Table 1.
Baseline demographics and clinical characteristics for all patients.
| All patients (n = 96) | Group without RA (n = 65) | RA group (n = 31) | |
|---|---|---|---|
| Age (years), mean (SD) | 74.1 (7.8) | 75.8 (7.0) | 70.5 (8.2) |
| Body weight (kg), mean (SD) | 46.0 (7.8) | 46.2 (7.3) | 45.4 (6.4) |
| Body mass index (kg/m2), mean (SD) | 21.0 (2.7) | 21.3 (2.8) | 20.5 (2.4) |
| Presence of previous fragility fractures, n (%) | 51 (53.1) | 38 (58.5) | 13 (41.9) |
| Lumbar spine T score, mean (SD) | −3.2 (1.4) | −3.2 (1.4) | −3.1 (1.3) |
| Total hip T score, mean (SD) | −2.6 (1.2) | −2.7 (1.0) | −2.4 (1.6) |
| Lumbar spine BMD (L2–L4, g/cm2), mean (SD) | 0.739 (0.166) | 0.737 (0.172) | 0.744 (0.156) |
| Total hip BMD (g/cm2), mean (SD) | 0.604 (0.114) | 0.604 (0.118) | 0.605 (0.108) |
| Femoral neck BMD (g/cm2), mean (SD) | 0.598 (0.107) | 0.594 (0.112) | 0.606 (0.097) |
| Femoral shaft BMD (g/cm2), mean (SD) | 0.707 (0.144) | 0.710 (0.147) | 0.702 (0.138) |
| Hand BMD (g/cm2), mean (SD) | 0.255 (0.048) | 0.263 (0.048) | 0.238 (0.046) |
| CSMI (mm3), mean (SD) | 5440.4 (1710.7) | 5435.0 (1797.1) | 5451.7 (1541.6) |
| CSA (mm2), mean (SD) | 84.1 (16.0) | 83.8 (16.6) | 84.9 (14.8) |
| SM (cm3), mean (SD) | 332.1 (90.7) | 331.0 (95.7) | 334.4 (80.7) |
| BR, mean (SD) | 5.0 (1.8) | 5.1 (2.0) | 4.7 (1.3) |
| Neck CW (mm), mean (SD) | 3.7 (1.4) | 3.8 (1.5) | 3.7 (1.1) |
| Shaft CW (mm), mean (SD) | 3.6 (1.4) | 3.7 (1.7) | 3.4 (0.6) |
| FSI, mean (SD) | 1.4 (0.4) | 1.3 (0.3) | 1.5 (0.5) |
RA: rheumatoid arthritis; SD: standard deviation; BMD: bone mineral density; CSMI: cross-sectional moment of inertia; CSA: cross-sectional area; SM: section modulus, BR: buckling ratio; CW: cortical width; FSI: femoral strength index.