Construct validation and the Rasch model: functional ability of healthy elderly people.

Research output: Contribution to journalJournal articleResearchpeer-review

K Avlund, S Kreiner, K Schultz-Larsen

The purpose of this study was to test the construct validity of a measure of functional ability, developed with the intention of achieving a high degree of variability and capacity for discriminating among a group of healthy elderly people. Data were collected from 734 70-year-old people in Denmark in the county of Copenhagen. Functional ability was measured with the traditional activities of daily living and with a classification system developed specially for healthy elderly people. Construct validity was tested by the Rasch model for item analysis, addressing specifically the internal validity by assessing the homogeneity of items under different conditions. The results show that the proposed measure of functional ability is a combination of six different dimensions, divided into 3 types: mobility function, lower limb function and upper limb function. With regard to these three types decreased functional ability can appear by either tiredness or reduced speed.
Original languageEnglish
JournalScandinavian Journal of Public Health
Volume21
Issue number4
Pages (from-to)233-46
Number of pages13
ISSN1403-4948
Publication statusPublished - 1993

Bibliographical note

Keywords: Activities of Daily Living; Aged; Classification; Cohort Studies; Factor Analysis, Statistical; Female; Geriatric Assessment; Humans; Likelihood Functions; Male; Models, Statistical; Multivariate Analysis; Questionnaires; Reproducibility of Results; Sensitivity and Specificity

ID: 6339208