title: [Exploration and validation of working conditions questionnaire items included in the Spanish Household Survey on Alcohol and Drugs (EDADES)].
abstract: OBJECTIVE
  To identify and validate a factor structure from items on working conditions included in the 2007 edition of Spanish Household Survey on Alcohol and Drugs (EDADES-2007) for use in research on consumption of addictive substances with this survey.
  
  
  METHODS
  We performed a factor analysis of the questionnaire items using a cross-validation technique with a subsample of EDADES 2007 (N=13,005). Exploratory factor analysis with half of this sample yielded a latent factor structure. This structure was subsequently validated via confirmatory factor analysis with the remaining half of the sample. Standard criteria were used to test the model's goodness of fit, and a model-based internal consistency index was used to test the reliability of the structure.
  
  
  RESULTS
  The structure obtained showed an adequate confirmatory fit and involved four factors related to the dimensions environmental conditions (F1), workload (F2), precariousness (F3) and social support (F4). The internal consistency index confirmed the reliability for the total structure (0.755) as well as for each of the factors (F1=0.755, F2=0.661, F3=0.529 and F4=0.680).
  
  
  CONCLUSIONS
  The structure obtained represents a valid tool for assessing the relationship between use of addictive substances and certain work and employment conditions in the context of the EDADES survey. However, the inclusion of a more comprehensive and validated tool for the measurement of these conditions should be considered in future editions of the survey.
authors.affiliation: IMIM-Hospital del Mar, Barcelona, Spain.
authors.forename: Esther
authors.initials: E
authors.lastname: Colell
authors.forename: Albert
authors.initials: A
authors.lastname: Sánchez-Niubò
authors.forename: Fernando G
authors.initials: FG
authors.lastname: Benavides
authors.forename: Antònia
authors.initials: A
authors.lastname: Domingo-Salvany
mesh_terms: D000293:Adolescent; D000328:Adult; D000428:Alcohol Drinking; D005260:Female; D006306:Health Surveys; D006801:Humans; D008297:Male; D008875:Middle Aged; D016272:Occupational Health; D013030:Spain; D019966:Substance-Related Disorders; D011795:Surveys and Questionnaires; D055815:Young Adult