Vitamin D Supplementation in Conscripts

Status Completed

Clinical Trial Summary

A longitudinal, triple-blinded, randomized, placebo-controlled trial, with a 7-month follow-up period is conducted between October 2016 to April 2017.

Clinical Trial Description

Body mass (kg) and height (cm) is measured by the same person at the medical center using standardized equipment and the body mass index (BMI) is calculated in kg/m2. Computed randomization is used to divide conscripts into two groups; either the intervention group or the control group. Both types of capsules are administered once per day in the morning before breakfast for 7 months. Standardized coded packages (3 per conscript) and capsules (100 per package) are manufactured on a special order by Innopharma A/S (Denmark). No commercial sponsoring is involved. The key of the package code is stored in the computer database until unblinding of the results. Laboratory measurements Serum samples for clinical chemistry analysis are collected into serum clot activator tubes. Calcium measurements are performed using spectrophotometry method. Ionized calcium measurements are performed using ion selective electrodes. The direct chemiluminescent immunoassay method is used for measurement of PTH. 25(OH)D is measured using direct chemiluminescent immunoassay method. Power calculation The primary variable of the study is the level of 25 (OH)D in the serum. In the power analysis a difference of 20 nmol/L between the intervention and the control group is considered to be meaningful to detect. If the SD would be 25 nmol/L, then 26 participants would be needed in each group to reach a power of 80%. Statistical analysis The distribution of blood serum values in the study groups is described by means and standard deviations (SD). Differences in mean values of the variables of interest between the groups are evaluated using Welch t-test. The within group comparisons over time are performed using paired t-test with Bonferroni correction. Distributions of categorical variables are described by absolute numbers and percentages and compared between groups using the Fisher exact test. Statistical significance is set at the 0.05 probability level. ;

Study Design

Related Conditions & MeSH terms

Clinical Trial Details

NCT number	NCT04359524
Study type	Interventional
Source	Tartu University Hospital
Contact
Status	Completed
Phase	N/A
Start date	October 1, 2016
Completion date	April 25, 2017

View Details

See also
Status	Clinical Trial	Phase
Active, not recruiting	`NCT04244474` - Effect of Vitamin D Supplementation on Improvement of Pneumonic Children	Phase 1/Phase 2
Recruiting	`NCT05459298` - ViDES Trial (Vitamin D Extra Supplementation)	N/A
Completed	`NCT04476511` - The Efficacy and the Safety of Vitamin D3 30,000 IU for Loading Dose Schedules	Phase 3
Suspended	`NCT03652987` - Endocrine and Menstrual Disturbances in Women With Polycystic Ovary Syndrome (PCOS)
Completed	`NCT03920150` - Vitamin D 24'000 IU for Oral Intermittent Supplementation	Phase 3
Completed	`NCT03264625` - The Effects of Oral Vitamin D Supplementation on the Prevention of Peritoneal Dialysis-related Peritonitis	Phase 2
Completed	`NCT04183257` - Effect of Escalating Oral Vitamin D Replacement on HOMA-IR in Vitamin D Deficient Type 2 Diabetics	Phase 4
Recruiting	`NCT05084248` - Vitamin D Deficiency in Adults Following a Major Burn Injury	Phase 4
Completed	`NCT05506696` - Vitamin D Supplementation Study	N/A
Completed	`NCT00092066` - A Study to Evaluate the Safety, Tolerability, and Efficacy of an Investigational Drug and Dietary Supplement in Men and Postmenopausal Women With Osteoporosis (0217A-227)	Phase 3
Completed	`NCT03234218` - Vitamin D Levels in Liver Transplantation Recipients Prospective Observational Study
Completed	`NCT03203382` - Corneal Nerve Structure in Sjogren's
Completed	`NCT02906319` - Vitamin D and HbA1c Levels in Diabetic Patients With CKD	N/A
Completed	`NCT02714361` - A Study to Investigate the Effect of Vitamin D3 Supplementation on Iron Status in Iron Deficient Women	N/A
Completed	`NCT02118129` - Vitamin D Among Young Adults: an Intervention Study Using a Mobile 'App'.	N/A
Completed	`NCT02275650` - The Role of Narrowband Ultraviolet B Exposure in the Maintenance of Vitamin D Levels During Winter	N/A
Completed	`NCT02187146` - The Effects of Serum Vitamin D and IVF Outcome	N/A
Not yet recruiting	`NCT01419821` - Vitamin D and Its Affect on Growth Rates and Bone Mineral Density Until Age 5	N/A
Completed	`NCT01688102` - The Effect of Oral Vitamin D Versus Narrow-Band UV-B Exposure on the Lipid Profile	N/A
Completed	`NCT01651000` - Safety and Efficacy of CTAP101 to Treat Secondary Hyperparathyroidism in Stage 3 or 4 CKD and Vitamin D Insufficiency	Phase 3

Clinical trials are conducted in a series of steps, called phases - each phase is designed to answer a separate research question.

Phase 1: Researchers test a new drug or treatment in a small group of people for the first time to evaluate its safety, determine a safe dosage range, and identify side effects.
Phase 2: The drug or treatment is given to a larger group of people to see if it is effective and to further evaluate its safety.
Phase 3: The drug or treatment is given to large groups of people to confirm its effectiveness, monitor side effects, compare it to commonly used treatments, and collect information that will allow the drug or treatment to be used safely.
Phase 4: Studies are done after the drug or treatment has been marketed to gather information on the drug's effect in various populations and any side effects associated with long-term use.