Table 5. Partial correlation coefficients for bone turnover markers with sex, age, BMI, smoking status, serum calcium, creatinine, PTH, 25(OH)D and HOMA as control variables in the 406 subjects.

	P1NP		Lg. CTX-1		DKK1		Lg. Leptin
	Partial correlation coefficient	P-value	Partial correlation coefficient	P-value	Partial correlation coefficient	P-value	Partial correlation coefficient	P-value
Serum P1NP (pg/ml)			0.655	<0.001	0.014	0.774	-0.012	0.813
Lg. serum CTX-1 (pg/ml)	0.655	<0.001			0.001	0.982	-0.043	0.395
Serum DKK1 (pg/ml)	0.014	0.774	0.001	0.982			0.205	<0.001
Lg. serum Leptin (pg/ml)	-0.012	0.813	-0.043	0.395	0.205	<0.001
Serum TNF-α (pg/ml)	0.104	0.040	0.147	0.003	0.237	<0.001	0.150	0.003
Lg. serum OPG (pg/ml)	0.102	0.043	-0.017	0.735	0.199	<0.001	0.160	0.001
Lg. serum sclerostin pg/ml)	-0.084	0.095	-0.120	0.017	0.139	0.006	0.138	0.006
BMD total hip (g/cm2)*	-0.208	<0.001	-0.224	<0.001	0.039	0.481	-0.026	0.640
BMD L1 (g/cm2)*	-0.116	0.038	-0.143	0.010	-0.007	0.907	0.054	0.038

*n = 334