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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">avk</journal-id><journal-title-group><journal-title xml:lang="ru">Архивъ внутренней медицины</journal-title><trans-title-group xml:lang="en"><trans-title>The Russian Archives of Internal Medicine</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2226-6704</issn><issn pub-type="epub">2411-6564</issn><publisher><publisher-name>“SINAPS” LLC</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.20514/2226-6704-2024-14-4-276-283</article-id><article-id custom-type="edn" pub-id-type="custom">ULGLRC</article-id><article-id custom-type="elpub" pub-id-type="custom">avk-1823</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ОРИГИНАЛЬНЫЕ СТАТЬИ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>ORIGINAL ARTICLE</subject></subj-group></article-categories><title-group><article-title>Статус витамина D у жителей Российской Федерации, его возрастные особенности и взаимосвязь с уровнем паратиреоидного гормона</article-title><trans-title-group xml:lang="en"><trans-title>Vitamin D Status Among Residents of the Russian Federation and Its Relation with Age and Parathyroid Hormone</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-1673-698X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Мармалюк</surname><given-names>Д. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Marmalyuk</surname><given-names>D. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Мармалюк Дарья Александровна — Врач-ординатор кафедра эндокринологии № 1</p><p>Москва</p></bio><bio xml:lang="en"><p>Daria A. Marmalyuk — Resident Doctor, Department of Endocrinology No. 1, Federal State Autonomous Educational Institution of Higher Education</p><p>Moscow</p></bio><email xlink:type="simple">daralmar@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-2144-8595</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Рунова</surname><given-names>Г. Е.</given-names></name><name name-style="western" xml:lang="en"><surname>Runova</surname><given-names>G. E.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Рунова Гюзель Евгеньевна — к.м.н., доцент кафедры эндокринологии № 1</p><p>Москва</p></bio><bio xml:lang="en"><p>Gyuzel E. Runova — Candidate of Medical Sciences, Associate Professor of the Department of Endocrinology No. 1</p><p>Moscow</p></bio><email xlink:type="simple">guzelvolkova@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-8505-5526</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Глинкина</surname><given-names>И. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Glinkina</surname><given-names>I. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Глинкина Ирина Владимировна — к.м.н., доцент кафедры эндокринологии № 1</p><p>Москва</p></bio><bio xml:lang="en"><p>IrinaV. Glinkina — Candidate of Medical Sciences, Associate Professor of the Department of Endocrinology No. 1</p><p>Moscow</p></bio><email xlink:type="simple">irina_glinkina@rambler.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-3026-6315</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Фадеев</surname><given-names>В. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Fadeyev</surname><given-names>I. M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Фадеев Валентин Викторович — д.м.н., профессор, заведующий кафедрой эндокринологии № 1</p><p>Москва</p></bio><bio xml:lang="en"><p>Valentin V. Fadeyev — Doctor of Medical Sciences, Professor, Head of the Department of Endocrinology No. 1</p><p>Moscow</p></bio><email xlink:type="simple">walfad@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>ФГАОУ ВО Первый Московский государственный медицинский университет имени И.М. Сеченова Министерства здравоохранения Российской Федерации (Сеченовский Университет)</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Sechenov First Moscow State Medical University (Sechenov University)</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>31</day><month>07</month><year>2024</year></pub-date><volume>14</volume><issue>4</issue><fpage>276</fpage><lpage>283</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Мармалюк Д.А., Рунова Г.Е., Глинкина И.В., Фадеев В.В., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Мармалюк Д.А., Рунова Г.Е., Глинкина И.В., Фадеев В.В.</copyright-holder><copyright-holder xml:lang="en">Marmalyuk D.A., Runova G.E., Glinkina I.V., Fadeyev I.M.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://www.medarhive.ru/jour/article/view/1823">https://www.medarhive.ru/jour/article/view/1823</self-uri><abstract><p>Цель: оценить статус витамина D (25(ОН)D) в различных регионах Российской Федерации (РФ), а также установить взаимосвязь между уровнем 25(ОН)D, возрастом и уровнем паратиреоидного гормона (ПТГ).Материалы и методы: оценка статуса витамина D проводилась у жителей различных регионов РФ (Северно-Западного федерального округа (СЗФО), Центрального (ЦФО), Южного (ЮФО) и Дальневосточного (ДФО)) в период с 2012 по 2017 г. Всего в кросс-секционном исследовании проанализировано 115694 анонимных образцов, предоставленных независимой коммерческой лабораторией. Для определения уровня 25(ОН)D использовался хемилюминесцентный иммуноанализ.Результаты: Выявлена повсеместная распространенность низких уровней 25(ОН)D: дефицит (0,05). В летние месяцы медиана уровня витамина D оказалась выше, чем в зимние (25,3 нг/мл [18,3; 33,5] vs 24 нг/мл [16,7; 32,5], р=0,006). Уровень 25(ОН)D30 нг/мл) оказалось низким, что было сопоставимо с группой старше 80 лет (22,6 % и 18 %, соответственно, р=0,1). Подтверждена отрицательная обратная связь между уровнями витамина D и ПТГ (r=- 0,11, p=0,002). Выявлена слабая положительная корреляция между возрастом участников и уровнями ПТГ (r=0,18, p=0,000).Заключение: Полученные данные свидетельствуют о широкой распространенности низких уровней 25(ОН)D среди всех возрастных групп в РФ. Выявлены статистически значимые различия в статусе витамина D в зависимости от возраста и времени года. При этом географические факторы не оказали значимого влияния на уровни 25(ОН)D. Отмечена высокая распространенность выраженного дефицита витамина D у лиц младше 20 лет и старше 80 лет. Установлена слабая положительная корреляция между возрастом и уровнем ПТГ, что вместе с высокой частотой низких концентраций витамина D в старшей возрастной группе, требует адекватной своевременной коррекции данного состояния и дальнейшего динамического наблюдения, с целью предотвращения потенциальных негативных влияний дефицита витамина D на костную ткань.</p></abstract><trans-abstract xml:lang="en"><p>Objective: to study the vitamin D (25(OH)D) status in various regions of the Russian Federation (RF), and to determine the relation between age, levels of 25(OH)D and parathyroid hormone (PTH).Methods: The vitamin D status was investigated in residents of various regions of the Russian Federation (Northwestern Federal District, Central Federal District, Southern Federal District and Far Eastern Federal District) between 2012 and 2017. In this cross-sectional study 115694 anonymous samples were analyzed. All samples were provided by an independent commercial laboratory. Serum levels of vitamin D (25(OH)D) were measured using chemiluminescent assay.Results: The prevalence of low levels of 25(OH)D was widespread in the Russian Federation: deficiency (0,05). The median level of vitamin D was higher in the summertime than in the winter months (25,3 ng/ml [18,3; 33,5] vs 24 ng/ml [16,7; 32,5], p=0,006). Levels of 25(OH)D30 ng/ml) was low, which was comparable to the age group over 80 years (22,6 % and 18 %, respectively, p=0,1). A negative inverse correlation between vitamin D and PTH levels was confirmed (r=-0,11, p=0,002). There was a weak positive correlation between the age of participants and PTH levels (r=0,18, p=0,000).Conclusion: The obtained data indicate the high prevalence of 25(OH)D deficiency among all age groups in the Russian Federation. Vitamin D levels were statistically differed depending on age and season. Geographic factors did not have a significant impact on vitamin D status in different regions of the Russian Federation. The highest prevalence of severe D deficiency was observed in age group younger 20 years and over 80 years. A weak positive correlation was established between age and PTH levels. Considering the high frequency of low vitamin D concentrations in the elderly age group, this condition rеrequires adequate correction and further follow-up in order to prevent the negative effects of vitamin D deficiency on bones.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>витамин D</kwd><kwd>паратиреоидный гормон</kwd><kwd>статус витамина D</kwd><kwd>дефицит витамина D</kwd><kwd>распространенность</kwd><kwd>возраст</kwd></kwd-group><kwd-group xml:lang="en"><kwd>vitamin D</kwd><kwd>parathyroid hormone</kwd><kwd>vitamin D status</kwd><kwd>vitamin D deficiency</kwd><kwd>prevalence</kwd><kwd>age</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Holick MF. The vitamin D deficiency pandemic: Approaches for diagnosis, treatment and prevention. Rev EndocrMetabDisord. 2017;18(2):153-165. doi: 10.1007/s11154-017-9424-1</mixed-citation><mixed-citation xml:lang="en">Holick MF. The vitamin D deficiency pandemic: Approaches for diagnosis, treatment and prevention. Rev EndocrMetabDisord. 2017;18(2):153-165. doi: 10.1007/s11154-017-9424-1</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Spiro A, Buttriss JL. Vitamin D: An overview of vitamin D status and intake in Europe. Nutr Bull. 2014;39(4):322-350. doi: 10.1111/nbu.12108</mixed-citation><mixed-citation xml:lang="en">Spiro A, Buttriss JL. Vitamin D: An overview of vitamin D status and intake in Europe. Nutr Bull. 2014;39(4):322-350. doi: 10.1111/nbu.12108</mixed-citation></citation-alternatives></ref><ref id="cit3"><label>3</label><citation-alternatives><mixed-citation xml:lang="ru">Lips P, Cashman KD, Lamberg-Allardt C et al. Current vitamin D status in European and Middle East countries and strategies to prevent vitamin D deficiency: a position statement of the European Calcified Tissue Society. Eur J Endocrinol. 2019;180(4):P23-P54. doi: 10.1530/EJE-18-0736</mixed-citation><mixed-citation xml:lang="en">Lips P, Cashman KD, Lamberg-Allardt C et al. Current vitamin D status in European and Middle East countries and strategies to prevent vitamin D deficiency: a position statement of the European Calcified Tissue Society. Eur J Endocrinol. 2019;180(4):P23-P54. doi: 10.1530/EJE-18-0736</mixed-citation></citation-alternatives></ref><ref id="cit4"><label>4</label><citation-alternatives><mixed-citation xml:lang="ru">Cashman KD, Kiely M. Recommended dietary intakes for vitamin D: Where do they come from, what do they achieve and how can we meet them? J Hum Nutr Diet. 2014;27(5):434-442. doi: 10.1111/jhn.12226</mixed-citation><mixed-citation xml:lang="en">Cashman KD, Kiely M. Recommended dietary intakes for vitamin D: Where do they come from, what do they achieve and how can we meet them? J Hum Nutr Diet. 2014;27(5):434-442. doi: 10.1111/jhn.12226</mixed-citation></citation-alternatives></ref><ref id="cit5"><label>5</label><citation-alternatives><mixed-citation xml:lang="ru">Bassil D, Rahme M, Hoteit M et al. Hypovitaminosis D in the Middle East and North Africa: Prevalence, risk factors and impact on outcomes. Dermatoendocrinol. 2013;5(2):274-298. doi: 10.4161/derm.25111</mixed-citation><mixed-citation xml:lang="en">Bassil D, Rahme M, Hoteit M et al. Hypovitaminosis D in the Middle East and North Africa: Prevalence, risk factors and impact on outcomes. Dermatoendocrinol. 2013;5(2):274-298. doi: 10.4161/derm.25111</mixed-citation></citation-alternatives></ref><ref id="cit6"><label>6</label><citation-alternatives><mixed-citation xml:lang="ru">Minisola S, Colangelo L, Pepe J et al. Osteomalacia and Vitamin D Status: A Clinical Update 2020. JBMR Plus. 2020;5(1):e10447. doi: 10.1002/jbm4.10447</mixed-citation><mixed-citation xml:lang="en">Minisola S, Colangelo L, Pepe J et al. Osteomalacia and Vitamin D Status: A Clinical Update 2020. JBMR Plus. 2020;5(1):e10447. doi: 10.1002/jbm4.10447</mixed-citation></citation-alternatives></ref><ref id="cit7"><label>7</label><citation-alternatives><mixed-citation xml:lang="ru">Cauley JA, Lacroix AZ, Wu L et al. Serum 25-hydroxyvitamin D concentrations and risk for hip fractures. AnnInternMed. 2008;149(4):242-250. doi: 10.7326/0003-4819-149-4-200808190-00005</mixed-citation><mixed-citation xml:lang="en">Cauley JA, Lacroix AZ, Wu L et al. Serum 25-hydroxyvitamin D concentrations and risk for hip fractures. AnnInternMed. 2008;149(4):242-250. doi: 10.7326/0003-4819-149-4-200808190-00005</mixed-citation></citation-alternatives></ref><ref id="cit8"><label>8</label><citation-alternatives><mixed-citation xml:lang="ru">Пигарова Е.А., Рожинская Л.Я., Катамадзе Н.Н. и др. Распространенность дефицита и недостаточности витамина D среди населения, проживающего в различных регионах Российской Федерации: результаты 1-го этапа многоцентрового поперечного рандомизированного исследования. Остеопороз и остеопатии. 2020; 23(4): 4-12. doi: 10.14341/osteo12701.</mixed-citation><mixed-citation xml:lang="en">Pigarova EA, Rozhinskaya LY, Katamadze NN et al. Prevalence of vitamin D deficiency in various regions of the Russian Federation: results of the first stage of the multicenter cross-sectional randomized study. Osteoporosis and bone diseases. 2020; 23(4): 4-12 doi: 10.14341/osteo12701 [in Russian].</mixed-citation></citation-alternatives></ref><ref id="cit9"><label>9</label><citation-alternatives><mixed-citation xml:lang="ru">Пигарова Е.А., Рожинская Л.Я., Белая Ж.Е. и др. Клинические рекомендации Российской ассоциации эндокринологов по диагностике, лечению и профилактике дефицита витамина D у взрослых. Проблемы эндокринологии. 2016; 62(4): 60-84. doi: 10.14341/probl201662460-84.</mixed-citation><mixed-citation xml:lang="en">Pigarova EA, Rozhinskaya LY, Belaya JE et al. Russian Association of Endocrinologists recommendations for diagnosis, treatment and prevention of vitamin D deficiency in adults. Problems of Endocrinology. 2016; 62(4): 60-84. doi: 10.14341/probl201662460-84 [in Russian].</mixed-citation></citation-alternatives></ref><ref id="cit10"><label>10</label><citation-alternatives><mixed-citation xml:lang="ru">Smirnova DV, Rehm CD, Fritz RD et al. Vitamin D status of the Russian adult population from 2013 to 2018. Sci Rep. 2022;12(1):16604. doi: 10.1038/s41598-022-21221-4</mixed-citation><mixed-citation xml:lang="en">Smirnova DV, Rehm CD, Fritz RD et al. Vitamin D status of the Russian adult population from 2013 to 2018. Sci Rep. 2022;12(1):16604. doi: 10.1038/s41598-022-21221-4</mixed-citation></citation-alternatives></ref><ref id="cit11"><label>11</label><citation-alternatives><mixed-citation xml:lang="ru">Агуреева О.В., Жабрева Т., Скворцова Е.А. и др. Анализ уровня витамина D в сыворотке крови пациентов в Ростовской области. Остеопороз и остеопатии. 2016; 19(2): 47-47. doi: 10.14341/osteo2016247-47.</mixed-citation><mixed-citation xml:lang="en">Agureeva OV, Zhabreva TO, Skvortsova EA, et al. Analiz urovnyavitamina D v syvorotke krovi patsientov v Rostovskoy oblasti. Osteoporosis and Bone Diseases. 2016; 19(2): 47. doi: 10.14341/osteo2016247-47 [in Russian].</mixed-citation></citation-alternatives></ref><ref id="cit12"><label>12</label><citation-alternatives><mixed-citation xml:lang="ru">Каронова Т.Л., Гринева Е.Н., Никитина И.Л. и др. Уровень обеспеченности витамином D жителей северо-западного региона РФ (г. Санкт-Петербург и г. Петрозаводск). Остеопороз и остеопатии. 2013; 16(3): 3-7. doi: 10.14341/osteo201333-7</mixed-citation><mixed-citation xml:lang="en">Karonova T.L., Grinyova E.N., Nikitina I.L. et al. The prevalence of vitamin D deficiency in the Northwestern region of the Russian Federation among the residents of St. Petersburg and Petrozavodsk. Osteoporosis and Bone Diseases. 2013; 16(3): 3-7. doi: 10.14341/osteo201333-7 [in Russian].</mixed-citation></citation-alternatives></ref><ref id="cit13"><label>13</label><citation-alternatives><mixed-citation xml:lang="ru">Спасич Т.А., Решетник Л.А., Жданова Е.Ю. и др. Целесообразная профилактика недостаточности витамина Д у населения Иркутской области. Acta Biomedica Scientifica. 2017; 2(5(2)): 43-48. doi: 10.12737/article_5a3a0d9f50b368.86841208.</mixed-citation><mixed-citation xml:lang="en">Spasich T.A., Reshetnik L.A., Zhdanova E.Y. et al. Appropriate prevention of vitamin D deficiency in the population of the Irkutsk region. Acta Biomedica Scientifica. 2017; 2(5(2)): 43-48. doi: 10.12737/article_5a3a0d9f50b368.86841208 [in Russian].</mixed-citation></citation-alternatives></ref><ref id="cit14"><label>14</label><citation-alternatives><mixed-citation xml:lang="ru">Суплотова Л.А., Авдеева В.А., Рожинская Л.Я. Статус витамина D у жителей Тюменского региона. Ожирение и метаболизм. 2019; 16(2): 69-74. doi: 10.14341/omet10162.</mixed-citation><mixed-citation xml:lang="en">СSuplotova L.A., Avdeeva V.A., Rozhinskaya L.Y. Vitamin D status in residents of Tyumen region. Obesity and metabolism. 2019; 16(2):69-74. doi: 10.14341/omet10162 [in Russian].</mixed-citation></citation-alternatives></ref><ref id="cit15"><label>15</label><citation-alternatives><mixed-citation xml:lang="ru">Melhus H, Snellman G, Gedeborg R et al. Plasma 25-hydroxyvitamin D levels and fracture risk in a community-based cohort of elderly men in Sweden. J Clin Endocrinol Metab. 2010;95(6):2637-2645. doi: 10.1210/jc.2009-2699</mixed-citation><mixed-citation xml:lang="en">Melhus H, Snellman G, Gedeborg R et al. Plasma 25-hydroxyvitamin D levels and fracture risk in a community-based cohort of elderly men in Sweden. J Clin Endocrinol Metab. 2010;95(6):2637-2645. doi: 10.1210/jc.2009-2699</mixed-citation></citation-alternatives></ref><ref id="cit16"><label>16</label><citation-alternatives><mixed-citation xml:lang="ru">Cashman KD, Dowling KG, Škrabáková Z et al. Standardizing serum 25-hydroxyvitamin D data from four Nordic population samples using the Vitamin D Standardization Program protocols: Shedding new light on vitamin D status in Nordic individuals. Scand J Clin Lab Invest. 2015;75(7):549-561. doi: 10.3109/00365513.2015.1057898</mixed-citation><mixed-citation xml:lang="en">Cashman KD, Dowling KG, Škrabáková Z et al. Standardizing serum 25-hydroxyvitamin D data from four Nordic population samples using the Vitamin D Standardization Program protocols: Shedding new light on vitamin D status in Nordic individuals. Scand J Clin Lab Invest. 2015;75(7):549-561. doi: 10.3109/00365513.2015.1057898</mixed-citation></citation-alternatives></ref><ref id="cit17"><label>17</label><citation-alternatives><mixed-citation xml:lang="ru">Коденцова В.М., Мендель О.И., Хотимченко С.А. и др. Физиологическая потребность и эффективные дозы витамина D для коррекции его дефицита. Современное состояние проблемы. Вопросы питания. 2017; 86(2): 47–62.</mixed-citation><mixed-citation xml:lang="en">Kodentsova V.M., Mendel’ O.I., Khotimchenko S.A. et al. Physiological needs and effective doses of vitamin D for deficiency correction. Current state of the problem. Problems of Nutrition. 2017; 86(2): 47–62. [in Russian].</mixed-citation></citation-alternatives></ref><ref id="cit18"><label>18</label><citation-alternatives><mixed-citation xml:lang="ru">Niedermaier T, Gredner T, Kuznia S, et al. Vitamin D food fortification in European countries: the underused potential to prevent cancer deaths. Eur J Epidemiol. 2022;37(4):309-320. doi: 10.1007/s10654-022-00867-4</mixed-citation><mixed-citation xml:lang="en">Niedermaier T, Gredner T, Kuznia S, et al. Vitamin D food fortification in European countries: the underused potential to prevent cancer deaths. Eur J Epidemiol. 2022;37(4):309-320. doi: 10.1007/s10654-022-00867-4</mixed-citation></citation-alternatives></ref><ref id="cit19"><label>19</label><citation-alternatives><mixed-citation xml:lang="ru">van der Wielen RP, Löwik MR, van den Berg H, et al. Serum vitamin D concentrations among elderly people in Europe. Lancet. 1995;346(8969):207-210. doi: 10.1016/s0140-6736(95)91266-5</mixed-citation><mixed-citation xml:lang="en">van der Wielen RP, Löwik MR, van den Berg H, et al. Serum vitamin D concentrations among elderly people in Europe. Lancet. 1995;346(8969):207-210. doi: 10.1016/s0140-6736(95)91266-5</mixed-citation></citation-alternatives></ref><ref id="cit20"><label>20</label><citation-alternatives><mixed-citation xml:lang="ru">Федеральная служба государственной статистики. Численность населения Российской Федерации по полу и возрасту [Электронный ресурс]. URL: https://rosstat.gov.ru/storage/mediabank/Bul_chislen_nasel-pv_01-01-2022.pdf. (дата обращения 14.11.2023).</mixed-citation><mixed-citation xml:lang="en">Federal’naya sluzhba gosudarstvennoi statistiki. Chislennost’ naseleniya Rossiiskoi Federatsii po polu i vozrastu [Electronic resource]. URL: https://rosstat.gov.ru/storage/mediabank/Bul_chislen_naselpv_01-01-2022.pdf (date of the application 14.11.2023) [In Russian].</mixed-citation></citation-alternatives></ref><ref id="cit21"><label>21</label><citation-alternatives><mixed-citation xml:lang="ru">Souberbielle JC, Brazier F, Piketty ML et. al. How the reference values for serum parathyroid hormone concentration are (or should be) established? J Endocrinol Invest. 2017;40(3):241-256. doi: 10.1007/s40618-016-0553-2</mixed-citation><mixed-citation xml:lang="en">Souberbielle JC, Brazier F, Piketty ML et. al. How the reference values for serum parathyroid hormone concentration are (or should be) established? J Endocrinol Invest. 2017;40(3):241-256. doi: 10.1007/s40618-016-0553-2</mixed-citation></citation-alternatives></ref><ref id="cit22"><label>22</label><citation-alternatives><mixed-citation xml:lang="ru">Touvier M, Deschasaux M, Montourcy M et al. Interpretation of plasma PTH concentrations according to 25OHD status, gender, age, weight status, and calcium intake: importance of the reference values. J Clin Endocrinol Metab. 2014;99(4):1196-1203. doi: 10.1210/jc.2013-3349</mixed-citation><mixed-citation xml:lang="en">Touvier M, Deschasaux M, Montourcy M et al. Interpretation of plasma PTH concentrations according to 25OHD status, gender, age, weight status, and calcium intake: importance of the reference values. J Clin Endocrinol Metab. 2014;99(4):1196-1203. doi: 10.1210/jc.2013-3349</mixed-citation></citation-alternatives></ref><ref id="cit23"><label>23</label><citation-alternatives><mixed-citation xml:lang="ru">Valcour A, Blocki F, Hawkins DM et al. Effects of age and serum 25-OH-vitamin D on serum parathyroid hormone levels. J Clin Endocrinol Metab. 2012;97(11):3989-3995. doi: 10.1210/jc.2012-2276</mixed-citation><mixed-citation xml:lang="en">Valcour A, Blocki F, Hawkins DM et al. Effects of age and serum 25-OH-vitamin D on serum parathyroid hormone levels. J Clin Endocrinol Metab. 2012;97(11):3989-3995. doi: 10.1210/jc.2012-2276</mixed-citation></citation-alternatives></ref><ref id="cit24"><label>24</label><citation-alternatives><mixed-citation xml:lang="ru">Chen X, Chu C, Doebis C et al. Vitamin D status and its association with parathyroid hormone in 23,134 outpatients. J Steroid Biochem Mol Biol. 2022; 220: 106101. doi: 10.1016/j.jsbmb.2022.106101</mixed-citation><mixed-citation xml:lang="en">Chen X, Chu C, Doebis C et al. Vitamin D status and its association with parathyroid hormone in 23,134 outpatients. J Steroid Biochem Mol Biol. 2022; 220: 106101. doi: 10.1016/j.jsbmb.2022.106101</mixed-citation></citation-alternatives></ref><ref id="cit25"><label>25</label><citation-alternatives><mixed-citation xml:lang="ru">Jiang Y, Liao L, Li J et al. Older Age Is Associated with Decreased Levels of VDR, CYP27B1, and CYP24A1 and Increased Levels of PTH in Human Parathyroid Glands. Int J Endocrinol. 2020; 2020: 7257913. doi: 10.1155/2020/7257913</mixed-citation><mixed-citation xml:lang="en">Jiang Y, Liao L, Li J et al. Older Age Is Associated with Decreased Levels of VDR, CYP27B1, and CYP24A1 and Increased Levels of PTH in Human Parathyroid Glands. Int J Endocrinol. 2020; 2020: 7257913. doi: 10.1155/2020/7257913</mixed-citation></citation-alternatives></ref></ref-list><fn-group><fn fn-type="conflict"><p>The authors declare that there are no conflicts of interest present.</p></fn></fn-group></back></article>
