Table 4.

Comparison of the median maximum contact pressure (in megapascals) among the three pelvic positions

Group	Standard positiona	Supine position			Standing position
	Median (range)	Median (range)	Difference of mediansb	p valueb	Median (range)	Difference of mediansc	p valuec
Hip dysplasia (n = 32)	7.4 (4.3-15)	5.8 (3.5-12)	-1.1	< 0.001	7.3 (4.1-14)	-0.1	> 0.99
Control (n = 16)	3.2 (2.2-4.5)	2.5 (2.0-3.2)	-0.7	< 0.001	3.5 (2.2-4.4)	0.1	0.84
p valued	< 0.001	< 0.001			< 0.001

^aStandard pelvic position was defined as that where the CT scanner coordinate system matches the anterior pelvic plane coordinate system.

^bSupine versus standard position.

^cStanding versus standard position.

^dHip dysplasia versus control group.