title: Dimensional structure of the demand control support questionnaire: a Brazilian context.
abstract: According to Karasek, job strain results from an interaction between high demands and low decision latitude.
  
  
  OBJECTIVE
  To reassess the dimensional structure and evaluate the internal consistency of demand control support questionnaire (DCSQ), a shortened version of job content questionnaire that was not sufficiently evaluated in validation studies.
  
  
  METHODS
  The study investigated 825 workers who completed the DCSQ in Rio de Janeiro, Brazil; to 399 workers, the questionnaire was self-administered at a hospital (2004-2005), and 426 workers were interviewed at nine restaurants (2006-2007). Confirmatory factor analysis using structural equation models was used to test theoretical structure of dimensionality. Internal consistency was evaluated by composite reliability and convergent validity by average variance extracted.
  
  
  RESULTS
  Confirmatory factor analysis supported the instrument in three dimensions: demands, skill discretion and decision authority. The best fit model was achieved by removing social support at work and the item repetitive work (skill discretion). A cross-loading from learning new things on demands and an error measurement correlation between work fast and work intense were confirmed. Composite reliability was acceptable for all dimensions, except for demands (0.58), which also showed inadequate average variance extracted (0.32). This final model was confirmed in separate analyses according to work setting, but the loadings of demands were lower for restaurant workers.
  
  
  CONCLUSIONS
  Our results indicated that skill discretion and decision authority formed two distinct dimensions. Additionally, the item repetitive work should be removed, as well as one of the items work fast or work intense (demands). Future research is still required to confirm these findings.
authors: Clinical Epidemiology Laboratory, Evandro Chagas Clinical Research Institute, Oswaldo Cruz Foundation, Av. Brasil, 4365, Manguinhos, Rio de Janeiro, RJ, 21040-900, Brazil. yarahahr@ipec.fiocruz.br
authors: Yara Hahr Marques
authors: YH
authors: Hökerberg
authors: Odaleia Barbosa
authors: OB
authors: Aguiar
authors: Michael
authors: M
authors: Reichenheim
authors: Eduardo
authors: E
authors: Faerstein
authors: Joaquim Gonçalves
authors: JG
authors: Valente
authors: Maria de Jesus
authors: Mde J
authors: Fonseca
authors: Sonia Regina Lambert
authors: SR
authors: Passos
mesh_terms: D000328:Adult; D001938:Brazil; D003430:Cross-Sectional Studies; D005163:Factor Analysis, Statistical; D005260:Female; D005522:Food Services; D006801:Humans; D007588:Job Satisfaction; D008297:Male; D008875:Middle Aged; D010564:Personnel, Hospital; D017009:Professional Autonomy; D011594:Psychometrics; D012944:Social Support; D013315:Stress, Psychological / Q000209:etiology; D011795:Surveys and Questionnaires / Q000592:standards*; D017132:Workplace / Q000523:psychology*