Seasonal Vitamin D Status in Polish Elite Athletes in Relation to Sun Exposure and Oral Supplementation
Fig 1
Annual distribution of serum 25(OH)D concentration.
Annual distribution of 25(OH)D concentration in serum demonstrated as mean value for consecutive months and seasons in all athletes (mean ± SE, OUTD and IND groups together, n = 1011); the dashed line represents the concentration level considered to be adequate; * denotes a significant difference between summer and other seasons: ***p<0.001.