Happiness, quality of life and their determinants among people with systemic sclerosis: a structural equation modelling approach

Abstract Background Patients’ objectives and experiences must be core to the study and management of chronic diseases, such as SSc. Although patient-reported outcomes are attracting increasing attention, evaluation of the impact of disease on the overall subjective well-being, equivalent to ‘happiness’, is remarkably lacking. Objectives To examine the determinants of happiness and quality of life in patients with SSc, with emphasis on disease features and personality traits. Methods Observational, cross-sectional multicentre study, including 142 patients, with complete data regarding disease activity, disease impact, personality, health-related quality of life (HR-QoL) and happiness. Structural equation modelling was used to evaluate the association between the variables. Results The results indicated an acceptable fit of the model to the data. Perceived disease impact had a significant negative direct relation with HR-QoL (β = −0.79, P