Does Vitamin D Concentration Matter? The Consequential Effects of Serum Vitamin D Concentration and Supplementation on Paediatric Fracture Risk.

Mean serum 25(OH)D concentration was significantly lower in children with fractures compared to controls.

• Mean serum 25(OH)D was 27.44 ± 12.26 ng/mL in the fracture group versus 30.75 ± 15.21 ng/mL in controls.
• The difference was statistically significant (p = 0.007).
• One-way ANOVA was used to determine statistical significance between groups.
• The study included 4530 children total: 157 fracture cases and 4373 controls.

Sub-sufficient vitamin D status (below 30 ng/mL) was more prevalent among fracture patients.

• Sub-sufficient vitamin D status (<30 ng/mL) was more prevalent among fracture patients (p = 0.001).
• Suboptimal, insufficient, and deficient categories were each significantly associated with fractures (p = 0.001, p = 0.001, and p = 0.014, respectively).
• Chi-square tests were used to evaluate the association between 25(OH)D concentrations and fracture risk.
• The study evaluated multiple thresholds of vitamin D status including insufficiency and deficiency categories.

An association between vitamin D supplementation and fracture risk was observed in the paediatric cohort.

• The association between vitamin D supplementation and fracture risk was detected using chi-square tests.
• The dataset did not permit the determination of causality and a protective effect cannot be inferred.
• The retrospective cross-sectional design limits causal interpretation of the supplementation findings.
• Prevalence of vitamin D supplementation was compared between fracture and non-fracture groups.

The study included a large Southeast Asian paediatric cohort with serum 25(OH)D measurements collected over an eight-year period.

• The retrospective cross-sectional study included children under 18 years with serum 25(OH)D concentrations measured between 2014 and 2022.
• A total of 4530 children were included in the analysis.
• The cohort comprised 157 fracture cases and 4373 controls.
• The study population was drawn from a Southeast Asian institution, representing a geographically distinct population from most prior studies.

The authors recommend that healthcare institutions aim to maintain serum 25(OH)D concentrations above 30 ng/mL in children.

• The recommendation threshold of >30 ng/mL was based on the observed association between sub-sufficient status (<30 ng/mL) and increased fracture risk.
• The authors describe vitamin D status optimisation as 'a modifiable factor in paediatric bone health.'
• The association between vitamin D status and paediatric fracture risk was described as 'controversial, with inconsistent findings across existing studies' prior to this investigation.
• The authors note causality cannot be inferred from the retrospective dataset despite the observed associations.