PTH and chronic kidney disease: In the CKD patients, PTH was significantly correlated with sCr (p < 0.001; r = 0.8; CI: 0.558, 0.868) and P (p < 0.001; r = 0.67; CI: 0.462, 0.835), while it was not significantly correlated with tCa and iCa (p = 0.200 and 0.080, respectively).