[Assessment of participation in psychogeriatric day care]

Participants in psychogeriatric day care differ in their ability to enjoy the activities and to be engaged in the day care program. In order to reveal individual differences in the quality of participant engagement, an 18-item questionnaire was drafted and completed for 126 visitors of a psychogeriatric day care centre. Scalability of the items was tested according to criteria of nonparametric item response theory (IRT). Construct validity was determined by comparing the results with independent behaviour ratings of cognitive impairment and apathy, and scores on the Amsterdam Dementia Screening Test (ADS), a neuropsychological test of multiple cognitive domains. Nine items formed a strong primary Participation Scale with a coefficient H of 0.63. Behaviour ratings of cognitive impairment and apathy were significant predictors of the participation score. The same was true for the subtests Design Copying and Category Fluency of the ADS. Two meaningful small secondary scales were found, representing motivation and emotional stability, which add to the predominantly cognitive content of the primary scale. Total scores of the secondary scales correlated with affective parameters, but not with cognitive indices. The Participation Scale deserves to be expanded with items referring to motivation and emotional experience.