Table 4. Multivariable-adjusted associations between natural log-transformed fibroblast growth factor-23 and anthropometrics (BMI and WC, waist circumference) in the overall sample and by chronic kidney disease (CKD) status.

		Overall			Non-CKD		CKD
		β	P	P interaction	β	P	β	P
Model 1	BMI	0.66	0.04	0.003	1.36	0.005	-0.68	0.19
	WC	1.61	0.04	0.003	3.02	0.004	-1.53	0.28
Model 2	BMI	0.73	0.04	0.007	1.40	0.01	-0.53	0.34
	WC	1.28	0.12	0.01	2.45	0.03	-1.39	0.38

Model 1 is adjusted for age, sex, race, and region of residence. Model 2 is adjusted for indices of socioeconomic status, history of coronary heart disease and/or stroke, lifestyle habits (tobacco usage, alcohol consumption, physical activity), serum calcium, phosphorus, eGFR and UACR. In models stratified by CKD status, Model 2 was not adjusted for eGFR and UACR.