Fig. 2

Concentrations of serum 25OHD for all CSA patients at baseline according to final diagnosis after 12 months. Boxes represent median and interquartile range (IQR), whiskers represent the range. Values for each group are as follow: (i) Remained CSA, n = 60, median 47.1, IQR 29.6–68.8; (ii) Progressed to UIA, n = 11, median 42.0, IQR 28.5–88.5; (iii) Progressed to RA, n = 28, median 51.8, IQR 25.9–76.0; (iv) Progressed to Other; n = 6, median 54.0, IQR 40.8–81.5. There were no statistically significant differences between groups (p = 0.851)