Hiroshi Takasaki1, Julia Treleaven. 1. NHMRC Centre of Clinical Research Excellence-Spinal Pain, Injury and Health, Division of Physiotherapy, School of Health and Rehabilitation Science, The University of Queensland, Brisbane, QLD 4072, Australia. h.takasaki@uq.edu.au
Abstract
OBJECTIVE: To investigate an appropriate scoring system and unidimensionality using Rasch analysis, discriminant validity, and reliability of the Fatigue Severity Scale (FSS) in people with chronic neck pain. DESIGN: Cross-sectional. SETTING: Tertiary institution. PARTICIPANTS: Patients with chronic neck pain (n=100) and asymptomatic controls (n=40). INTERVENTIONS: Not applicable. MAIN OUTCOME MEASURE: The FSS. RESULTS: Twenty-six of the 100 participants with chronic neck pain agreed to complete the FSS again within 1 week after the first administration for the assessment of the test-retest reliability. Two items obviously threatening unidimensionality were eliminated, and the 7-item FSS was developed through Rasch analyses. The 7-item FSS demonstrated the appropriateness of its 7-point scale and adequate internal consistency (Rasch-generated reliability, .83-.91). The 7-item FSS had a negligible floor effect (1%) and ceiling effect (2%). The item-person map demonstrated limited distribution of item difficulty in comparison with the distribution of person ability. The chronic neck pain group demonstrated significantly (P<.001) higher scores in the 7-item FSS than the control group, indicating discriminant validity. The 7-item FSS also demonstrated adequate test-retest reliability with a mean interval of 4.1 days (n=26) for each item (quadratic-weighted κ=.83-.94), and as a whole (intraclass correlation coefficient=.95). A 0-to-100 scale table reflecting Rasch scores was developed, and the minimum detectable change was 9.5 in the 0 to 100 scale. CONCLUSION: The 7-item FSS appears unidimensional and reliable, and can be used quickly in clinical practice to gain a basic understanding of fatigue symptoms in people with chronic neck pain. Further, it is possible to modify the 7-item FSS to enhance discriminant ability within people with chronic neck pain by adding additional items, enlarging the distribution of item difficulty.
OBJECTIVE: To investigate an appropriate scoring system and unidimensionality using Rasch analysis, discriminant validity, and reliability of the Fatigue Severity Scale (FSS) in people with chronic neck pain. DESIGN: Cross-sectional. SETTING: Tertiary institution. PARTICIPANTS: Patients with chronic neck pain (n=100) and asymptomatic controls (n=40). INTERVENTIONS: Not applicable. MAIN OUTCOME MEASURE: The FSS. RESULTS: Twenty-six of the 100 participants with chronic neck pain agreed to complete the FSS again within 1 week after the first administration for the assessment of the test-retest reliability. Two items obviously threatening unidimensionality were eliminated, and the 7-item FSS was developed through Rasch analyses. The 7-item FSS demonstrated the appropriateness of its 7-point scale and adequate internal consistency (Rasch-generated reliability, .83-.91). The 7-item FSS had a negligible floor effect (1%) and ceiling effect (2%). The item-person map demonstrated limited distribution of item difficulty in comparison with the distribution of person ability. The chronic neck pain group demonstrated significantly (P<.001) higher scores in the 7-item FSS than the control group, indicating discriminant validity. The 7-item FSS also demonstrated adequate test-retest reliability with a mean interval of 4.1 days (n=26) for each item (quadratic-weighted κ=.83-.94), and as a whole (intraclass correlation coefficient=.95). A 0-to-100 scale table reflecting Rasch scores was developed, and the minimum detectable change was 9.5 in the 0 to 100 scale. CONCLUSION: The 7-item FSS appears unidimensional and reliable, and can be used quickly in clinical practice to gain a basic understanding of fatigue symptoms in people with chronic neck pain. Further, it is possible to modify the 7-item FSS to enhance discriminant ability within people with chronic neck pain by adding additional items, enlarging the distribution of item difficulty.
Authors: Bahar Shahidi; Robyn W Bursch; Jennifer S Carmel; Ashleigh C Carranza; Kelsey M Cooper; Jayme V Lee; Colleen N O'Connor; Scott F Sorg; Katrina S Maluf; Dawn M Schiehser Journal: Mil Med Date: 2021-11-02 Impact factor: 1.437
Authors: Yolanda Nadal-Nicolás; Jacobo Ángel Rubio-Arias; María Martínez-Olcina; Cristina Reche-García; María Hernández-García; Alejandro Martínez-Rodríguez Journal: Int J Environ Res Public Health Date: 2020-06-26 Impact factor: 3.390
Authors: Hiroshi Takasaki; Kazuki Kikkawa; Hiroki Chiba; Yusuke Handa; Albert Sesé-Abad; Juan Carlos Fernández-Domínguez Journal: Prog Rehabil Med Date: 2021-08-27