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Reliability and Validity of the Clinical Assessment of Sub-Optimal Interaction in Outpatient Pediatric Rehabilitation

Abstract Externalizing behaviors are prevalent in pediatric and mental health settings and may lead to sub-optimal therapist-client interaction. The Clinical Assessment of Sub-optimal Interaction – Short Form (CASI-SF) evaluates therapist-child interactions that may pose a barrier to the therapeutic relationship. Reliability and validity of the CASI-SF was evaluated in outpatient pediatric rehabilitation. The CASI-SF demonstrated good internal consistency and inter-rater reliability. There was no evidence of differential item functioning, ceiling, or floor effects. Rating scale functioning, dimensionality, item and person fit, and item separation supported structural validity; person separation was low. These findings support the reliability and validity of the CASI-SF.