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Upper panel. Box-plot of the circulating concentrations of 25-hydroxy-vitamin D across the four seasons. The boxes include values between the 1st and the 3rd quartile (i.e., the interquartile range). The whiskers include values between: 1st quartile − 1.5 times interquartile range and 3rd quartile + 1.5 times interquartile range. Lower panel. Frequency of adequate, insufficient or deficient concentrations of 25-hydroxy-vitamin D according to seasonality.
