation, PTD) psychological changes following the injury. PTG and PTD were assessed using the 10-item short form of the posttraumatic growth inventory (PTGI-SF) and ten matched negatively worded items for PTD (selected from the PTGI-42) within Swiss Spinal Cord Injury Cohort Study (SwiSCI). This item selection is henceforth called PTG/D-SF. The objective of this study was to test the metric properties of the PTG/D-SF to determine the best strategy to derive reliable sum scores and to test the validity of several different structural conceptualizations. Method Using cross-sectional data (N=278), a series of unidimensional and multidimensional Rasch analyses of the PTG/D-SF (N=20) were performed. Rasch analyses were conducted separately for the items or by domains to investigate dimensionality, monotonicity, item and model fit and local item dependency of the instrument. Results The separate PTG and PTD items or their domains can be summated to form a unidimensional scale. Aggregation into domains improved the score distribution and increased the scope of the instruments. The reliability of the sum score for PTG was good (Person Separation: 0.81) the one for PTD admissible (Person Separation: 0.77). Conclusion PTG and PTD should be understood as distinct constructs rather than two ends of a continuum. Findings support the use of a PTG total score and to some degree the PTD total score. Future work could adapt the PTD items to improve the performance of the scale.
- + Sprache: eng + Publisher's Statement: ©American Psychological Association, 2019. This paper is not the copy of record and may not exactly replicate the authoritative document published in the APA journal. Please do not copy or cite without author's permission. The final article is available, upon publication, at: http://dx.doi.org/10.1037/rep0000288