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The purpose of this study was to analyze factors related to unmet healthcare needs among South Korean adults.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>We used a retrospective cross-sectional study design. This nationwide-based study included the data of 26,598 participants aged 19\u00a0years and older, which were obtained from the 2013\u20132017 Korea National Health and Nutrition Examination Surveys. Using multiple logistic regression models, we analyzed the associations between factors that influence unmet healthcare needs and participants\u2019 subgroups.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Despite South Korea\u2019s universal health insurance system, in 2017, 9.5% of South Koreans experienced unmet healthcare needs. In both the male and female groups, younger people (age 19\u201339) had a higher odds ratio (OR) of experiencing unmet healthcare needs compared to older people (reference: age\u2009\u2265\u200960) (men: OR 1.83, 95% confidence interval [CI]\u2009=\u20091.35\u20132.48; women: OR 1.42, 95% CI 1.12\u20131.81). In particular, unlike men, women\u2019s unmet healthcare needs increased as their incomes decreased (1 quartile OR 1.55, 2 quartiles OR 1.29, 3 quartiles OR 1.26). Men and women showed a tendency to have more unmet healthcare needs with less exercise, worse subjective health state, worse pain, and a higher degree of depression.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>The contributing factors of unmet healthcare needs included having a low socioeconomic status, high stress, severe pain, and severe depression. Considering our findings, we suggest improving healthcare access for those with low socioeconomic status.<\/jats:p><\/jats:sec>","DOI":"10.1186\/s12955-021-01737-5","type":"journal-article","created":{"date-parts":[[2021,3,20]],"date-time":"2021-03-20T18:02:41Z","timestamp":1616263361000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":48,"title":["Determining the reasons for unmet healthcare needs in South Korea: a secondary data analysis"],"prefix":"10.1186","volume":"19","author":[{"given":"Boyoung","family":"Jung","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5020-6723","authenticated-orcid":false,"given":"In-Hyuk","family":"Ha","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2021,3,20]]},"reference":[{"issue":"4","key":"1737_CR1","doi-asserted-by":"publisher","first-page":"256","DOI":"10.1136\/jme.27.4.256","volume":"27","author":"N Rice","year":"2001","unstructured":"Rice N, Smith PC. 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