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MacArthur Foundation","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100000870","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["link.springer.com"],"crossmark-restriction":false},"short-container-title":["GeroScience"],"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>\n                    Frailty is an established benchmark of aging-related decline, yet most measures of frailty focus on physical decline. Increasing evidence that social environments influence trajectories of aging has led to growing interest in social frailty. Recently, a 10-item Social Frailty Index (SFI-10) was developed using data from the Health and Retirement Study (HRS) that used 8 social items plus chronological age and sex to predict mortality. This study evaluates the validity of the SFI-10, providing considerations for social frailty measurement. Utilizing HRS cohorts (\n                    <jats:italic>n<\/jats:italic>\n                    \u2009=\u20098264, ages 66 to 101) and cohorts from the Midlife in the United States (MIDUS) study (\n                    <jats:italic>n<\/jats:italic>\n                    \u2009=\u20095619, ages 40 to 75), the SFI-10 was evaluated alongside an index including only its social-environmental factors (SFI-8). Logistic regressions were used to predict mortality from the SFI-10, SFI-8, and only age and sex. Within MIDUS, the SFI-10, SFI-8, and age were further evaluated against external criteria relevant for social frailty. Findings indicate that chronological age is the most important predictor of mortality risk across both samples. Social-environmental factors predict mortality only marginally in older adults but more strongly in midlife. When associated with external criteria relevant for social frailty, the SFI-8 exhibited stronger criterion validity than the SFI-10. These findings suggest that social frailty may be best reflected by measures focusing exclusively on social behaviors and resources, excluding demographic characteristics. Our work underscores the need for well-designed measures of social frailty.\n                  <\/jats:p>","DOI":"10.1007\/s11357-026-02183-1","type":"journal-article","created":{"date-parts":[[2026,3,24]],"date-time":"2026-03-24T06:48:48Z","timestamp":1774334928000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Revisiting the social frailty index in aging adults: relevance\u00a0and implications for an emerging construct"],"prefix":"10.1007","author":[{"ORCID":"https:\/\/orcid.org\/0009-0009-5757-8376","authenticated-orcid":false,"given":"Charles W.","family":"Collinge","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6439-8829","authenticated-orcid":false,"given":"Alessandro","family":"Bartolomucci","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8662-8151","authenticated-orcid":false,"given":"Monica","family":"Luciana","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2026,3,24]]},"reference":[{"issue":"9868","key":"2183_CR1","doi-asserted-by":"publisher","first-page":"752","DOI":"10.1016\/S0140-6736(12)62167-9","volume":"381","author":"A Clegg","year":"2013","unstructured":"Clegg A, Young J, Iliffe S, Rikkert MO, Rockwood K. 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