{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,15]],"date-time":"2026-10-15T20:34:53Z","timestamp":1792096493987,"version":"4.4.0"},"reference-count":40,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2026,1,7]],"date-time":"2026-01-07T00:00:00Z","timestamp":1767744000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["frontierspartnerships.org"],"crossmark-restriction":true},"short-container-title":["Acta Biochim. Pol."],"abstract":"<jats:sec>\n                    <jats:title>Background<\/jats:title>\n                    <jats:p>Vitamin D deficiency is a major public health concern, worldwide yet data on the adult population in T\u00fcrkiye remain limited. This study aimed to determine the prevalence of vitamin D deficiency and its associated risk factors in Tokat Province, T\u00fcrkiye.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>A population based cross-sectional study was conducted among 2,225 adults aged \u226520\u00a0years through multistage stratified cluster sampling from both urban and rural areas. Data were obtained via structured questionnaires, anthropometric measurements, and fasting blood samples. Serum 25-hydroxyvitamin D3 [25(OH)D3] levels were measured and categorized as deficient (&amp;lt;10\u00a0ng\/mL), insufficient (10\u201320\u00a0ng\/mL), or sufficient (&amp;gt;20\u00a0ng\/mL). Multivariate logistic regression was used to identify predictors of deficiency.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>The mean age was 47.2 \u00b1 15.2\u00a0years, and 54.8% were women. Vitamin D deficiency was present in 38.7% and insufficiency in 46.4% of participants. Deficiency was significantly more common among women, the older adult, obese individuals, and those with lower education levels and chronic diseases (p &amp;lt; 0.05). In the adjusted model female sex (aOR 0.19, 95% CI 0.14\u20130.27), obesity (aOR 1.76, 95% CI 1.36\u20132.28), and lower education were independent predictors of deficiency.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>Vitamin D deficiency and insufficiency are highly prevalent among adults in Tokat Province, despite adequate sunlight exposure in the region. Public health strategies\/interventions should focus on high-risk groups, prioritize particularly women, older adults, and obese individuals through screening, education, and targeted supplementation.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.3389\/abp.2025.15459","type":"journal-article","created":{"date-parts":[[2026,1,7]],"date-time":"2026-01-07T06:10:06Z","timestamp":1767766206000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":2,"title":["Prevalence of vitamin D deficiency and related factors among adults in Tokat province, T\u00fcrkiye: a community-based cross-sectional study"],"prefix":"10.3389","volume":"72","author":[{"given":"Muzaffer","family":"Katar","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"R\u0131za","family":"\u00c7\u0131t\u0131l","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yal\u00e7\u0131n","family":"\u00d6nder","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Osman","family":"Demir","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2026,1,7]]},"reference":[{"key":"B1","doi-asserted-by":"publisher","first-page":"173","DOI":"10.1007\/BF03343702","article-title":"Sunlight exposure and vitamin D deficiency in Turkish women","volume":"23","author":"Alag\u00f6l","year":"2000","journal-title":"J. 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