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Assessing functioning in adolescents with chronic fatigue syndrome: psychometric properties and factor structure of the School and Social Adjustment Scale and the Physical Functioning Subscale of the SF36

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Original languageEnglish
JournalBehavioural and Cognitive Psychotherapy
Accepted/In press13 Feb 2020

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Abstract

BACKGROUND: Chronic fatigue syndrome (CFS) has a major impact on functioning. However, no validated measures of functioning for this population exist.
AIMS: We aimed to establish the psychometric properties of the 5-item School and Social Adjustment Scale (SSAS) and the 10-item Physical Functioning Subscale of the SF-36 in adolescents with CFS.
METHOD: Measures were completed by adolescents with CFS (N = 121).
RESULTS: For the Physical Functioning Subscale, a two-factor solution provided a close fit to the data. Internal consistency was satisfactory. For the SSAS, a one factor solution provided an adequate fit to the data. The internal consistency was satisfactory. Inter-item and item-total correlations did not indicate any problematic items and functioning scores were moderately correlated with other measures of disability, providing evidence of construct validity.
CONCLUSION: Both measures were found to be reliable and valid and provide brief measures for assessing these important outcomes. Henceforth, we recommend that the Physical Functioning Subscale be used as 2 subscales in adolescents with CFS.

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