Supplementary Material for: Adapting and Validating the Communicative Activities Checklist (COMACT) to Portuguese: A Preliminary Investigation with People with Aphasia

Aims: To translate and adapt the Communicative Activities Checklist (COMACT), initially developed in Australian English, into European Portuguese (EP) and to analyse its validity and reliability, with a sample of Portuguese people with aphasia (PWA) and neurologically healthy people (NHP). Methods: The following phases were completed: forward translation, back-translation, development of a set of instructions, evaluation by a specialist committee of the different versions, cognitive debriefing, and a discussion group about the final COMACT-EP and its use with a sample of Portuguese PWA and NHP. Cognitive debriefing data were analysed both qualitatively (Thematic analysis) and quantitatively (Content Validity Index – CVI). Concurrent validity with the Communication Disability Profile - European Portuguese (CDP-EP) Activity subscale (Spearman’s correlation), internal consistency (Cronbach’s α) and test-retest (Wilcoxon test) were also analysed. Results: The CVI obtained was excellent. The instructions were considered clear, and COMACT-EP was found to be easy to complete and of adequate length. Most of its items were regarded as clear, easy to understand, and relevant. However, the need for improvement was also highlighted. It was suggested that certain items be added and others revised to enhance clarity. Test-retest results revealed stability in the majority of its items. The IC of the COMACT-EP categories “Talking” and “Listening” was found to be low, and the concurrent validity with the CDP-EP Activities subscale was somewhat limited. Conclusions: It is necessary to continue revising and rewording certain items of the COMACT-EP and to include a larger sample of PWA, representing a broader range of ethnic, geographic, and cultural backgrounds, as well as different types of aphasia and levels of severity.