Clinical Trial Results:
Placebo controlled study on effects of vitamin D supplementation in type 1 diabetic subjects on immunological, endocrine and metabolic parameters: Step 2 of the Austrian Diabetes Prevention Programme (ADPP-002)
Summary
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EudraCT number |
2010-018901-12 |
Trial protocol |
AT |
Global end of trial date |
27 Jan 2014
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Results information
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Results version number |
v1(current) |
This version publication date |
06 Aug 2021
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First version publication date |
06 Aug 2021
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Other versions |
Trial Information
Subject Disposition
Baseline Characteristics
End Points
Adverse Events
More Information
Subject Disposition
Baseline Characteristics
End Points
Adverse Events
More Information
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Trial identification
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Sponsor protocol code |
ADPP-002ENM-DA-017
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Additional study identifiers
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ISRCTN number |
- | ||
US NCT number |
NCT01390480 | ||
WHO universal trial number (UTN) |
- | ||
Sponsors
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Sponsor organisation name |
Medical University of Graz, Department of Internal Medicine, Division of Endocrinology and Diabetology, Austria
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Sponsor organisation address |
Auenbruggerplatz 15, Graz, Austria, 8036
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Public contact |
Co-investigator:
Gerlies Treiber, Medical University of Graz, gerlies.treiber@medunigraz.at
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Scientific contact |
Principal Investigators:
Thomas R. Pieber and Martin Borkenstein, Medical University of Graz, thomas.pieber@medunigraz.at
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Paediatric regulatory details
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Is trial part of an agreed paediatric investigation plan (PIP) |
No
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Does article 45 of REGULATION (EC) No 1901/2006 apply to this trial? |
No
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Does article 46 of REGULATION (EC) No 1901/2006 apply to this trial? |
No
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Results analysis stage
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Analysis stage |
Final
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Date of interim/final analysis |
16 Jul 2014
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Is this the analysis of the primary completion data? |
Yes
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Primary completion date |
11 Sep 2013
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Global end of trial reached? |
Yes
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Global end of trial date |
27 Jan 2014
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Was the trial ended prematurely? |
No
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General information about the trial
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Main objective of the trial |
To evaluate whether vitamin D supplementation significantly alters the proportion of circulating CD4+ T cells in subjects with type 1 diabetes (T1D)
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Protection of trial subjects |
The trial was conducted in accordance with the Declaration of Helsinki and ICH Good Clinical Practice. All study participants were required to give written informed consent before any trial-related activities were initiated. Informed consent was either given by the participants or their guardians and in addition, assent from all children was obtained.
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Background therapy |
- | ||
Evidence for comparator |
- | ||
Actual start date of recruitment |
05 Nov 2010
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Long term follow-up planned |
No
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Independent data monitoring committee (IDMC) involvement? |
No
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Population of trial subjects
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Number of subjects enrolled per country |
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Country: Number of subjects enrolled |
Austria: 30
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Worldwide total number of subjects |
30
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EEA total number of subjects |
30
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Number of subjects enrolled per age group |
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In utero |
0
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Preterm newborn - gestational age < 37 wk |
0
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Newborns (0-27 days) |
0
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Infants and toddlers (28 days-23 months) |
0
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Children (2-11 years) |
11
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Adolescents (12-17 years) |
13
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Adults (18-64 years) |
6
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From 65 to 84 years |
0
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85 years and over |
0
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Recruitment
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Recruitment details |
Recruitment was performed in three diabetes outpatient clinics in Austria (Graz, Vienna and Salzburg). | |||||||||
Pre-assignment
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Screening details |
A total of 31 participants were screened and 30 were enrolled and randomly allocated in a 1:1 ratio to the treatment or placebo group. Out of these, 29 participants (treatment group n=14, placebo group n=15) completed the trial. Only the completers were included in the analysis. | |||||||||
Period 1
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Period 1 title |
Overall trial (overall period)
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Is this the baseline period? |
Yes | |||||||||
Allocation method |
Randomised - controlled
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Blinding used |
Double blind | |||||||||
Roles blinded |
Subject, Investigator, Monitor, Carer | |||||||||
Blinding implementation details |
The random allocation sequence was provided by staff with no other involvement in the trial. Unblinded trial staff ensured the correct treatment allocation and dispensing of trial products. Trial products were filled by an independent pharmacy and sent blinded to the study centres. They were visually identical, and were packed and labelled to fulfil the requirements for double-blind procedures.
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Arms
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Are arms mutually exclusive |
Yes
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Arm title
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Treatment group | |||||||||
Arm description |
The trial consisted of 14 visits (a baseline visit, study visits after 1, 3, 6, 9 and 12 months, a follow-up visit after 13 months and regular telephone visits in between). In the first month of treatment a loading dose of 140 IU cholecalciferol/kg body weight/day was administered to achieve serum vitamin D (25(OH)D) levels in the upper normal range. Oleovit D3 Tropfen (vitamin D drops, 400 IU/drop) was given orally once weekly. Compliance was assessed by phone contacts and the participant’s study diaries. 15 participants have been allocated to the treatment group. One participant of the treatment group was excluded after 3 months due to intentional additional intake of vitamin D supplementation and all data from this participant were excluded from analysis. | |||||||||
Arm type |
Experimental | |||||||||
Investigational medicinal product name |
OLEOVIT D3 Tropfen (Fresenius Kabi, Austria)
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Investigational medicinal product code |
10.989
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Other name |
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Pharmaceutical forms |
Oral drops
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Routes of administration |
Oral use
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Dosage and administration details |
Oleovit D3 drops, oral administration; 140 IU cholecalciferol/kg body weight/day in the first month followed by 70 IU cholecalciferol/kg body weight/day; the dose was weight-adjusted once weekly.
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Arm title
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Placebo group | |||||||||
Arm description |
The trial consisted of 14 visits (a baseline visit, study visits after 1, 3, 6, 9 and 12 months, a follow-up visit after 13 months and regular telephone visits in between). Placebo (peanut oil) was given orally once weekly. Compliance was assessed by phone contacts and the participant’s study diaries. | |||||||||
Arm type |
Placebo | |||||||||
Investigational medicinal product name |
Placebo
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Investigational medicinal product code |
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Other name |
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Pharmaceutical forms |
Oral drops
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Routes of administration |
Oral use
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Dosage and administration details |
Peanut oil suspension, oral administration, amount equal to Oleovit D3 Tropfen.
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Notes [1] - The number of subjects reported to be in the baseline period are not the same as the worldwide number enrolled in the trial. It is expected that these numbers will be the same. Justification: One participant of the treatment group was excluded after 3 months due to intentional additional intake of vitamin D supplementation and all data from this participant were excluded from analysis. |
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Baseline characteristics reporting groups
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Reporting group title |
Treatment group
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Reporting group description |
The trial consisted of 14 visits (a baseline visit, study visits after 1, 3, 6, 9 and 12 months, a follow-up visit after 13 months and regular telephone visits in between). In the first month of treatment a loading dose of 140 IU cholecalciferol/kg body weight/day was administered to achieve serum vitamin D (25(OH)D) levels in the upper normal range. Oleovit D3 Tropfen (vitamin D drops, 400 IU/drop) was given orally once weekly. Compliance was assessed by phone contacts and the participant’s study diaries. 15 participants have been allocated to the treatment group. One participant of the treatment group was excluded after 3 months due to intentional additional intake of vitamin D supplementation and all data from this participant were excluded from analysis. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Reporting group title |
Placebo group
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Reporting group description |
The trial consisted of 14 visits (a baseline visit, study visits after 1, 3, 6, 9 and 12 months, a follow-up visit after 13 months and regular telephone visits in between). Placebo (peanut oil) was given orally once weekly. Compliance was assessed by phone contacts and the participant’s study diaries. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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End points reporting groups
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Reporting group title |
Treatment group
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Reporting group description |
The trial consisted of 14 visits (a baseline visit, study visits after 1, 3, 6, 9 and 12 months, a follow-up visit after 13 months and regular telephone visits in between). In the first month of treatment a loading dose of 140 IU cholecalciferol/kg body weight/day was administered to achieve serum vitamin D (25(OH)D) levels in the upper normal range. Oleovit D3 Tropfen (vitamin D drops, 400 IU/drop) was given orally once weekly. Compliance was assessed by phone contacts and the participant’s study diaries. 15 participants have been allocated to the treatment group. One participant of the treatment group was excluded after 3 months due to intentional additional intake of vitamin D supplementation and all data from this participant were excluded from analysis. | ||
Reporting group title |
Placebo group
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Reporting group description |
The trial consisted of 14 visits (a baseline visit, study visits after 1, 3, 6, 9 and 12 months, a follow-up visit after 13 months and regular telephone visits in between). Placebo (peanut oil) was given orally once weekly. Compliance was assessed by phone contacts and the participant’s study diaries. |
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End point title |
Changes in number and function of regulatory T cells | ||||||||||||||||||||||||||||||||||||
End point description |
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End point type |
Primary
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End point timeframe |
Months 0, 3, 6 and 12 of treatment
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Statistical analysis title |
Statistical analysis | ||||||||||||||||||||||||||||||||||||
Statistical analysis description |
Data were checked for normality by using Shapiro-Wilk test. Data that were not normally distributed were log transformed for analysis. Data were analysed with two-way repeated-measures ANOVA to determine changes over 12 months. Student’s t-test awas applied to compare differences between the groups. Mann-Whiney U-test was used for group comparisons if data deviated from normality. For the primary end point, the Bonferroni-Holm procedure was used to maintain an overall type 1 error rate of 5%.
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Comparison groups |
Treatment group v Placebo group
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Number of subjects included in analysis |
29
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Analysis specification |
Pre-specified
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Analysis type |
other | ||||||||||||||||||||||||||||||||||||
P-value |
< 0.05 | ||||||||||||||||||||||||||||||||||||
Method |
ANOVA | ||||||||||||||||||||||||||||||||||||
Confidence interval |
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End point title |
Effect on apoptosis of Tregs and Teffs | ||||||||||||||||||||||||||||||||||||
End point description |
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End point type |
Secondary
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End point timeframe |
Months 0, 3, 6 and 12 of treatment
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No statistical analyses for this end point |
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End point title |
Effect on endogenous insulin production | |||||||||||||||||||||
End point description |
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End point type |
Secondary
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End point timeframe |
Months 0, 6 and 12 of treatment
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No statistical analyses for this end point |
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End point title |
Effect on HbA1c | ||||||||||||||||||||||||
End point description |
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End point type |
Secondary
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End point timeframe |
Months 0, 3, 6 and 12 of treatment
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No statistical analyses for this end point |
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End point title |
Effect on insulin requirement | ||||||||||||||||||||||||
End point description |
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End point type |
Secondary
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End point timeframe |
Months 0, 3, 6 and 12 of treatment
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No statistical analyses for this end point |
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End point title |
Effect on serum 25(OH)D | ||||||||||||||||||||||||
End point description |
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End point type |
Secondary
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End point timeframe |
Months 0, 3, 6 and 12 of treatment
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No statistical analyses for this end point |
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End point title |
Effect on serum calcium | ||||||||||||||||||||||||
End point description |
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End point type |
Secondary
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End point timeframe |
Months 0, 3, 6 and 12 of treatment
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No statistical analyses for this end point |
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End point title |
Effect on serum parathormone | ||||||||||||||||||||||||
End point description |
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End point type |
Secondary
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End point timeframe |
Months 0, 3, 6 and 12 of treatment
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No statistical analyses for this end point |
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End point title |
Effect on urine calcium/creatinine ratio | ||||||||||||||||||||||||
End point description |
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End point type |
Secondary
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End point timeframe |
Months 0, 3, 6 and 12 of treatment
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No statistical analyses for this end point |
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Adverse events information
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Timeframe for reporting adverse events |
All adverse events were collected from written informed consent up to the follow-up visit, regardless of seriousness or relationship to the trial products.
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Assessment type |
Systematic | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Dictionary used for adverse event reporting
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Dictionary name |
MedDRA | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Dictionary version |
24.0
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Reporting groups
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Reporting group title |
Treatment group
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Reporting group description |
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Reporting group title |
Placebo group
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Reporting group description |
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Frequency threshold for reporting non-serious adverse events: 0% | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Substantial protocol amendments (globally) |
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Were there any global substantial amendments to the protocol? No | |||
Interruptions (globally) |
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Were there any global interruptions to the trial? No | |||
Limitations and caveats |
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Limitations of the trial such as small numbers of subjects analysed or technical problems leading to unreliable data. | |||
None reported | |||
Online references |
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http://www.ncbi.nlm.nih.gov/pubmed/26277548 |