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

May 12, 2014 updated by: Eva Klingberg, Sahlgrenska University Hospital, Sweden
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.

Study Overview

Status

Completed

Conditions

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.

Study Type

Observational

Enrollment (Actual)

615

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Sweden
      • Gothenburg, Sweden, 41345
        • Sahlgrenska University Hospital

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

16 years to 75 years (Child, Adult, Older Adult)

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

All

Sampling Method

Probability Sample

Study Population

Blood donors

Description

Inclusion Criteria:

  • healthy at the time of donating blood

Exclusion Criteria:

  • unhealthy

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

Cohorts and Interventions

Group / Cohort
Blood donors
N=540
Thrombocyte donors
N=75

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
Inter-individual and intra-individual varations in serum 25-hydroxy vitamin-D during different seasons.
Time Frame: 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.
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.

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sahlgrenska University Hospital, Sweden

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

October 1, 2009

Primary Completion (Actual)

September 1, 2010

Study Completion (Actual)

September 1, 2010

Study Registration Dates

First Submitted

May 2, 2014

First Submitted That Met QC Criteria

May 12, 2014

First Posted (Estimate)

May 13, 2014

Study Record Updates

Last Update Posted (Estimate)

May 13, 2014

Last Update Submitted That Met QC Criteria

May 12, 2014

Last Verified

May 1, 2014

More Information

Terms related to this study

Keywords

Other Study ID Numbers

  • EPN399-09

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

Clinical Trials on Vitamin-D Insufficiency

Search Similar Trials

Sponsors and Collaborators

Medical Conditions

Drug Interventions

CROs by country

CROs in Chile

Conditions

Rare Diseases

Drug Interventions

Dietary Supplements

Sponsor/Collaborators

Locations

3
Subscribe