title: [Validating the Spanish version of the Nursing Activities Score].
abstract: BACKGROUND
  Validating workload scores ensures that they are appropriate for the purpose for which they were developed.
  
  
  OBJECTIVE
  To validate the Nursing Activities Score (NAS) Spanish version.
  
  
  METHODS
  Observational and prospective study. 1,045 patients who were admitted to a medical-surgical unit and a serious burns unit in 2006 were included. The nurse in charge assessed patient workloads by Nine Equivalent of Nursing Manpower use Score and NAS. To assess the internal consistency of the measurements of NAS, item-test correlations, Cronbach's α and Cronbach's α corrected by omitting each of the items were calculated. The intraobserver and interobserver reliability were assessed with the intraclass correlation coefficient by viewing recordings and Kappa (interobserver reliability) was estimated. For the analysis of internal validity, a factorial principal components analysis was performed. Convergent validity was assessed using the Spearman correlation coefficient values obtained from the Nine Equivalent of Nursing Manpower use Score and Spanish-NAS scales.
  
  
  RESULTS
  For internal consistency, 164 questionnaires were analysed and a Cronbach's α of 0.373 was calculated. The intraclass correlation coefficient for intraobserver reliability estimate was 0.837 (95% IC: 0.466-0.950) and 0.662 (95% IC: 0.033-0.882) for interobserver reliability. The estimated kappa was 0.371. For internal validity, exploratory factor analysis showed that the first item explained 58.9% of the variance of the questionnaire. For convergent validity 1006 questionnaires were included and a Spearman correlation coefficient of 0.746 was observed.
  
  
  CONCLUSIONS
  The psychometric properties of Spanish-NAS are acceptable.
authors: Servicio de Cuidados Intensivos, Hospital Universitario de Getafe, Getafe, Madrid, España.
authors: M M
authors: MM
authors: Sánchez-Sánchez
authors: Servicio de Cuidados Intensivos, Hospital Universitario de Getafe, Getafe, Madrid, España; CIBER Enfermedades Respiratorias, Instituto de Salud Carlos III, Madrid, España. Electronic address: susana.arias@salud.madrid.org.
authors: S
authors: S
authors: Arias-Rivera
authors: Servicio de Cuidados Intensivos, Hospital Universitario de Getafe, Getafe, Madrid, España.
authors: M P
authors: MP
authors: Fraile-Gamo
authors: Universidad Europea de Madrid, Villaviciosa de Odón, Madrid, España.
authors: I J
authors: IJ
authors: Thuissard-Vasallo
authors: Servicio de Cuidados Intensivos, Hospital Universitario de Getafe, Getafe, Madrid, España; CIBER Enfermedades Respiratorias, Instituto de Salud Carlos III, Madrid, España.
authors: F
authors: F
authors: Frutos-Vivar
mesh_terms: D005260:Female; D006801:Humans; D007802:Language; D008297:Male; D008875:Middle Aged; D009729:Nursing; D011446:Prospective Studies; D011594:Psychometrics; D015203:Reproducibility of Results; D057566:Self Report; D016526:Workload / Q000706:statistics & numerical data*
keywords: Cargas de trabajo; Critical care; Cuidados intensivos; Nine Equivalent of Nursing Manpower Score; Nine Equivalent of Nursing Manpower use Score; Nursing Activities Score; Propiedades psicométricas; Psychometric properties; Validación; Validation; Workloads