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6 ng/mL for 25OHVitD3 (p 0.0001), -11.1 pg/mL for PTH (p 0.0001), and -47.5 IU/mL for ALP (p= 0.01). There were no differences in calcium concentrations. In sum mer, 97.6% of the subjects were classified with sufficiency status ( 20 ng/mL), which decreased significantly in winter to 54.3% (p 0.0001). In winter, 25OHVitD3 concentrations decreased in approximately half of the children, which was associated with an increase in PTH and ALP, and normal calcium concentrations. According to our results, children may need VitD