Table 1 Comparison of demographic characteristics
|  | Groups | χ2/Z/t | P | |
|---|---|---|---|---|
Refractured (n = 33) | No-refractured (n = 59) | |||
Gender (n) | Â | Â | 0.012 | 0.912 |
 Males | 11 (33.3) | 19 (32.2) |  |  |
 Females | 22 (66.7) | 40 (67.8) |  |  |
Age (years) | 74.27 ± 8.10 | 75.29 ± 8.51 | 0.558 | 0.578 |
BMI (kg/m2) | 22.65 ± 2.11 | 22.55 ± 2.14 | − 0.318 | 0.751 |
Preoperative BMD (T) | − 3.83 ± 0.63 | − 3.65 ± 0.66 | 1.245 | 0.216 |
Follow-up duration (days) | 215.12 ± 79.47 | 265.24 ± 91.90 | / | |