Table 2. Association between Fracture type and Quartiles of FGF23.

	HR (95%CI)			OR(95% CI)
FGF23 Quartiles	Nonspine fractures (N=386)	Hip Fractures (N=73)	† Major Osteoporotic fractures (N=109)	† Incident Vertebral Fractures (N=52)
	N=386	N=73	N=109	N=52
Q1 (ref)	1.0	1.0	1.0	1.0
Q2	1.2 0.09-1.6)	1.6 (0.8-3.4)	0.6 (0.4-1.1)	0.47 (0.2-1.08)
Q3	1.1 (0.8-1.5)	1.6 (0.7-3.4)	0.8 (0.5-1.3)	0.49 (0.21-1.14)
Q4	1.2 (0.9-1.7)	1.6 (0.7-3.5)	0.7 (0.4-1.2)	0.81 (0.39-1.66)
P trend	0.43	0.3	0.3	0.61
Q4 vs rest	1.1 (0.85-1.43)	1.15 (0.66-2.02)	0.91 (0.76-1.09)	1.25 (0.67-2.33)

Quartile cut-points 12.2, 16.6, 22.4 pg/ml

Models adjusted for age, race, clinic site and BMI

^†= fractures occurring in the random cohort only