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Impact of Work Environment Absent of Natural Light on Vitamin D Levels

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT01385085
Recruitment Status : Unknown
Verified June 2011 by Medical Corps, Israel Defense Force.
Recruitment status was:  Not yet recruiting
First Posted : June 29, 2011
Last Update Posted : June 29, 2011
Information provided by:
Medical Corps, Israel Defense Force

Brief Summary:

Three types of workers exposed to different levels of natural sunlight will be tested for Vitamin D blood level, PTH, Ca, P, albumin and alkaline phosphatase.

In addition, each tested worker will be asked to fill a questionnaire for demographic, medical and personal habit information.

Condition or disease
Vitamin D Deficiency

Study Type : Observational
Estimated Enrollment : 300 participants
Observational Model: Case-Crossover
Time Perspective: Cross-Sectional
Official Title: Impact of Work Environment Absent of Natural Light on Vitamin D Levels
Study Start Date : November 2011

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Vitamin D
Drug Information available for: Vitamin D
U.S. FDA Resources

No natural sunlight
one group works in a basement with no natural sunlight
Low level of Natural Sunlight
the second group work in offices with unopenable windows.
High level of Natural Sunlight
The third group works outdoors.

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years to 45 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes
Sampling Method:   Probability Sample
Study Population
People employed in three types of natural sunlight exposure.

Inclusion Criteria:

  • people employed in their current work place at least 6 months,

Exclusion Criteria:

  • people who consume food additives containing Vitamin D.
  • people who have a chronic illness which harms the Vitamin D absorption, such as Celiac, chronic Pancreatitis, Cystic Fibrosis and IBS.
  • people who have a chronic illness which harms Vitamin D metabolism, such as chronic hepatitis, kidney insufficiency and Nephrotic Syndrome.
  • pregnant women.
  • people who require prescribed medicine like steroids, anti-convulsion, and HIV treatments.

Responsible Party: Head of Industrial Hygiene, Occupational Medicine and Medical Classification Branch , IDF Identifier: NCT01385085     History of Changes
Other Study ID Numbers: 922-2010-IDF-CTIL
First Posted: June 29, 2011    Key Record Dates
Last Update Posted: June 29, 2011
Last Verified: June 2011

Keywords provided by Medical Corps, Israel Defense Force:
Vitamin D

Additional relevant MeSH terms:
Vitamin D Deficiency
Deficiency Diseases
Nutrition Disorders
Vitamin D
Growth Substances
Physiological Effects of Drugs
Bone Density Conservation Agents