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

The recruitment status of this study is unknown because the information has not been verified recently.
Verified June 2011 by Medical Corps, Israel Defense Force.
Recruitment status was  Not yet recruiting
Information provided by:
Medical Corps, Israel Defense Force Identifier:
First received: June 28, 2011
Last updated: NA
Last verified: June 2011
History: No changes posted

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.

Vitamin D Deficiency

Study Type: Observational
Study Design: Observational Model: Case-Crossover
Time Perspective: Cross-Sectional
Official Title: Impact of Work Environment Absent of Natural Light on Vitamin D Levels

Resource links provided by NLM:

Further study details as provided by Medical Corps, Israel Defense Force:

Estimated Enrollment: 300
Study Start Date: November 2011
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.


Ages Eligible for Study:   18 Years to 45 Years
Genders Eligible for Study:   Both
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.
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

No Contacts or Locations Provided
  More Information

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 
Study First Received: June 28, 2011
Last Updated: June 28, 2011
Health Authority: Israel: Israeli Health Ministry Pharmaceutical Administration

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

Additional relevant MeSH terms:
Vitamin D Deficiency
Deficiency Diseases
Nutrition Disorders
Vitamin D
Bone Density Conservation Agents
Growth Substances
Pharmacologic Actions
Physiological Effects of Drugs
Vitamins processed this record on May 03, 2016