Similar data were reported by Jiang et al. [47] (p < 0.001, p < 0.001, and p < 0.001) [47], and by Loh et al. [52] concerning lower serum Ca levels (p < 0.013) and increased PTH (p < 0.027) compared to individuals with essential hypertension (24 h urinary calcium was not assessed in this particular cohort) [52]. Here, PTH is linked to essential hypertension.