RT Journal Article T1 Factor structure and invariance of the 12-item general health questionnaire (GHQ-12) for a sample of people in situations of homelessness A1 Sánchez Moreno, Esteban A1 Corchado Castillo, Ana Isabel A1 De la Fuente Roldán, Iria Noa AB People in situations of homelessness (PSH) have high levels of psychological impairment. Few studies have analyse the suitability of the instruments used to measure these levels. The aim of this study was to analyse the factorial structure and invariance (sex, age, nationality and housing status) of the 12-item General Health Questionnaire (GHQ-12) for a sample of PSH (n = 603) living in the Community of Madrid (Spain). A quantitative study was designed using a survey that include the GHQ-12 and other health measures (self-assessed health and diagnosis of mental illness). A comparison of three models (unidimensional, two correlated latent factors and bi-factor) showed that the bi-factor model provided the best goodness-of-fit indicators. A latent structure was identified in which each item was loaded into a general factor measuring a single GHQ-12 factor. The number of latent factors and the structure of factorial loads for GHQ-12 items were similar between groups. The GHQ-12 can be used as a screening instrument rather than as an outcome measure in different clinical dimensions. It is an appropriate instrument for assessing psychological impairment among PSH regardless of sex, age, nationality or housing status. PB Taylor & Francis SN 1053-0789 YR 2024 FD 2024 LK https://hdl.handle.net/20.500.14352/107014 UL https://hdl.handle.net/20.500.14352/107014 LA eng NO Sánchez-Moreno, E., Corchado-Castillo, A. I., & de la Fuente-Roldán, I. N. (2024). Factor structure and invariance of the 12-item general health questionnaire (GHQ-12) for a sample of people in situations of homelessness. Journal of Social Distress and Homelessness, 34(2), 259–271. https://doi.org/10.1080/10530789.2024.2379164 NO This study has been funded by Red FACIAM, under the research agreement with reference code UCM PR 452-2020.Received 03 Oct 2023, Accepted 08 Jul 2024, Published online: 17 Jul 2024 NO Red FACIAM DS Docta Complutense RD 26 feb 2026