The Activity Card Sort (ACS) measures activity engagement levels. The Activity Card Sort-Australian version for adults aged 18 to 64 (ACS-Aus (18-64)) was recently developed, and psychometric properties have not yet been determined. This study was established to determine the test-retest reliability and internal consistency of the ACS-Aus (18-64) and describe activity engagement trends for healthy adults. Fifty-four adults aged 18 to 64 participated in this descriptive study. The ACS-Aus (18-64) demonstrated excellent test-retest reliability ( r = .92, p < .001) and acceptable internal consistency (α = .83). Adults aged 18 to 40 retained a lower percentage of activities than adults aged 41 to 64 for personal care, daily life, home maintenance activities ( t = -2.22, p = .03), and recreation and relaxation activities ( t = -2.38, p = .02). The ACS-Aus (18-64) may be used to explore the activity engagement patterns of community-dwelling Australian adults aged 18 to 64. Further research will determine validity for clinical populations.
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