Table 2.
BMD at all sites, P1NP, and β-CTX values in different age groups.
| Age group (years) | Lumbar spine BMD | Femoral neck BMD | Total hip BMD | P1NP | β-CTX |
|---|---|---|---|---|---|
| 45-49 (N = 12) | 0.964 (0.164) | 0.802 (0.104) | 0.880 (0.122) | 45.40 (41.40, 51.71) | 0.20 (0.16, 0.22) |
| 50-54 (N = 102) | 0.885 (0.143) | 0.747 (0.110) | 0.849 (0.122) | 55.12 (41.85, 76.14) | 0.29 (0.20, 0.36) |
| 55-59 (N = 205) | 0.875 (0.132) | 0.733 (0.107) | 0.842 (0.115) | 55.53 (44.83, 70.60) | 0.26 (0.21, 0.34) |
| 60-64 (N = 290) | 0.831 (0.132) | 0.692 (0.105) | 0.793 (0.111) | 52.68 (39.72, 67.97) | 0.26 (0.20, 0.34) |
| 65-69 (N = 251) | 0.817 (0.134) | 0.659 (0.101) | 0.761 (0.113) | 52.11 (40.87, 69.16) | 0.28 (0.20, 0.36) |
| 70-74 (N = 135) | 0.828 (0.163) | 0.658 (0.135) | 0.760 (0.148) | 51.56 (38.61, 64.37) | 0.28 (0.22, 0.36) |
| 75-79 (N = 60) | 0.799 (0.135) | 0.605 (0.114) | 0.696 (0.119) | 49.17 (36.07, 64.34) | 0.27 (0.21, 0.34) |
| Statistics | 8.05 | 23.19 | 21.90 | 8.58 | 11.80 |
| P | <0.001a | <0.001a | <0.001a | 0.20b | 0.07b |
N: number of subjects; BMD: bone mineral density; P1NP: procollagen type 1 N-terminal propeptide; β-CTX: β cross-linked C-telopeptide of type 1 collagen. aP values were obtained by one-way ANOVA. bP values were obtained by the Kruskal-Wallis test.