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Assessment of cognition in Parkinson's disease
Marinus J, Visser M, Verwey NA, Verhey FR, Middelkoop HA, Stiggelbout AM, van Hilten JJ.. Neurology, 2003-11-01
Topic: Risk, prevention and care in population studies
Plain-language summary
Objective To develop a short, practical instrument that is sensitive to the specific cognitive deficits in Parkinson's disease (PD) for comparing groups in research situations and for assessing change in cognitive functioning over time. Methods A literature search was conducted to identify the most frequently affected cognitive domains in PD and to select candidate items for the initial scale. This scale was tested in 85 patients and 75 age-, education-, and sex-matched control subjects.
Cite this study APA, Vancouver, BibTeX · download .bib or .ris
APA 7th
Marinus, J., Visser, M., Verwey, N. A., Verhey, F. R., Middelkoop, H. A., Stiggelbout, A. M., et al. (2003). Assessment of cognition in Parkinson's disease. Neurology. https://doi.org/10.1212/01.wnl.0000091864.39702.1c
Vancouver
Marinus J, Visser M, Verwey NA, Verhey FR, Middelkoop HA, Stiggelbout AM, et al. Assessment of cognition in Parkinson's disease. Neurology. 2003. doi:10.1212/01.wnl.0000091864.39702.1c. PMID: 14610124.
BibTeX
@article{marinus2003-14610124,
author = {Marinus, J. and Visser, M. and Verwey, N. A. and Verhey, F. R. and Middelkoop, H. A. and Stiggelbout, A. M. and van Hilten, J. J.},
title = {{Assessment of cognition in Parkinson's disease}},
journal = {Neurology},
year = {2003},
doi = {10.1212/01.wnl.0000091864.39702.1c},
pmid = {14610124},
url = {https://doi.org/10.1212/01.wnl.0000091864.39702.1c}
}
Built from the record alzhub holds for this paper, not looked up. Volume, issue and page numbers are not held in the record. The record names 7 authors; APA and Vancouver show the first six, BibTeX and the downloads carry all of them. Check the citation against the original before you use it.
Key findings
- Methods A literature search was conducted to identify the most frequently affected cognitive domains in PD and to select candidate items for the initial scale.
- This scale was tested in 85 patients and 75 age-, education-, and sex-matched control subjects.
- Items that met predefined criteria for data quality, reproducibility, and discriminative properties were included in the final scale.
- Results The final scale, the SCOPA-COG (SCales for Outcomes of PArkinson's disease-cognition), consists of 10 items with a maximum score of 43, with higher scores reflecting better performance.
Why it matters
This study developed a short instrument, the SCOPA-COG, to assess the specific cognitive deficits of Parkinson's disease, testing it in 85 patients and 75 matched control subjects. It is a cognitive assessment tool and does not treat, cure or prevent Alzheimer's disease.
Study details
- Participants85
- Evidence strengthLow
How this study scored 51/100
Published in a leading specialty journal. Scored zero for study design, effect reported and randomized / blinded because the record does not state it.
| Component | Points | Why |
|---|---|---|
| Journal tier | 9 / 10 | Tier 2 — leading specialty journal (Neurology) |
| Journal's citation record | 4 / 4 | Neurology: journal h-index 525 (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 | 1 / 5 | 2003 — older than 20 years, still counted |
| Sample size | 1 / 4 | 85 participants |
| Effect reported | 0 / 3 | No effect size reported — scores zero (not stated in the record — scored 0) |
| Studied in people | 3 / 3 | Studied in people (participant count stated) |
| Randomized / blinded | 0 / 2 | No randomization or blinding stated — scores zero (not stated in the record — scored 0) |
| Times cited | 6 / 7 | Cited 339 times (OpenAlex, 2026-10-10) |
| Citations per year | 3 / 5 | 13.6 citations a year over 25 year(s) since 2003 |
| Impact for its field and year | 3 / 6 | Cited 3.5× the average for papers of its field and year (OpenAlex FWCI) |
| Cited by studies here | 2 / 6 | Cited by 9 other studies in this library |
| Still being cited | 2 / 4 | Cited 28 times in 2024–2026 (2026 still in progress; OpenAlex) |
| Senior author's track record | 2 / 4 | Last-listed author J.J. van Hilten: h-index 32 (OpenAlex, whole career) |
| Institution's track record | 1 / 3 | Utrecht University: institution h-index 1,157 (OpenAlex) |
| Multicenter collaboration | 1 / 3 | OpenAlex lists 3 institution(s) in 1 country |
| Indexed in PubMed | 2 / 2 | Indexed in PubMed (PMID 14610124) |
| Free to read | 0 / 2 | Behind a paywall — scores zero |
| Total | 51 / 100 | — |
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