PTH and hyperparathyroidism: Moreover, evaluating KS patients and controls with the same 25(OH)D levels, the mean PTH values (50.03 ± 17.95 versus 30.25 ± 12.21 pg/mL) and the percentage of hyperparathyroidism (17.5% versus 2.5%, p < 0.0001) were significantly higher in KS children and adolescents.