Table 2.
Summary of shifts by body mass index.
| Variable | All patients | BMI < 30 | BMI ≥ 30 |
|---|---|---|---|
| AP shift (n, %) | |||
| <7 mm | 420 (91.9%) | 147 (97.4%) | 273 (89.2) |
| ≥7 mm | 37 (8.1%) | 4 (2.6%) | 33 (10.8%) |
| SI shift (n, %) | |||
| <7 mm | 428 (93.7%) | 145 (96.0%) | 283 (92.5%) |
| ≥7 mm | 29 (6.3%) | 6 (4.0%) | 23 (7.5%) |
| Lateral shift (n, %) | |||
| <7 mm | 425 (93.0%) | 151 (100.0%) | 274 (89.5%) |
| ≥7 mm | 32 (7.0%) | 0 (0.0%) | 32 (10.5%) |
| Absolute AP shift (mm) | |||
| Mean (SD) | 2.77 (2.47) | 1.94 (1.63) | 3.18 (2.70) |
| Absolute SI shift (mm) | |||
| Mean (SD) | 2.25 (2.23) | 2.19 (2.00) | 2.27 (2.33) |
| Absolute lateral shift (mm) | |||
| Mean (SD) | 2.76 (2.57) | 1.70 (1.32) | 3.28 (2.86) |
Abbreviations: BMI, body mass index; SD, standard deviation; AP, anterior–posterior; SI, superior–inferior.