NCT02136407

Seasonal Variations in Serum 25-hydroxy Vitamin-D Levels in a Swedish Cohort

• Status: Completed
• Phase: —
• Study type: Observational
• Enrollment: 615 (actual)
• Sponsor: Sahlgrenska University Hospital · Academic / Other
• Sex: All
• Age: 16 Years – 75 Years
• Healthy volunteers: Accepted

Summary

The purpose of this study was to study seasonal inter-individual and intra-individual variations in S-25(OH)D and to explore parameters associated with S-25-OHD in healthy Swedish adults.

Detailed description

Serum was collected during 12 months and analysed for 25(OH)D in 540 healthy blood donors. The blood donors answered questionnaires concerning vitamin D supplements, smoking, physical activity, sunbed use and holidays in sunny locations. Repeated serum samples were also collected from thrombocyte donors to study the intra-individual variations in S-25(OH)D.

Conditions

• Vitamin-D Insufficiency

Timeline

• Start date: 2009-10-01
• Primary completion: 2010-09-01
• Completion: 2010-09-01
• First posted: 2014-05-13
• Last updated: 2014-05-13

Locations

1 site across 1 country: Sweden