Psychometric Characteristics of the Health Survey Questionnaire (SF-36) for Evaluation of Multiple Sclerosis: Psychometric Evaluation in Iranian Patients
Message:
Abstract:
Background And Objectives
Quality of life assessment as an outcomes measure in multiple sclerosis (MS) can have a key role in identifying adverse effects of the disease and the impact of different treatments in the progress and improvement of patients; Hence, the aim of this study was to examine the psychometric characteristics Persian version of the health survey questionnaire (SF-36) in the MS. Subjects and
Methods
One hundred and sixty two patients were selected by consecutive
Method
SF-36 was evaluated for its internal consistency reliability, construct validity, concurrent, predictive and differentiation. In order to achieve this aim, the Fatigue Severity Scale and the 21-question (DASS-21) of depression, anxiety and stress scale were used.
Results
Internal consistency of SF-36 subscales except social functioning and emotional problems (α= 0.42 to 0.93) were favorable. Analysis of the validity of the SF-36 showed that all of the questionnaire items had a strong positive correlation with subscales on their own (r=0.48 to 0.95); Each subscale had a strong and inverse correlation with the constructs of fatigue, depression, anxiety and stress (r= -0.27 to -0.71; P<0.001); SF-36 physical component predicted a significant proportion of the variance in score on fatigue (P<0.0001) and mental component also showed a significant proportion of the variance in scores on depression, anxiety and stress, even after controlling demographic confounding factors of age, sex, marital status and educational level (P<0.0001). The mean of all subscales was significantly greater in both groups of abnormal and fatigued patients than normal and nonfatigued patients.
Conclusion
Persian version of the SF-36 has good validity and reliability and could be used to assess the impact of MS outcomes on quality of life of patients.
Language:
Persian
Published:
Jundishapur Scientific Medical Journal, Volume:14 Issue: 4, 2015
Page:
367
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