Initial psychometric evaluation of the Portuguese version of the Canine Brief Pain Inventory

OBJECTIVE To perform the initial psychometric evaluation of the Portuguese version of the Canine Brief Pain Inventory (CBPI).ANIMALS A total of 100 dogs, 50 with bilateral hip osteoarthritis and 50 unaffected dogs.PROCEDURES The 2 groups of dogs were assessed using the CBPI. The English version of the CBPI (divided into a pain sever- ity score and a pain interference score) was translated into Portuguese, and a copy of the translated version was completed by native Portuguese speakers' canine handlers. The results from the 2 groups were compared, and psychometric properties were evaluated. Construct validity was evaluated by assessing differences between animals with osteoarthritis and unaffected animals with the Mann-Whitney test. Further evaluation was performed with the Kaiser-Meyer-Olin measure of sampling adequacy, Eigenvalue, and scree-plot analysis. Internal consistency was tested with Cronbach alpha.RESULTS A significant difference was observed between dogs with osteoarthritis and unaffected dogs in pain severity and pain interference scores (P < .01 for both), one indication of construct validity. Cronbach alpha was 0.99, and a high interitem correlation was observed, showing strong internal consistency. One factor accounted for 92.3% of the total variance.CLINICAL RELEVANCE We presented the initial validation of the Portuguese version of the CBPI and its validity in the Portuguese language. It is an essential step in providing a valid tool for clinicians to assess pain in dogs with osteoarthritis. Further studies are required to determine if the present results can be replicated across samples with different characteristics and evaluate response to treatment.