A French adaptation of the Overt Behaviour Scale (OBS) measuring challenging behaviours following acquired brain injury: The Échelle des comportements observables (ÉCO).

Purpose: To develop a French version of the Overt Behaviour Scale (OBS) and examine some of its psychometric properties.Methods: The scale was adapted and validated according to standard guidelines for cross-cultural adaptation of questionnaires (Echelle des comportements observables; ECO). The reliability and construct validity of the ECO were studied among 29 inpatients and outpatients who sustained an acquired brain injury. The instruments were administered by 12 clinicians located at eight rehabilitation centres and the local brain injury association.Results: The ECO provided behaviour profile descriptives much like the original scale. It showed excellent reliability and good convergent and divergent validity, as reflected by significant associations with other measures that contained similar behavioural items and by the absence of signification correlations with broader constructs such as physical and cognitive abilities.Conclusion: This study provides evidence that the ECO behaves much like the original OBS, has promising initial findings with respect to reliability and validity and is a valuable research and clinical instrument to assess the severity and typology of challenging behaviour after an acquired brain injury and to monitor the evolution of behaviours after intervention in French and bilingual communities.