Testing cognitive function in elderly populations: the PROSPER study
- P J Houx1,
- J Shepherd2,
- G-J Blauw3,
- M B Murphy4,
- I Ford2,
- E L Bollen3,
- B Buckley4,
- D J Stott2,
- W Jukema3,
- M Hyland4,
- A Gaw2,
- J Norrie2,
- A M Kamper3,
- I J Perry4,
- P W MacFarlane2,
- A Edo Meinders3,
- B J Sweeney4,
- C J Packard2,
- C Twomey4,
- S M Cobbe2,
- R G Westendorp3
- 1University Maastricht, Maastricht, The Netherlands
- 2University Glasgow, Glasgow, Scotland
- 3Leiden University Medical Centre, Leiden, The Netherlands
- 4University Cork, Cork, Ireland
- Correspondence to: Dr R G J Westendorp, Section of Gerontology and Geriatrics, Leiden University Medical Center, C-2-R, PO box 9600, 2300 RC Leiden, The Netherlands; R.G.J.Westendorp{at}LUMC.nl
- Received 29 April 2002
- Accepted 3 July 2002
- Revised 1 July 2002
Abstract
Objectives: For large scale follow up studies with non-demented patients in which cognition is an endpoint, there is a need for short, inexpensive, sensitive, and reliable neuropsychological tests that are suitable for repeated measurements. The commonly used Mini-Mental-State-Examination fulfils only the first two requirements.
Methods: In the PROspective Study of Pravastatin in the Elderly at Risk (PROSPER), 5804 elderly subjects aged 70 to 82 years were examined using a learning test (memory), a coding test (general speed), and a short version of the Stroop test (attention). Data presented here were collected at dual baseline, before randomisation for active treatment.
Results: The tests proved to be reliable (with test/retest reliabilities ranging from acceptable (r=0.63) to high (r=0.88) and sensitive to detect small differences in subjects from different age categories. All tests showed significant practice effects: performance increased from the first measurement to the first follow up after two weeks.
Conclusion: Normative data are provided that can be used for one time neuropsychological testing as well as for assessing individual and group change. Methods for analysing cognitive change are proposed.







