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Test–retest reliability of the computer-based cognitive assessment tool for community-dwelling older adults in Japan: The Otassha study
Jou‐Yin Chen, Hisashi Kawai, Junta Takahashi, Manami Ejiri, Keigo Imamura, Shuichi P. Obuchi. Digital Health, 2025-01-01
Topic: Risk, prevention and care in population studies
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 z-scores, and the total CompBased-CAT score was computed by summing these z-scores. Test–retest reliability was assessed using paired t-tests and intraclass correlation coefficient (ICC) two-way random-effects models, with analyses stratified by age, sex, and MCI status. Results A total of 80 participants (mean age: 76.8 years; 27.5% male) were analyzed. Paired t-tests showed no significant difference in total scores between the pre-test (mean = −0.75; standard deviation [SD] = 3.73) and the post-test (mean = −0.42; SD = 4.45). The total score exhibited an ICC of 0.64 (95% confidence interval [CI] = 0.49–0.75) for all participants, increasing to 0.74 (95% CI = 0.48–0.88) among those with MCI. 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.
Cite this study APA, Vancouver, BibTeX · download .bib or .ris
APA 7th
Chen, J., Kawai, H., Takahashi, J., Ejiri, M., Imamura, K., & Obuchi, S. P. (2025). Test–retest reliability of the computer-based cognitive assessment tool for community-dwelling older adults in Japan: The Otassha study. Digital Health. https://doi.org/10.1177/20552076251317627
Vancouver
Chen J, Kawai H, Takahashi J, Ejiri M, Imamura K, Obuchi SP. Test–retest reliability of the computer-based cognitive assessment tool for community-dwelling older adults in Japan: The Otassha study. Digital Health. 2025. doi:10.1177/20552076251317627. PMID: 39949846.
BibTeX
@article{chen2025-39949846,
author = {Chen, Jou‐Yin and Kawai, Hisashi and Takahashi, Junta and Ejiri, Manami and Imamura, Keigo and Obuchi, Shuichi P.},
title = {{Test–retest reliability of the computer-based cognitive assessment tool for community-dwelling older adults in Japan: The Otassha study}},
journal = {Digital Health},
year = {2025},
doi = {10.1177/20552076251317627},
pmid = {39949846},
url = {https://doi.org/10.1177/20552076251317627}
}
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Key findings
- Results A total of 80 participants (mean age: 76.8 years; 27.5% male) were analyzed.
- Paired t-tests showed no significant difference in total scores between the pre-test (mean = −0.75; standard deviation [SD] = 3.73) and the post-test (mean = −0.42; SD = 4.45).
- 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.
Why it matters
This study found that a computer-based cognitive assessment tool had good test-retest reliability over about two months in community-dwelling older Japanese adults, with an ICC of 0.64 overall and 0.74 among participants with MCI. It is about a monitoring tool and does not treat, cure or prevent Alzheimer's disease.
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Study details
- Participants80
- Effect size27.5%
- Evidence strengthLow
How this study scored 40/100
Published in a peer-reviewed journal. Scored zero for study design and randomised / blinded because the record does not state it.
| Component | Points | Why |
|---|---|---|
| Journal tier | 7 / 10 | Tier 3 — peer-reviewed journal (Digital Health) |
| Journal's citation record | 1 / 4 | Digital Health: journal h-index 77 (OpenAlex, 2026-10-29) |
| Study design | 0 / 12 | No study design recorded — scores zero, not guessed (not stated in the record — scored 0) |
| Strength of evidence | 1 / 5 | Rated “low” in our summary |
| Peer-review validation | 10 / 10 | Peer-reviewed. Published as an article in a named peer-reviewed journal. |
| How recent | 4 / 5 | 2025 — within 3 year(s) of the newest study here |
| Sample size | 1 / 4 | 80 participants |
| Effect reported | 2 / 3 | Effect reported as a number, without an interval or test |
| Studied in people | 3 / 3 | Studied in people (participant count stated) |
| Randomised / blinded | 0 / 2 | No randomisation or blinding stated — scores zero (not stated in the record — scored 0) |
| Times cited | 1 / 7 | Cited 3 times (OpenAlex, 2026-10-10) |
| Citations per year | 1 / 5 | 1.0 citations a year over 3 year(s) since 2025 |
| Impact for its field and year | 2 / 6 | Cited 1.9× the average for papers of its field and year (OpenAlex FWCI) |
| Cited by studies here | 0 / 6 | No other study in this library cites it |
| Still being cited | 1 / 4 | Cited 3 times in 2024–2026 (2026 still in progress; OpenAlex) |
| Senior author's track record | 2 / 4 | Last-listed author Shuichi P. Obuchi: h-index 35 (OpenAlex, whole career) |
| Institution's track record | 0 / 3 | Meiji Yasuda Life Foundation of Health and Welfare: institution h-index 43 (OpenAlex) |
| Multi-centre collaboration | 0 / 3 | OpenAlex lists 1 institution(s) in 1 country — scores zero (affiliation lists can be incomplete) |
| Indexed in PubMed | 2 / 2 | Indexed in PubMed (PMID 39949846) |
| Free to read | 2 / 2 | Free to read |
| Total | 40 / 100 | — |
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