title: Factor analysis of an instrument to measure the impact of disease on daily life.
abstract: OBJECTIVE
  to verify the structure of factors of an instrument to measure the Heart Valve Disease Impact on Daily Life (IDCV) when applied to coronary artery disease patients.
  
  
  METHODS
  the study included 153 coronary artery disease patients undergoing outpatient follow-up care. The IDCV structure of factors was initially assessed by means of confirmatory factor analysis and, subsequently, by exploratory factor analysis. The Varimax rotation method was used to estimate the main components of analysis, eigenvalues greater than one for extraction of factors, and factor loading greater than 0.40 for selection of items. Internal consistency was estimated using Cronbach's alpha coefficient.
  
  
  RESULTS
  confirmatory factor analysis did not confirm the original structure of factors of the IDCV. Exploratory factor analysis showed three dimensions, which together explained 78% of the measurement variance.
  
  
  CONCLUSIONS
  future studies with expansion of case selection are necessary to confirm the IDCV new structure of factors.
authors: Universidade Estadual de Campinas, Faculdade de Enfermagem. Campinas-SP, Brasil.
authors: Rafaela Batista Dos Santos
authors: RB
authors: Pedrosa
authors: Universidade Estadual de Campinas, Faculdade de Enfermagem. Campinas-SP, Brasil.
authors: Roberta Cunha Matheus
authors: RC
authors: Rodrigues
authors: Universidade Estadual de Campinas, Centro de Atenção Integral à Saúde da Mulher, Divisão de Enfermagem. Campinas-SP, Brasil.
authors: Kátia Melissa
authors: KM
authors: Padilha
authors: Université Laval, Faculté des Sciences Infirmières, Chercheure, Centre de Recherche de l'Institut Universitaire de Cardiologie et de Pneumologie de Québec. Quebec City, Canada.
authors: Maria Cecília Bueno Jayme
authors: MC
authors: Gallani
authors: Universidade Estadual de Campinas, Faculdade de Enfermagem. Campinas-SP, Brasil.
authors: Neusa Maria Costa
authors: NM
authors: Alexandre
mesh_terms: D003324:Coronary Artery Disease / Q000175:diagnosis; D003430:Cross-Sectional Studies; D005163:Factor Analysis, Statistical; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D018434:Sickness Impact Profile