. 2023 Dec 4;35(1):57–65. doi: 10.1681/ASN.0000000000000264

Table 2.

Spearman correlations between baseline eGFR, serum total CO₂, and bone health markers

Measurement	TCO₂	FGF-23	PTH	Klotho	25-D	1,25-D	U Ca/Cr	B-SAP	CTX-1	P1NP	TRAP5b
eGFR^a	0.13	−0.43^a	−0.25^a	0.07	−0.02	0.13	0.01	0.06	−0.28^a	−0.07	−0.03
	TCO₂^a	−0.04	0.03	0.07	0.07	0.12	0.20^a	−0.13	−0.02	−0.02	0.08
		FGF-23^a	0.30^a	−0.05	0.02	−0.35^a	0.13	−0.09	0.14	0.02	0.05
			PTH^a	0.09	−0.18^a	0.13	−0.25	0.25^a	0.45^a	0.29	0.24
				Klotho^a	−0.02^a	0.06	−0.03	0.23^a	−0.04	0.05	0.05
					25-D^a	0.14	0.17^a	−0.03	−0.14	−0.19^a	0.001
						1,25-D^a	0.01^a	0.12^a	−0.01	−0.06	0.09
							Ca/Cr^a	−0.03	−0.05	0.05	0.03
								BSAP^a	0.43^a	0.60^a	0.23^a
									CTX-1^a	0.64^a	0.23^a
										P1NP^a	0.19^a

1,25-D; 1,25-dihydroxyvitamin D; 25-D, 25-hydroxyvitamin D; B-SAP, bone-specific alkaline phosphatase; Ca/Cr, urine calcium/creatinine; CTX-1, C-terminal telopeptide of type I collagen; FGF-23, fibroblast growth factor-23; P1NP, procollagen type I intact N-terminal propeptide; PTH, parathyroid hormone; TCO_2, total CO₂; TRAP5b, tartrate-resistant acid phosphatase 5b.

P < 0.05.