Table 1.
Clinical and laboratory characteristics.
Table 2.
Differences in the levels of bone turnover markers in females in different serum 25(OH)D level groups.
Table 3.
Differences in the values of bone turnover markers in males with different levels of serum 25(OH)D.
Figure 1.
Relationships between the serum 25(OH)D concentration and the concentrations of PTH and bone turnover markers in males.
(A) PTH. There was a relatively steep decrease in the concentration of PTH up to 20 ng/mL 25(OH)D and a more gradual decrease between 20 and 40 ng/mL 25(OH)D. This relationship between the serum concentrations of 25(OH)D and PTH exhibited no plateau for serum 25(OH)D levels up to 40 ng/mL. (B–D) β-CTX, OC, and P1NP, respectively. LOESS plots show the plateau levels of bone turnover markers and the 25(OH)D level at which these plateaus are reached, corresponding to 30 ng/mL. When the serum 25(OH)D levels are lower than 30 ng/mL, the levels of the bone turnover markers begin to increase.
Figure 2.
Relationships between serum 25(OH)D concentration and the concentrations of PTH and bone turnover markers in females.
(A) PTH. The inverse relationship between the serum concentrations of 25(OH)D and PTH was observed with a gradual decrease up to 40 ng/mL. This relationship between the serum concentrations of 25(OH)D and PTH exhibited no plateau for serum 25(OH)D levels up to 40 ng/mL. (B–D) β-CTX, OC, and P1NP, respectively. LOESS plots show an inverse relationship between the serum concentration of 25(OH)D and bone turnover markers, but no plateau was observed for serum 25(OH)D levels up to 40 ng/mL.