| Sumario: | To verify the factor structure of the LIFE-H 3.1-Brasil in a sample of independent older adults, and to analyze their responses to the instrument. Cross-sectional study with175 older adults assisted by the Family Health Strategy in the interior of the State of São Paulo/Brazil. We used Cronbach's alpha to assess internal consistency, Pearson's correlation coefficient for retained dimensions, and exploratory factor analysis to examine the factor structure. Among participants, 62.3 per cent were women, 49.2 per cent were aged between 60–69 years, 54.3 per cent had 0–3 years of schooling and 67.4 per cent were retired. Based on our factor analysis, four factors were identified that explained 43.5 per cent of the variance: personal care, community, recreation, and communication. Cronbach's alphas ranged from.76 to.93. We demonstrated that a 4-dimensional model for the LIFE-H 3.1-Brasil was valid and reliable to measure the quality of social participation of independents older adults living in the community. Findings support its use in clinical practice and research. Nonetheless, future research is warranted to confirm the proposed factorial structure. This study supports the importance of identifying older adults' social participation through a valid instrument such as the LIFE-H, which has been widely used internationally.
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