Table 4.
Summary of statistical analysis
| Variables | Non-fracture (N = 493) |
Fracture (N = 7) |
p value |
|---|---|---|---|
| Age | 0.187 | ||
| Mean (SD) | 68.61 (10.73) | 74.00 (7.53) | |
| Median (Q1, Q3) | 70.0 (64.0, 75.0) | 71.0 (68.0, 79.0) | |
| N (% Non-missing) | 493 (100.0%) | 7 (100.0%) | |
| BMI | 0.468 | ||
| Mean (SD) | 28.61 (4.78) | 27.29 (3.86) | |
| Median (Q1, Q3) | 29.0 (25.0, 32.0) | 29.0 (23.0, 31.0) | |
| N (% Non-missing) | 380 (77.1%) | 7 (100.0%) | |
| Offset | 0.537 | ||
| Mean (SD) | 44.13 (4.31) | 45.14 (3.89) | |
| Median (Q1, Q3) | 44.0 (41.0, 48.0) | 45.0 (42.0, 47.0) | |
| N (% Non-missing) | 493 (100.0%) | 7 (100.0%) | |
| Side | 1.000 | ||
| Right | 273 (55.4%) | 4 (57.1%) | |
| Left | 220 (44.6%) | 3 (42.9%) | |
| Gender | 0.704 | ||
| Female | 318 (64.5%) | 4 (57.1%) | |
| Male | 175 (35.5%) | 3 (42.9%) | |
| Femoral Stem Size | 0.685 | ||
| 1 | 26 (5.3%) | 0 (0.0%) | |
| 2 | 66 (13.4%) | 1 (14.3%) | |
| HO2 | 78 (15.8%) | 2 (28.6%) | |
| 3 | 65 (13.2%) | 0 (0.0%) | |
| HO3 | 101 (20.5%) | 1 (14.3%) | |
| 4 | 37 (7.5%) | 2 (28.6%) | |
| HO4 | 79 (16.0%) | 1 (14.3%) | |
| 5 | 4 (0.8%) | 0 (0.0%) | |
| HO5 | 26 (5.3%) | 0 (0.0%) | |
| 6 | 7 (1.4%) | 0 (0.0%) | |
| 7 | 4 (0.8%) | 0 (0.0%) | |
| Barack classification | 0.340 | ||
| A | 326 (66.1%) | 3 (42.9%) | |
| B | 149 (30.2%) | 4 (57.1%) | |
| D | 12 (2.4%) | 0 (0.0%) | |
| Unknown* | 6 (1.2%) | 0 (0.0%) | 0.686 |
| Alignment | |||
| Neutral | 335 (68.0%) | 5 (71.4%) | |
| Right | 106 (21.5%) | 1 (14.3%) | |
| Left | 46 (9.3%) | 1 (14.3%) | |
| Unknown* | 6 (1.2%) | 0 (0.0%) |
T tests used for continuous variables and Fisher’s exact test used for categorical variables
HO high offset stem
*Unknown: six patients died before 12-month follow-up radiographs were obtained