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Revista Facultad Nacional de Salud Pública
Print version ISSN 0120-386X
Abstract
ROJAS-GUALDRON, Diego Fernando et al. Rasch analysis of the Katz index of independence in activities of daily living in senior citizens from Antioquia, Colombia. Rev. Fac. Nac. Salud Pública [online]. 2019, vol.37, n.2, pp.89-95. ISSN 0120-386X. https://doi.org/10.17533/udea.rfnsp.v37n2a10.
Improving Katz index interpretability contributes to a better understanding of its results facilitating decision making and intervention planning.
Objective:
To evaluate the validity of the Katz geriatric scale in senior citizens from a Rasch model perspective.
Methodology:
Secondary data analysis of a population-based, cross-sectional study of health status in 4,023 senior citizens conducted in Antioquia, Colombia, in 2012. Item fit, differential item functioning, unidimensionality, reliability and item-person map analyses were performed.
Results:
All items adjusted to the model. Transferring and Continence showed high differential item functioning with a considerable, but statistically non-significant impact on the overall estimation. Person and Item reliability were 0.80 and 0.90 respectively. The Rasch measurement explained 61.6% of variance.
Conclusion:
A unidimensional interval level measure can be obtained from the Katz instrument. It is important to do more research on differential functioning of Katz’s items in a way in which validity arguments on its generalization to various subpopulations could be strengthened and score interpretability could be improved.
Keywords : Aged; Aged; 80 and over; Activities of daily living; Validation studies.
