P70: DIRECT UV‐LIGHT‐EXPOSURE IN EARLY INFANCY RATHER THAN ORAL VITAMIN D SUPPLEMENTATION MAY INFLUENCE ECZEMA DEVELOPMENT IN EARLY CHILDHOOD
Bibliographic record
Abstract
Background: Suboptimal vitamin D levels during critical periods of immune development associated with lifestyle-changes and living at higher latitudes have emerged as an explanation for the dramatically increasing incidence of allergic disease. However, randomized controlled trials (RCTs) are lacking. This study aims to explore the effects of early vitamin D supplementation and sunlight exposure in infancy on allergy outcomes within the first 2.5 years of life and very early immune development. Method: 195 high-risk infants were orally supplemented with either placebo or 400 IU vitamin D/day until 6 months of age in a Double-Blind-RCT. An ultraviolet (UV)-dosimeter was worn to measure direct UV-light-exposure (290-380 nm). Vitamin D levels were measured at 3, 6, 12 and 30 months of age. Immune function outcomes were assessed at 6 months, food allergy, eczema and wheeze at 6, 12 and 30 months and allergic rhinitis at 30 months. Results: Vitamin D levels were higher for the vitamin D supplemented than the placebo group at three (p < 0.001) and six (p = 0.023) months of age, however no difference was seen in food allergy, eczema, wheeze or allergic rhinitis incidence between groups for the first 2.5 years of life. Infants without eczema within the first 2.5 years of life were found to have had more UV light exposure (median (IQR)) 998 (676-1577) J/m2 compared to those with eczema 555 (322-1210) J/m2, p = 0.023. UV light exposure was also inversely correlated with IL-2, eotaxin production, GMCSF and to Toll-like receptor ligands. Summary: This first RCT on vitamin D supplementation in infancy showed no influence on allergy outcomes in early childhood. However, we demonstrate an association between higher direct UV-light-exposures in the first 3 months of life with lower incidence of pro-inflammatory immune markers by 6 months of age and eczema outcome over the first 2.5 years. Conclusion: UV-light-exposure appears more beneficial than vitamin D supplementation in influencing immune development and prevent from eczema development in early childhood.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".