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Average distances (in mm) from correct placement in vertical and horizontal planes.
| Vertical plane | Mean (SD) | Horizontal plane | Median (IQR) |
| V1 | 12.94 (18.42) | V1 | 13 (12) |
| V2 | 19.75 (19.82) | V2 | 15 (11) |
| V3 | -8.85 (20.33) | V3 | 7 (12) |
| V4 | 19.48 (17.23) | V4 | 17 (19) |
| V5 | -18.12 (18.83) | V5 | 0 (23) |
| V6 | 13.69 (21.29) | V6 | 0 (18) |
IQR = interquartile range; SD = standard deviation.
