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NCT02136407 Clinical Trial

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

Vitamin-D Insufficiency Clinical Trial

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

Clinical Trial Details — Status: Completed

Administrative data
NCT number NCT02136407
Other study ID # EPN399-09
Secondary ID
Status Completed
Phase N/A
First received May 2, 2014
Last updated May 12, 2014
Start date October 2009
Est. completion date September 2010

Study information
Verified date May 2014
Source Sahlgrenska University Hospital, Sweden
Contact n/a
Is FDA regulated No
Health authority Sweden: Regional Ethical Review Board
Study type Observational

Clinical Trial 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.

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.

Recruitment information / eligibility
Status Completed
Enrollment 615
Est. completion date September 2010
Est. primary completion date September 2010
Accepts healthy volunteers Accepts Healthy Volunteers
Gender Both
Age group 16 Years to 75 Years
Eligibility Inclusion Criteria:

- healthy at the time of donating blood

Exclusion Criteria:

- unhealthy

Study Design

Observational Model: Cohort, Time Perspective: Cross-Sectional

Related Conditions & MeSH terms

Locations
Country Name City State
Sweden Sahlgrenska University Hospital Gothenburg

Sponsors (1)
Lead Sponsor Collaborator
Sahlgrenska University Hospital, Sweden

Country where clinical trial is conducted

Sweden, 

Outcome
Type Measure Description Time frame Safety issue
Primary Inter-individual and intra-individual varations in serum 25-hydroxy vitamin-D during different seasons. Group1:Blood donors, single test, 25(OH)vit D at inclusion . Group 2: thrombocyte donors: multiple tests, serum 25(OH)vit D during 8 months. No