{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,28]],"date-time":"2026-08-28T05:19:00Z","timestamp":1787894340510,"version":"build-2784847793"},"reference-count":22,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2026,8,28]],"date-time":"2026-08-28T00:00:00Z","timestamp":1787875200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Nutr."],"abstract":"<jats:p>\n                    Vitamin D deficiency is common among healthcare workers owing to indoor work, shift patterns, and limited sunlight, even in Mediterranean countries, yet evidence for hospital porters is scarce. This single-center, cross-sectional study assessed serum 25-hydroxyvitamin D [25(OH)D] concentrations and their unadjusted associations with psychological well being and presenteeism among hospital porters in a Greek tertiary university hospital in Alexandroupolis, Northern Greece, between March and June 2026. Of 46 eligible porters, 42 participated (91.3%). Serum 25(OH)D was measured by electrochemiluminescence immunoassay (ECLIA). Participants completed validated Greek versions of the WHO-5 Well Being Index and the Stanford Presenteeism Scale (SPS-6). Demographic, occupational, lifestyle, and clinical data, including BMI, were obtained from occupational-health records. The median 25(OH)D was 18.7\u202fng\/mL (IQR 14.3\u201326.0), with 59.5% classified as deficient; mean BMI was 26.7\u202f\u00b1\u202f3.7\u202fkg\/m\n                    <jats:sup>2<\/jats:sup>\n                    . In unadjusted analyses, 25(OH)D correlated positively with WHO-5 (rho\u202f=\u202f0.371,\n                    <jats:italic>p<\/jats:italic>\n                    \u202f=\u202f0.015) but not SPS-6, and inversely with BMI (rho\u202f=\u202f\u22120.465,\n                    <jats:italic>p<\/jats:italic>\n                    \u202f=\u202f0.002). Surgical porters had lower 25(OH)D (\n                    <jats:italic>p<\/jats:italic>\n                    \u202f=\u202f0.025) but higher BMI (\n                    <jats:italic>p<\/jats:italic>\n                    \u202f=\u202f0.029) than general ward porters. Because no multivariable adjustment was possible and residual confounding cannot be excluded, these associations are exploratory and hypothesis-generating. These findings highlight the need for longitudinal research in this understudied workforce.\n                  <\/jats:p>","DOI":"10.3389\/fnut.2026.1920952","type":"journal-article","created":{"date-parts":[[2026,8,28]],"date-time":"2026-08-28T04:34:49Z","timestamp":1787891689000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Serum 25-hydroxyvitamin D concentrations, well being, and presenteeism among hospital porters: a single-center cross-sectional study in Greece"],"prefix":"10.3389","volume":"13","author":[{"given":"Elena","family":"Vasileiou","sequence":"first","affiliation":[{"name":"Laboratory of Hygiene and Environmental Protection, Medical School, Democritus University of Thrace","place":["Alexandroupolis, Greece"]},{"name":"Department of Occupational Medicine, University General Hospital of Alexandroupolis","place":["Alexandroupolis, Greece"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Evangelia","family":"Nena","sequence":"additional","affiliation":[{"name":"Laboratory of Hygiene and Environmental Protection, Medical School, Democritus University of Thrace","place":["Alexandroupolis, Greece"]},{"name":"Department of Occupational Medicine, University General Hospital of Alexandroupolis","place":["Alexandroupolis, Greece"]},{"name":"Laboratory of Social Medicine, Medical School, Democritus University of Thrace","place":["Alexandroupolis, Greece"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Paschalis","family":"Ntolios","sequence":"additional","affiliation":[{"name":"Department of Nursing, Faculty of Health Sciences, Democritus University of Thrace","place":["Alexandroupolis, Greece"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Athanasios","family":"Zissimopoulos","sequence":"additional","affiliation":[{"name":"Medical School, Democritus University of Thrace","place":["Alexandroupolis, Greece"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Theodoros","family":"Constantinides","sequence":"additional","affiliation":[{"name":"Laboratory of Hygiene and Environmental Protection, Medical School, Democritus University of Thrace","place":["Alexandroupolis, Greece"]},{"name":"Department of Occupational Medicine, University General Hospital of Alexandroupolis","place":["Alexandroupolis, Greece"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2026,8,28]]},"reference":[{"key":"ref1","doi-asserted-by":"publisher","DOI":"10.3389\/fnut.2023.1070808","article-title":"Global and regional prevalence of vitamin D deficiency in population-based studies from 2000 to 2022: a pooled analysis of 7.9 million participants","volume":"10","author":"Cui","year":"2000","journal-title":"Front 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