Table 3.

Association between clinical parameters and bone formation (osteocalcin) and bone resorption (TRAP, NTx)

	Osteocalcin		TRAP		NTx
Parameter	R	P-value	R	P-value	R	P-value
Age, years	−0.37	<0.0001	−0.42	<0.0001	−0.66	<0.0001
Gender	–	0.01	–	0.44	–	0.058
Ethnicity	–	0.52	–	0.31	–	0.90
Height, cm	−0.07	0.37	−0.18	0.02	−0.26	0.002
Weight, kg	−0.23	0.004	−0.27	0.0006	−0.32	0.0001
SLEDAI, units	−0.29	0.0002	−0.23	0.004	−0.09	0.26
Prednisone, mg/kg/day	−0.34	<0.0001	−0.04	0.67	−0.04	0.64
25-OH-vitamin D, ng/ml	0.15	0.07	0.15	0.07	−0.05	0.58
1,25-OH2-vitamin D, ng/ml	0.21	0.009	0.06	0.50	0.20	0.015
PTH, ng/l	0.02	0.79	0.003	0.97	−0.01	0.87
Osteocalcin, ng/ml	–	–	0.36	<0.0001	0.67	<0.0001
TRAP, U/l	0.36	<0.0001	–	–	0.41	<0.0001
NTxa	0.03	<0.0001	0.41	<0.0001	–	–

R-values are reported for continuous variables. ^anM BCE/mM creatinine; n = 166 for osteocalcin; n = 157 for TRAP; n = 153 for NTx. P > 0.10.