TABLE 3.

The ratios for each area

Parameter	Type IVA (n = 48)			Type IVB (n = 41)			P *
	Affected	Unaffected	P	Affected	Unaffected	P
Ilium area	0.37 ± 0.03	0.39 ± 0.02	<0.001	0.39 ± 0.03	0.40 ± 0.03	<0.001	0.005
Acetabulum area	0.44 ± 0.04	0.40 ± 0.04	<0.001	0.42 ± 0.05	0.39 ± 0.05	<0.001	0.010
Ischium area	0.19 ± 0.02	0.21 ± 0.02	<0.001	0.19 ± 0.02	0.21 ± 0.03	<0.001	0.281

Values are expressed as the mean and standard deviation.

^* P value means the differences between the affected sides of type IVA and type IVB groups.