a marginal trendP = 0.09
No statistically significant differences were observed across all 25(OH)D threshold groups for metabolic indices (BMI, HbA1c), thyroid hormones (T4, fT4), TSH, bone formation marker osteocalcin (OC), or demographic variable age, although age displayed a marginal trend between 25(OH)D <10 and ≥10 ng/mL (P = 0.09).