Validation of the brief version of the cancer behavior inventory in breast cancer Portuguese patients

Self-efficacy is a coping resource with a positive impact on well-being, quality of life, anxiety, and depression in cancer patients, even after treatment. This study focused on the validation of the Cancer Behavior Inventory-Brief Version (CBI-B) in Portuguese patients with breast cancer. The study included 115 patients with breast cancer receiving outpatient chemotherapy in four hospitals located in Portugal. Participants (N = 115) completed the translated version of the CBI-B in Portuguese and measures of quality of life (QLQ- C30), psychological distress (HADS), and illness perceptions (IPQ-B). Confirmatory factor analysis supported the four-factor original structure of the CBI-B. The Portuguese version of the CBI-B showed good psychometric properties as shown by measures of internal consistency (Cronbach’s alpha = .88), test–retest reliability (intraclass correlation coefficient = .59), convergent validity with the QLQ-C30 (r = .43, p < .001), and divergent validity with the HADS (r = -.60, p < .001) and the IPQ-B (r = -.51, p < .001). The Portuguese version of the CBI-B is a valid and reliable instrument to evaluate the self-efficacy for coping in Portuguese breast cancer patients. Future studies should validate the CBI-B in patients with other types of cancer.instrument to evaluate the self-efcacy for coping in Portuguese breast cancer patients. Future studies should validate the CBI-B in patients with other types of cancer.
This study was conducted at the Psychology Research Centre
(PSI/01662), School of Psychology, University of Minho, supported
by the Foundation for Science and Technology (FCT) through the
Portuguese State Budget (Ref.: UIDB/PSI/01662/2020) and a PhD
fellowship awarded to frst author (SFRH/BD/137321/2018 PHD Fel lowship) supported by the FCT and European Social Fund (Human
Capital Operational Programme—HCOP)