Abstract

Introduction: Perceived social support is a relevant variable in health-disease processes. Measurement of this construct must be reliable and valid; thus, we aimed to determine the psychometric properties of the ESSI in the Chilean population and whether this measure is invariant between men and women and between university students and adults. Method: Two non-probabilistic samples (students; n = 538, and adults; n = 446) were enrolled in a cross-sectional study. Data were analyzed with a Multigroup Confirmatory Factor Analysis and reliability with McDonald's Omega coefficient (w). Results: A unidimensional structure of the ESSI was confirmed in the entire sample. Likewise, we proved scalar invariance between men and women and partial scalar invariance between university students and adults. The reliability of the ESSI scores was adequate (w > .80). Conclusion: The ESSI scores present evidence of factorial validity and reliability in the Chilean population. The scale can be used to measure perceived social support, although its differentiated use between university students and adults is recommended.