CYP27A1 and osteoporosis: In the osteoporosis group, the OC level showed a statistically significant decrease from 13.2 ± 5.5 at T0 to 11.36 ± 5.1 at T1 (p < 0.05), and the CTX level also showed a statistically significant decrease from 0.3 ± 0.2 at T0 to 0.21 ± 0.1 at T1 (p < 0.05).