eS64 WCPT Congress 2015 / Physiotherapy 2015; Volume 101, Supplement 1 eS26–eS426 Purpose: To provide a reliable and valid tool in Arabic language that can be used to examine back beliefs among people with LBP and to examine the difference in back beliefs with different pain intensity and level of disability in people with LBP. Methods: 115 people with LBP participated in the study. 25 out of the 115 participants were included in the test- retest (with 7 to 10 days interval) reliability evaluation. BBQ was translated into Arabic language and was culturally adapted according to current cross-cultural adaptation guide- lines for patient reported outcomes. The Arabic BBQ along with Oswestry Disability Questionnaire and pain intensity scale were administered. Psychometric testing was done by assessing internal consistency and construct validity (factor structure). Further, correlation matrix with other scales was carried out. Results: Factor analysis of the BBQ revealed a 3-factor structure, explaining 46% of total variance with the first factor alone explaining 24% of the total variance. 8 of the 9 items suggested by the scale developers to be used in calculating the scale score loaded only on the first factor thus forming a unidimentional scale measuring one construct. The internal consistency of the Arabic BBQ (Cronbach α) was 0.77. The test-retest reliability (interclass correlation coeffi- cient) was excellent at .88 at (95% confidence interval from 0.80 to 0.94). There was a significant positive correlation (r = .62, P < 0.01) between the scores of the BBQ from the first and second administration. A significant negative correlation was found between disability scores and BBQ scores (r = -.307, P < 0.01), while, no correlation was found between BBQ and pain intensity scale. Furthermore, no floor or ceiling effects in the Arabic BBQ were found. Conclusion(s): The Arabic version of the BBQ was found to have good internal consistency, test–retest reliability with the factorial structure and pattern of association with other variable supporting the validity of the scale in assessing neg- ative beliefs in people with LBP. Implications: psychological screening tools in Arabic language are lacking. Arabic BBQ can help clinicians to iden- tify people with negative beliefs toward their LBP that may lead to developing more disability. Keywords: Back beliefs; Low back pain; Outcome mea- surement Funding acknowledgements: The Interdisciplinary MSK Pain Research Group, Physiotrio clinics, Riyadh, Saudi Arabia. Ethics approval: College of Applied Medical Sciences Research Ethics Committee, King Saud University, Saudi Arabia. http://dx.doi.org/10.1016/j.physio.2015.03.186 Research Report Platform Presentation Number: RR-PL-2860 Monday 4 May 2015 09:03 Room 334–335 DEVELOPMENT AND VALIDATION OF AN ARABIC VERSION OF THE FATIGUE SEVERITY SCALE H. Alsobayel 1 , H. Alhugail 2 , R. Alsaif 2 , N. Albawardi 3 , A. Alnahdi 1 , A. Daif 4 , H. Alarfaj 4 1 King Saud University, Rehabilitation Sciences, Riyadh, Saudi Arabia; 2 King Khalid University Hospital, Riyadh, Saudi Arabia; 3 Prince Sultan Centre for Special Education Services, Riyadh, Saudi Arabia; 4 King Saud University, Faculty of Medicine, Riyadh, Saudi Arabia Background: Fatigue has been reported as one of the consequences of variety of chronic conditions such as multi- ple sclerosis (MS) and systemic lupus erythematous (SLE). Tools, such as Fatigue Severity Scale (FSS), have been devel- oped to measure fatigue from patient perspective. Such tools need to be available in different languages in order to accom- modate the needs of multi-cultural populations. Purpose: The aim of this study was to develop and test the reliability and validity of an Arabic version of the Fatigue Severity Scale (FSS-Ar). Methods: Forward and backward translations of the FSS- Ar were conducted. The FSS-Ar was then tested on a sample of convenience comprising 24 patients with multiple scle- rosis (MS), 28 patients with systemic lupus erythematosus (SLE) and 31 healthy subjects. Exploratory factor analysis and hypothesis testing methods were used to examine the construct validity of the FSS-Ar. The Correlation between FSS-Ar and the energy and fatigue domain of the RAND-36 was examined for testing the construct validity of the scale. Internal consistency and test-retest reliability were tested on a sub-group of 10 participants. A receiver Characteristic curve (ROC) was used to determine the optimal cutoff of the FSS-Ar to define fatigue. Results: When a score of 4.05 and above was used to define fatigue, 39 patients out of 52 was classified as having fatigue (75%) while 10 out of 31 healthy individual were clas- sified as having fatigue (32%). The test-retest reliability and internal consistency was acceptable (ICC 2, 1 = 0.80; Cron- bach’s alpha = 0.84 respectively). The correlation between the FSS-Ar and the vitality domain of the SF-36 was accept- able (r = -0.46). The results of the factor analysis showed that items of the FSS-Ar measures one underlying construct, fatigue. All the scale items showed meaningful loadings on the first underlying factor. The FSS-Ar was able to measure and quantify the severity of fatigue and differentiate between patients with MS or SLE and healthy subjects. Conclusion(s): An Arabic translation of the FSS showed acceptable psychometric properties in MS and SLE patients