An Application of Structural Equation Modeling of Test Dispositional Optimism as Mediator or Moderator in Quality of Life in Patients with Chronic Disease

  • Estela Vilhena
  • José Luís Pais Ribeiro
  • Isabel Silva
  • Luísa Pedro
  • Rute Meneses
  • Helena Cardoso
  • António Martins da Silva
  • Denisa Mendonça
Part of the Studies in Theoretical and Applied Statistics book series (STAS)


The aim of the present study was to test a hypothetical model to examine if dispositional optimism exerts a moderating or a mediating effect between personality traits and quality of life, in Portuguese patients with chronic diseases. A sample of 540 patients was recruited from central hospitals in various districts of Portugal. All patients completed self-reported questionnaires assessing socio-demographic and clinical variables, personality, dispositional optimism, and quality of life. Structural equation modeling (SEM) was used to analyze the moderating and mediating effects. Results suggest that dispositional optimism exerts a mediator rather than a moderator role between personality traits and quality of life, suggesting that “the expectation that good things will happen” contributes to a better general well-being and better mental functioning.


Personality Trait Structural Equation Modeling Dispositional Optimism General Mental Health Psychological Component 
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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Estela Vilhena
    • 1
  • José Luís Pais Ribeiro
    • 2
  • Isabel Silva
    • 3
  • Luísa Pedro
    • 4
  • Rute Meneses
    • 3
  • Helena Cardoso
    • 5
  • António Martins da Silva
    • 5
  • Denisa Mendonça
    • 5
  1. 1.Polytechnic Institute of Cávado and Ave and ICBAS University of PortoPortoPortugal
  2. 2.FPCE University of Porto and UIPESPortoPortugal
  3. 3.U.Fernando Pessoa of PortoPortoPortugal
  4. 4.IPL of LisbonLisbonPortugal
  5. 5.ICBAS University of Porto and HGSA Hospital Center of PortoPortoPortugal

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