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Cross-Cultural Adaptation and Evaluation of Psychometric Properties of Persian Version of Supports Intensity Scale among Adults with Intellectual and Developmental Disabilities

SALEHI, Sajed
JAVADIPOUR, Sheyda
NASSADJ, Gholamhossein
HAGHIGHI, Mohammad Hossein
SABOOR, Shiva
SHAKHI, Kamal
English
2018

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Purpose: This study was designed to translate and assess the psychometric properties of Supports Intensity Scale among adults with intellectual and developmental disability in Ahvaz and Tehran, Iran.

 

Method: The cross-sectional study was carried out in two stages. The first stage consisted of the forward-backward translation of Supports Intensity Scale - Adult Version) SIS-A(. In the second stage, 197 people with intellectual and developmental disabilities were recruited in order to assess the internal consistency and test-retest reliability, concurrent and content validity of SIS-A. The confirmatory factor analysis (CFA) was performed to approve the seven-factor model of the instrument.

 

Results: The intra-class correlation coefficient values varied between 0.85 and 0.99 (very good to excellent). All subscales of the SIS-A showed Cronbach’s alpha above 0.70. Correlation coefficient between SIS-A and Barthel index was about -0.65, which shows excellent concurrent validity of SIS-A. The findings showed SIS-A had high ability to discriminate between groups with different IQ (p<0.05). There was no significant correlation between SIS-A and the age of participants (p>0.05). The result of CFA confirmed that the seven-factor model of SIS-A is the fittest pattern for SIS-A.

 

Conclusion: The results indicated that the Persian version of SIS-A is a valid and reliable instrument to assess function and disability among people with intellectual and developmental disability.

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