Table 4.
Univariate linear regression analysis for serum ß-CTx and P1NP.
|
ß-CTx (ng/mL) N = 360 |
P1NP (ng/mL) N = 360 |
|||||
|---|---|---|---|---|---|---|
| ß | SE | P-value | ß | SE | P-value | |
| 25(OH)D, ng/ml | −0.004 | 0.004 | 0.25 | −0.004 | 0.003 | 0.24 |
| PTH, pg/ml | 0.003 | 0.001 | 0.04 | 0.001 | 0.001 | 0.59 |
| Age, years | −0.003 | 0.003 | 0.39 | −0.002 | 0.003 | 0.42 |
| YSM, years | −0.002 | 0.003 | 0.49 | −0.001 | 0.002 | 0.55 |
| BMI, kg/m2 | −0.024 | 0.006 | < 0.0001 | −0.015 | 0.005 | < 0.01 |
*Winter season sample from Beijing, Shanghai, and Hunan. SE, standard error; YSM, years since menopause ; BMI, body mass index; ß-CTx, C-terminal telopeptide of type I collagen; P1NP, N-terminal propeptide of type I collagen.
ß-CTx: 0.523 (0.22)/P1NP: 54.5 (24.0); data are presented as mean (SD); ß -CTx is log-transformed to achieve a normal distribution. ß-CTx and P1NP levels were not significantly different as grouped by subjects who had serum 25(OH)D> = 30, 20–30, and < 20 ng/mL, respectively (ANOVA P = 0.22, 0.19).