Table 2 Prevalence of reduced BMD measured by dual-energy x-ray absorptiometry at different skeletal sites.
From: Osteoporosis in ankylosing spondylitis - prevalence, risk factors and methods of assessment
Measurement site | Age-group, years | BMD, mean ± SD | T-score, mean ± SD | Z-score, mean ± SD | Patients with osteoporosis/BMD below expected range for age, number (%)a | Patients with osteopenia, number (%) | Patients with normal BMD number (%) |
|---|---|---|---|---|---|---|---|
Women | |||||||
AP lumbar spine | < 50 | 1.014 ± 0.134 | -0.30 ± 1.22 | 0.02 ± 1.25 | 2 (5) | 0 (0) | 41 (95) |
≥ 50 | 0.899 ± 0.150 | -1.35 ± 1.37 | 0.14 ± 1.38 | 12 (27) | 15 (34) | 17 (39) | |
Lat lumbar spine | < 50 | 0.741 ± 0.102 | -0.94 ± 1.22 | -0.25 ± 1.26 | 3 (7) | 0 (0) | 40 (93) |
≥ 50 | 0.616 ± 0.114 | -2.43 ± 1.36 | -0.05 ± 1.42 | 20 (45) | 15 (34) | 9 (20) | |
Total hip | < 50 | 0.925 ± 0.122 | -0.13 ± 1.00 | 0.07 ± 0.99 | 0 (0) | 0 (0) | 43 (100) |
≥ 50 | 0.832 ± 0.108 | -0.89 ± 0.88 | 0.10 ± 0.85 | 0 (0) | 20 (46) | 23 (54) | |
Femoral neck | < 50 | 0.804 ± 0.127 | -0.41 ± 1.15 | -0.06 ± 1.13 | 0(0) | 0 (0) | 43 (100) |
≥ 50 | 0.702 ± 0.103 | -1.32 ± 0.93 | -0.01 ± 0.91 | 4 (9) | 24 (56) | 15 (35) | |
Total radius | < 50 | 0.576 ± 0.038 | -0.05 ± 0.70 | 0.32 ± 0.74 | 0(0) | 0 (0) | 43 (100) |
≥ 50 | 0.517 ± 0.065 | -1.14 ± 1.21 | 0.18 ± 1.09 | 7 (16) | 17 (39) | 20 (45) | |
Men | |||||||
AP lumbar spine | < 50 | 1.057 ± 0.154 | -0.31 ± 1.41 | -0.18 ± 1.41 | 3 (5) | 0 (0) | 57 (95) |
≥ 50 | 1.092 ± 0.184 | 0.18 ± 1.67 | 0.63 ± 1.72 | 4 (7) | 8 (14) | 44 (79) | |
Lat lumbar spine | < 50 | 0.782 ± 0.131 | NA | NA | NA | ||
≥ 50 | 0.740 ± 0.132 | NA | NA | NA | |||
Total hip | < 50 | 0.999 ± 0.137 | -0.23 ± 0.92 | -0.05 ± 0.90 | 1 (2) | 0 (0) | 59 (98) |
≥ 50 | 0.963 ± 0.136 | -0.46 ± 0.90 | 0.00 ± 0.93 | 0 (0) | 19 (33) | 38 (67) | |
Femoral neck | < 50 | 0.842 ± 0.130 | -0.67 ± 0.95 | -0.21 ± 0.93 | 1 (2) | 0 (0) | 59 (98) |
≥ 50 | 0.773 ± 0.122 | -1.16 ± 0.90 | -0.21 ± 0.90 | 5 (9) | 25 (44) | 27 (47) | |
Total radius | < 50 | 0.668 ± 0.050 | -0.34 ± 0.93 | -0.12 ± 0.91 | 1 (2) | 0 (0) | 59 (98) |
≥ 50 | 0.633 ± 0.063 | -1.03 ± 1.21 | -0.25 ± 1.20 | 9 (16) | 18 (33) | 28 (51) | |