AIM: Early detection of dementia is crucial for effective intervention. The computer-based cognitive assessment tool (CompBased-CAT) was designed to assess cognitive function using a tablet computer. While its predictive validity for mild cognitive impairment (MCI) is established, its test-retest reliability remains unclear. This study aimed to evaluate the test-retest reliability of CompBased-CAT among older Japanese adults in a community setting. METHODS: This is a methodological study that examined the test-retest reliability of CompBased-CAT. Community-dwelling older adults aged 65 years or older who participated in both the pre-test and post-test were included. Pre-test assessments were conducted during the 2023 Otassha study from 28 September to 8 October 2023, with the post-test administered 62 days (±14 days) later. Subtest scores were normalized to RESULTS: A total of 80 participants (mean age: 76.8 years
27.5% male) were analyzed. Paired CONCLUSION: CompBased-CAT demonstrated good test-retest reliability, with an ICC of 0.64 among all participants, which increased to 0.74 among participants with MCI over a 2-month period, indicating its potential for monitoring cognitive function through repeated assessments.