| (25-OHD) | 25-hydroxy vitamin D |
| (25-OHD3) | 25-hydroxy vitamin D |
| CG | Control group |
| CD | Celiac disease |
| CLIA | Chemiluminescent immunoassay |
| CYP27B1 | 1α-hydroxylase |
| DC | Dendritic cell |
| ESPGHAN | European Society for Paediatric Gastroenterology Hepatology and Nutrition |
| IQR | Interquartile range |
| ISPAD | International Society of Pediatric and Adolescent Diabetes |
| T1D | Type 1 diabetes |