An observational study in Vitamin D Deficiency, sponsored by First Affiliated Hospital of Zhejiang University. Enrolling by invitation at 2 sites in China. Per ClinicalTrials.gov, last updated 2026-10-08.
Sponsored by First Affiliated Hospital of Zhejiang University · Observational
Vitamin D deficiency is a global public health problem, with an estimated 1 billion people affected worldwide, and large-scale systematic data for Zhejiang Province remain scarce. This is a multicenter, retrospective cross-sectional study. The objectives are to: (1) assess the distribution of serum 25-hydroxyvitamin D [25(OH)D] levels across regions, seasons, and demographic groups in Zhejiang Province and estimate the prevalence of vitamin D deficiency (\<20 ng/mL) and insufficiency (20-29 ng/mL); (2) identify and quantify key determinants of vitamin D status, including environmental exposures (ultraviolet radiation, green coverage), lifestyle (outdoor activity, sun protection), dietary vitamin D intake, and individual characteristics; and (3) provide scientific evidence for targeted intervention strategies, public health policy, and clinical guidelines in Zhejiang Province.
773 studies on the registry are indexed under Vitamin D Deficiency; 61 are open to participants now.
This study's planned enrollment of 10,000 is above the median of 138 across 183 observational studies indexed under Vitamin D Deficiency.
Browse Vitamin D Deficiency studies →First Affiliated Hospital of Zhejiang University is the lead sponsor of 256 studies on the registry; 140 are open to participants now.
Counted across the registry records on this site, refreshed daily.
The study population comprises individuals who underwent serum 25-hydroxyvitamin D [25(OH)D] measurement at multiple hospitals in Zhejiang Province in 2025. The population includes healthy individuals undergoing routine health checkups as well as patients with various chronic diseases (including chronic kidney disease, diabetes, and autoimmune diseases), spanning all age groups.
Exclusion Criteria:
Patients who completed serum 25(OH)D measurement at participating hospitals in Zhejiang Province in 2025.
Serum 25-hydroxyvitamin D [25(OH)D] concentration
Serum 25-hydroxyvitamin D \[25(OH)D\] concentration, expressed in ng/mL. Measured from existing clinical laboratory results at each participating hospital.
Time frame: Time frame: Baseline (testing in 2025).
Plan to share: No
No publications or documents are linked to this record.
From the registry record's own update history. This site started tracking changes on Sep 25, 2026; for anything earlier, see the record history on ClinicalTrials.gov ↗
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First Affiliated Hospital of Zhejiang University