title: [Functional capacity in the elderly: analyzing questions on mobility and basic and instrumental activities of daily living using Item Response Theory].
abstract: This article aims to evaluate the items used to measure functional capacity in the 2010 Health Survey in Greater Metropolitan Belo Horizonte, Minas Gerais State, Brazil, using Item Response Theory. We analyzed the scale's dimensionality, the items' position and discriminatory power, and the precision of the functional capacity estimate. The study was based on a sample of 2,174 individuals aged 60 to 99 years, 61% of whom were women, with a median of 4 years of schooling. The instrument with 21 items (4 response options) showed a Cronbach's alpha coefficient of 0.98. Factor analysis identified one factor that explained 92% of the variability between the items. The results indicated: (i) redundancy in items; (ii) precise estimation of functional capacity only for elderly below the median on the scale; and (iii) inability of the elderly to differentiate between response options. The analysis suggests the need to discuss items included in the instrument in order to cover a wider range of the scale and seek more appropriate response options.
authors.affiliation: Departamento de Estatística, Universidade Federal de Minas Gerais, Belo Horizonte, Brasil.
authors.forename: Cibele Comini
authors.initials: CC
authors.lastname: César
authors.affiliation: Fundação Oswaldo Cruz, Universidade Federal de Minas Gerais, Belo Horizonte, Brasil.
authors.forename: Juliana Vaz de Melo
authors.initials: JV
authors.lastname: Mambrini
authors.affiliation: Universidade Federal de Minas Gerais, Belo Horizonte.
authors.forename: Fabiane Ribeiro
authors.initials: FR
authors.lastname: Ferreira
authors.affiliation: Fundação Oswaldo Cruz, Universidade Federal de Minas Gerais, Belo Horizonte, Brasil.
authors.forename: Maria Fernanda
authors.initials: MF
authors.lastname: Lima-Costa
mesh_terms: D000203:Activities of Daily Living; D000368:Aged; D000369:Aged, 80 and over; D001938:Brazil; D004185:Disability Evaluation; D006233:Persons with Disabilities; D005260:Female; D016330:Frail Elderly; D015577:Geriatric Assessment / Q000379:methods*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011795:Surveys and Questionnaires; D014505:Urban Population