Table 2.

Summary of shifts by BMI cohort

	All	BMI ⩽ 25	BMI > 25	p
Absolute shift [mean ± SD (mm)]
x-axis	4.9 ± 4.6	4.7 ± 4.5	4.9 ± 4.7	0.29
y-axis	6.9 ± 6.2	5.6 ± 5.9	7.6 ±6.2	<0.001*
z-axis	6.2 ± 7.4	4.9 ± 5.6	5.6 ± 6.2	<0.001*
3D	12.1 ± 8.7	4.9 ± 5.9	6.8 ± 7.9	<0.001*
Directional shift [mean ± SD (mm)]
x-axis	−1.8 ± 6.6	−1.9 ± 6.3	−1.0 ± 6.7	<0.001*
y-axis	−4.5 ± 8.1	−3.3 ± 7.5	−5.2 ± 8.3	<0.001*
z-axis	−1.9 ± 9.5	0.3 ± 7.7	−3.0 ± 10.0	<0.001*
3D	12.2 ± 8.7	10.4 ± 7.8	13.1 ± 8.9	<0.001*

Abbreviations: 3D = 3-dimensional; SD = standard deviation.