Table 3.
Comparison of DXA and TBS measurements in different patient subgroups.
| Total N = 265 |
Male N = 49 |
Female N = 216 |
||||||
|---|---|---|---|---|---|---|---|---|
| Mean (SD) | Median | Mean (SD) | Median | Mean (SD) | Median | p Value | ||
| Total | ||||||||
| T-score L1–L4 | −1.11 (1.60) | −1.25 | −1.44 (1.53) | −1.30 | −1.04 (1.61) | −1.20 | 0.107 | |
| T-score femoral neck | −1.30 (1.11) | −1.40 | −1.83 (1.09) | −2.00 | −1.17 (1.09) | −1.30 | <0.001 | |
| T-score femur | −1.23 (1.16) | −1.30 | −1.57 (1.12) | −1.65 | −1.15 (1.15) | −1.30 | 0.021 | |
| TBS T-score | −2.23 (1.43) | −2.10 | −1.82 (1.49) | −1.70 | −2.32 (1.40) | −2.20 | 0.034 | |
| TBS Z-score | −0.27 (1.25) | −0.20 | −0.63 (1.31) | −0.50 | −0.18 (1.22) | −0.10 | 0.045 | |
| TBS value | 1.25 (0.13) | 1.27 | 1.25 (0.15) | 1.26 | 1.25 (0.12) | 1.27 | 0.774 | |
| Glucocorticoid therapy | ||||||||
| T-score L1–L4 | −1.02 (1.59) | −1.20 | −1.28 (1.50) | −1.20 | −0.92 (1.64) | −1.20 | 0.496 | |
| T-score femoral neck | −1.25 (1.06) | −1.40 | −1.46 (1.02) | −1.90 | −1.18 (1.07) | −1.30 | 0.434 | |
| T-score femur | −1.08 (0.96) | −1.20 | −1.20 (1.01) | −1.30 | −1.05 (0.96) | −1.00 | 0.666 | |
| TBS T-score | −2.36 (1.53) | −2.15 | −1.58 (1.73) | −1.30 | −2.62 (1.39) | −2.30 | 0.079 | |
| TBS Z-score | −0.51 (1.43) | −0.20 | −0.75 (1.34) | −0.50 | −0.44 (1.47) | −0.15 | 0.537 | |
| TBS value | 1.24 (0.14) | 1.27 | 1.28 (0.19) | 1.31 | 1.23 (0.12) | 1.26 | 0.440 | |
| Rheumatic diseases | ||||||||
| T-score L1–L4 | −0.62 (1.64) | −0.80 | −1.11 (1.88) | −0.90 | −0.50 (1.58) | −0.80 | 0.364 | |
| T-score femoral neck | −1.10 (1.09) | −1.20 | −1.61 (1.28) | −2.00 | −1.00 (1.04) | −1.05 | 0.205 | |
| T-Score femur | −0.92 (1.08) | −1.00 | −1.22 (0.96) | −1.30 | −0.86 (1.10) | −1.00 | 0.335 | |
| TBS T-score | −2.11 (1.49) | −2.15 | −1.88 (1.94) | −2.00 | −2.16 (1.39) | −2.15 | 0.669 | |
| TBS Z score | −0.13 (1.32) | 0.00 | −0.59 (1.41) | −0.20 | −0.03 (1.30) | 0.05 | 0.298 | |
| TBS value | 1.27 (0.14) | 1.27 | 1.26 (0.20) | 1.25 | 1.27 (0.13) | 1.27 | 0.935 | |
| Endocrine diseases | ||||||||
| T-score L1–L4 | −1.04 (1.78) | −1.00 | −1.28 (1.51) | −1.40 | −0.98 (1.86) | −0.95 | 0.556 | |
| T-score femoral neck | −1.12 (1.32) | −1.30 | −1.47 (1.19) | −1.50 | −1.02 (1.34) | −1.30 | 0.253 | |
| T-score femur | −1.19 (1.37) | −1.20 | −1.31 (1.29) | −1.10 | −1.16 (1.40) | −1.30 | 0.721 | |
| TBS T-score | −2.23 (1.58) | −2.00 | −1.24 (0.99) | −1.00 | −2.50 (1.60) | −2.20 | 0.001 | |
| TBS Z-score | −0.62 (1.23) | −0.35 | −0.26 (0.91) | −0.10 | −0.72 (1.30) | −0.40 | 0.233 | |
| TBS value | 1.26 (0.14) | 1.28 | 1.32 (0.11) | 1.34 | 1.24 (0.14) | 1.27 | 0.053 | |
| Elderly patients/primary osteoporosis | ||||||||
| T-score L1–L4 | −1.31 (1.48) | −1.40 | −1.75 (1.47) | −1.60 | −1.22 (1.47) | −1.40 | 0.136 | |
| T-score femoral neck | −1.42 (1.02) | −1.60 | −2.12 (0.98) | −2.10 | −1.28 (0.98) | −1.40 | 0.001 | |
| T-score femur | −1.34 (1.08) | −1.45 | −1.83 (1.10) | −1.80 | −1.24 (1.06) | −1.30 | 0.024 | |
| TBS T-score | −2.26 (1.35) | −2.10 | −2.07 (1.54) | −1.80 | −2.30 (1.31) | −2.20 | 0.519 | |
| TBS Z-score | −0.19 (1.21) | −0.20 | −0.75 (1.48) | −0.60 | −0.06 (1.11) | −0.10 | 0.045 | |
| TBS value | 1.25 (0.12) | 1.26 | 1.21 (0.15) | 1.23 | 1.26 (0.11) | 1.27 | 0.149 | |
p value from Welch test to compare the distributions between males and females. DXA = Dual Energy X-ray Absorptiometry; TBS = trabecular bone score; L1-4 = lumbar vertebral body 1-4. The T-score/Z-score indicates how much the measured bone density deviates from the bone density of young, healthy adults/of the corresponding age group.