TABLE 3.

Correlation analysis of the correlations between BTMs, lifestyle, treatment, and LS 1-4 BMD change^a

	LS 1-4 BMD change
Variable	R 2	P
1 y N-NID	−0.069	0.002
N-NID change	−0.200	< 0.001
1 y P1NP	−0.167	< 0.001
P1NP change	−0.230	< 0.001
1 y β-CTX	−0.116	< 0.001
β-CTX change	−0.186	< 0.001
1 y Phosphorus	−0.002	0.626
Phosphorus change	−0.044	0.015
Smoking behavior	−0.019	0.112
Alcohol intake	−0.039	0.021
Physical activity	0.090	< 0.001
Treatment	0.134	< 0.001

All P values were calculated with the Pearson or Spearman correlation analysis. P value < 0.05 was considered to indicate a statistically significant difference (highlighted in bold).

BMD, bone mineral density; BTMs, bone turnover markers; β -CTX, β -C-terminal telopeptide of type I collagen; LS, lumbar spine; N-NID, N-terminal middle segment osteocalcin; P1NP, propeptide of type I procollagen; R², correlation coefficient.

^a change was calculated as the variable value at year follow-up minus the variable value at baseline.