Prevalence of Inadequate Vitamin D Status and Associated Factors in Children With Cystic Fibrosis
Why this work is in the frame
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Bibliographic record
Abstract
BACKGROUND: This study aimed to determine the prevalence of inadequate serum 25-hydroxyvitamin D (25(OH)D) levels in a pediatric Canadian cystic fibrosis (CF) population and to assess the effectiveness of a vitamin D supplementation protocol on improving vitamin D status. A secondary objective was to analyze factors that may be associated with inadequate 25(OH)D levels. METHODS: Vitamin D supplementation, 25(OH)D levels, and factors hypothesized to be associated with 25(OH)D levels were collected through a retrospective chart review (2010 and 2011) of 96 patients (1-18 years) at one CF clinic in Canada. Adequacy of 25(OH)D was set at ≥75 nmol/L. Patients with inadequate 25(OH)D levels in 2010 were prescribed an additional 1000 IU/d for levels <60 nmol/L or 400 IU/d for levels 60-75 nmol/L. RESULTS: Inadequate 25(OH)D levels were observed in 26% of patients in 2010 and 23% in 2011. After supplementation was increased for those with inadequate 25(OH)D levels in 2010 (n = 20), a significant increase in 25(OH)D levels was observed in 2011 (P = .03). Adequate status was achieved in 50% of these patients (n = 10). Age was significantly negatively associated with 25(OH)D levels in both years (P = .002). Percentage of forced expiratory volume in 1 second was significantly positively associated with 25(OH)D levels in 2011 (P = .03). CONCLUSION: While vitamin D supplementation was effective at increasing serum 25(OH)D, this protocol did not achieve optimal serum 25(OH)D levels in 25% of the population. Increasing age had the strongest association with 25(OH)D. Current supplementation protocols may require reevaluation based on emerging evidence and revised Cystic Fibrosis Foundation guidelines.
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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 | 0.002 | 0.053 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| 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) | 0.000 | 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 it