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Multicentric psychometric study.The aim of this study is to introduce the development of the Sitting Balance Assessment for Spinal Cord Injury (SitBASCI) and assess its inter-rater reliability and internal consistency.The study was developed among the three Spinal Units of San Bortolo Hospital in Vicenza, Niguarda Hospital in Milan and AOU Careggi in Florence.SitBASCI is a 13-item scale developed to evaluate trunk control in individuals with SCI. Subjects were filmed while performing the 13 items of the scale. The videotapes were submitted to 25 examiners who evaluated patients' performances with the scale. The power of the study was estimated. The interclass correlational coefficient (ICC) was used to assess the inter-rater reliability of the examiner's evaluations regarding each item and the total. Cronbach's alpha was used to assess internal consistency of the scale and internal consistency of the scale on the eliminated item.The study showed to have a significant power. The inter-rater reliability for the total score was pSitBASCI had a high inter-rater reliability and internal consistency. Items had also good inter-rater reliability and item-total correlation. Therefore, SitBASCI could be proposed as a good and reliable instrument for Italian clinicians to evaluate sitting balance and trunk control in patient with SCI despite of aetiology and level of injury.