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The main objectives of this study are: (1) to assess the prevalence of co-residential caregiving provided by individuals aged 50+; (2) to analyze differences between the group of Portuguese co-residential caregivers and the group of Portuguese non-caregivers; (3) to examine the longitudinal effect of providing informal care on the health of co-residential informal caregivers in Portugal.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Data from wave 4 and wave 6 of the Survey of Health Ageing and Retirement in Europe (SHARE) were used. A linear mixed model and a generalized mixed model were used to analyze the longitudinal effect of providing informal care on the health (physical health and depressive symptoms) of Portuguese individuals aged 50\u2009+\u2009.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>In both SHARE waves analyzed, Portugal had the highest percentage of co-residential caregivers aged 50+. At baseline, the Portuguese co-residential caregiver population, compared to non-caregivers, has a lower percentage of employed individuals (14.9% compared to 25.7%) and a higher percentage of individuals with four or more depressive symptoms (56.4% compared to 35.5%). The caregivers also have a lower quality of life (CASP-12) (30.93 compared to 32.59). Marginal differences in educational levels between the caregiver and non-caregiver groups were also found, with co-residential caregivers having lower levels of education (72.3% have ISCED 0\u20132 compared to 64.7%), lower levels of cognitive function (\u2212\u20092.321 compared to \u2212\u20091.784), lower levels of physical health (\u2212\u20090.180 compared to \u2212\u20090.076) and lower engagement in moderate or vigorous physical activity (14.9% compared to 21.5%). Longitudinal models reveal that providing care within the household is not associated with physical health (b\u2009=\u20090.048; se\u2009=\u20090.035;<jats:italic>p<\/jats:italic>\u2009=\u20090.167), but<jats:italic>is<\/jats:italic>associated with depressive symptoms (OR\u2009=\u20091.609; 95% CI\u2009=\u20091.141\u20132.271;<jats:italic>p<\/jats:italic>\u2009=\u2009&lt;\u20090.010).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Portugal has the highest percentage of co-residential caregivers aged 50+. In that country, providing informal care to a household member is associated with depressive symptoms. Portuguese policymakers should therefore promote programs to prevent and alleviate the depressive symptoms experienced by individuals aged 50+, who provide co-residential care.<\/jats:p><\/jats:sec>","DOI":"10.1186\/s12877-020-01841-z","type":"journal-article","created":{"date-parts":[[2020,11,1]],"date-time":"2020-11-01T08:02:41Z","timestamp":1604217761000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":21,"title":["Health impact of providing informal care in Portugal"],"prefix":"10.1186","volume":"20","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7503-8730","authenticated-orcid":false,"given":"F\u00e1tima","family":"Barbosa","sequence":"first","affiliation":[]},{"given":"Gina","family":"Voss","sequence":"additional","affiliation":[]},{"given":"Alice","family":"Delerue Matos","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2020,11,1]]},"reference":[{"issue":"3","key":"1841_CR1","doi-asserted-by":"publisher","first-page":"330","DOI":"10.1093\/ageing\/afs196","volume":"42","author":"AR Hosseinpoor","year":"2013","unstructured":"Hosseinpoor AR, Bergen N, Chatterji S. 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The owner of the SHARE data is the \u201cSurvey of Health, Ageing and Retirement in Europe \u2013 European Research Infrastructure Consortium (SHARE-ERIC)\u201d. After registration, scientific researchers may use the data in the context of \u201cscientific-use files\u201d. The secondary analysis performed here did not undergo further ethical approval. More information about the ethical approval can be found on the SHARE project website ().","order":1,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval and consent to participate"}},{"value":"Not applicable.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent for publication"}},{"value":"The authors declare that they have no competing interest.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}}],"article-number":"440"}}