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The MDS Cognition Scale: a valid instrument for identifying and staging nursing home residents with dementia using
S L Hartmaier1, P D Sloane, H A Guess
1Department of Epidemiology, School of Public Health, University of North Carolina at Chapel Hill.
Objective:
We report the development and validation of an MDS-based cognitive index, the MDS Cognition Scale (MDS-COGS), by evaluating it against two popular dementia rating scales, the Global Deterioration Scale (GDS) and the Mini-Mental State Examination (MMSE).
Design:
A Cross-sectional study.
Participants:
Two hundred nursing home residents.
Measurements:
Each study participant was assessed on the GDS and the MMSE by trained medical students. At the same time, but independent of the medical students, a geriatric nurse completed the Minimum Data Set (MDS) instrument on each participant.
Main Results:
The Cognitive Performance Scale (CPS), a categorical measure of cognition that uses MDS items, was compared with the GDS in 133 subjects, using a split-sample technique. The GDS was found to be more appropriate as a 4-stage than a 7-stage scale, with GDS stages 1-4 acting as a single stage. The CPS showed very poor percent agreement with GDS stages 5 and 7 (50% or less) and, therefore, was revised by adding other MDS predictors. The new instrument, designated MDS-COGS, is a 0-10 point scale generated from eight MDS cognitive items. The MDS-COGS was then validated against the 4-stage GDS and MMSE in the remaining 67 nursing home residents. Chance-corrected agreement (kappa) between the MDS-COGS and GDS in the 67 subjects was 0.80 (95% CI = 0.70, 0.88), and percent agreement with GDS stages 5 and 7 was 60% and 85%, respectively. The MDS-COGS was also demonstrated to be a valid measure of cognitive impairment as defined by the MMSE, with sensitivity, specificity, chance-corrected agreement (kappa), and area under the ROC curve, all above 0.80.
Conclusions:
The MDS Cognition Scale, the MDS-COGS, provides a valid measure of the presence and severity of cognitive impairment in nursing home residents using items from the Minimum Data Set.
Insights
The new MDS Cognition Scale (MDS-COGS) accurately measures cognitive impairment in nursing home residents. This scale, derived from the Minimum Data Set (MDS), shows strong agreement with established dementia scales.
Area of Science:
- Gerontology
- Neuroscience
- Psychometrics
Background:
- Cognitive impairment is a significant concern in nursing home residents.
- Accurate assessment tools are crucial for timely diagnosis and intervention.
- Existing scales may have limitations in specific populations.
Purpose of the Study:
- To develop and validate the MDS Cognition Scale (MDS-COGS).
- To evaluate MDS-COGS against the Global Deterioration Scale (GDS) and Mini-Mental State Examination (MMSE).
- To establish MDS-COGS as a reliable measure for cognitive impairment in nursing home settings.
Main Methods:
- Cross-sectional study involving 200 nursing home residents.
- Assessment using the Global Deterioration Scale (GDS) and Mini-Mental State Examination (MMSE) by trained medical students.
- Geriatric nurse completion of the Minimum Data Set (MDS) instrument for each participant.
Main Results:
- Initial Cognitive Performance Scale (CPS) showed poor agreement with GDS stages 5 and 7.
- Revised scale, MDS-COGS, generated from eight MDS cognitive items, demonstrated strong validation.
- MDS-COGS showed high chance-corrected agreement (kappa=0.80) with GDS and excellent performance (sensitivity, specificity >0.80) against MMSE.
Conclusions:
- The MDS Cognition Scale (MDS-COGS) is a valid and reliable tool for assessing cognitive impairment.
- Utilizes readily available Minimum Data Set (MDS) items for comprehensive cognitive evaluation.
- Provides a valuable measure of cognitive impairment presence and severity in nursing home residents.