Trial reportAnnals of allergy, asthma & immunology : official publication of the American College of Allergy, Asthma, & Immunology2018
Association of free vitamin D
Trial report in Annals of allergy, asthma & immunology : official publication of the American College of Allergy, Asthma, & Immunology, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 6 papers.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
6 citing papers in PubMed, 10 citations in OpenAlex.
- Dietary and Plasma Polyunsaturated Fatty Acids Are Inversely Associated with Asthma and Atopy in Early Childhood.The journal of allergy and clinical immunology. In practice · 2019Trial
- Vitamin D binding protein is not affected by high-dose vitamin D supplementation: a post hoc analysis of a randomised, placebo-controlled study.BMC research notes · 2018Trial
- Review
- Development of free 25-hydroxyvitamin D3 assay method using liquid chromatography-tandem mass spectrometry.Bioscience reports · 2022Article
- Asthma and Vitamin D Deficiency: Occurrence, Immune Mechanisms, and New Perspectives.Journal of immunology research · 2022Review
- Vitamin D Binding Protein and the Biological Activity of Vitamin D.Frontiers in endocrinology · 2019Review
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
12 authors at 10 institutions in 1 country.
Funding
Abstract
backgroundUse of vitamin D
objectiveTo determine associations between free vitamin D3 concentrations and rates of treatment failure and exacerbations in patients with asthma participating in the Vitamin D Add-on Therapy Enhances Corticosteroid Responsiveness in Asthma (VIDA) trial.
methodsFree concentrations were directly measured by enzyme-linked immunosorbent assay and stratified into low, medium, and high groups: less than 5pg/mL (n = 65), 5 to 9pg/mL (n = 84), and greater than 9pg/mL (n = 48) after 12 weeks of supplementation with oral vitamin D3 and associated with outcomes.
resultsOutcomes did not associate with free concentrations: overall treatment failure rates were 0.60 (95% confidence interval [CI] 0.46-0.78), 0.53 (95%CI 0.40- 0.70), and 0.69 (95%CI 0.54-0.90)/person-year (P = .51), respectively; overall exacerbation rates were 0.28 (95%CI 0.17-0.48), 0.15 (95%CI 0.08-0.30) and 0.42 (95%CI 0.27-0.66)/person-year (P = .22). Mean (standard deviation) baseline free concentrations were lower in non-Hispanic blacks and Hispanics compared with non-Hispanic whites: 4.10 (1.33) and 4.38 (1.11) pg/mL vs 5.16 (1.65) pg/ml, (P < .001 and P = 0.038), respectively. Mean (standard deviation) baseline free concentrations differed between females and males: 4.57 (1.58) and 5.08 (1.41) (P = .026); and between non-overweight (body mass index [BMI] < 25) and overweight (BMI > 25): 5.45 (1.86) vs 4.54 (1.39) (P < .001). The free fraction differed by race and sex but not by BMI.
conclusionThe use of free concentrations was inferior to total concentrations as a biomarker of efficacy of vitamin D
Indexed as
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Registered trials
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