Characteristics of patients according to severe vitamin D deficiency.

*except for the season variable, P values obtained from models including season, ethnicity, season-ethnicity interaction, and the considered variable.IQR: interquartile range, NA: not applicable, DEXA: dual energy X-ray absorptiometry, SAT: subcutaneaous adipose tissue, VAT: visceral adipose tissue, CT: computed tomography, eGFR: estimated glomerular filtration rate, IL-6: interleukin 6, hsCRP: high sensitivity C-reactive protein, TNF: tumor necrosis factor, sTNFR: soluble TNF receptor, OGTT t120: oral glucose tolerance test (sample taken 120 minutes after glucose administration), HOMA-IR: homeostatic model assessment of insulin resistance.