Table 3.

Parameters of medullary canal for DDH and control groups

	ML width				AP width				D
	IVa	IVb	p	Normal	IVa	IVb	p	Normal	IVa	IVb	p	Normal
C+20	28.81 ± 4.07##	42.09 ± 6.99#	0.000**	50.05 ± 4.73	26.46 ± 4.38##	29.99 ± 3.95##	0.001**	34.40 ± 3.18	21.73 ± 3.76##	23.79 ± 2.05##	0.01**	29.87 ± 2.27
C+10	22.97 ± 5.58##	29.84 ± 8.1##	0.000**	35.51 ± 3.70	23.42 ± 3.82##	26.29 ± 3.78##	0.007**	30.74 ± 3.46	19.39 ± 3.03##	21.77 ± 2.77##	0.006**	26.77 ± 3.21
C0	16.68 ± 3.80##	23.71 ± 8.39##	0.000**	27.66 ± 3.08	20.48 ± 4.23##	23.30 ± 4.22##	0.034*	29.54 ± 5.35	15.77 ± 3.16##	18.38 ± 2.69##	0.002**	22.87 ± 3.02
C−10	13.23 ± 3.44##	17.73 ± 4.57##	0.000**	22.32 ± 2.86	16.55 ± 4.05##	18.62 ± 2.84##	0.117	24.11 ± 4.98	12.52 ± 3.08##	15.74 ± 2.52##	0.000**	19.80 ± 2.85
C−20	11.33 ± 3.37##	14.95 ± 3.70##	0.002**	19.10 ± 2.46	14.04 ± 3.42##	15.75 ± 2.02##	0.046*	18.75 ± 3.32	10.76 ± 2.89##	13.33 ± 2.52##	0.001**	17.77 ± 2.64
C−30	10.38 ± 2.70##	13.46 ± 3.10##	0.000**	16.91 ± 2.48	12.68 ± 3.28##	14.18 ± 2.30#	0.049*	16.05 ± 2.38	9.90 ± 2.67##	11.83 ± 2.11##	0.005**	15.69 ± 2.38
C−40	10.56 ± 2.96##	12.67 ± 2.97##	0.008**	15.19 ± 2.33	12.38 ± 3.09##	13.09 ± 2.27#	0.324	14.53 ± 2.23	9.55 ± 2.57##	10.80 ± 2.08##	0.051	14.06 ± 2.08
Ci	9.89 ± 2.48##	10.48 ± 1.89##	0.724	12.79 ± 1.80	11.13 ± 2.84##	11.47 ± 2.08#	0.598	12.79 ± 1.80	8.51 ± 1.98##	9.31 ± 2.12#	0.126	10.5 ± 1.41

Values are presented as the mean and the standard deviation; p means the differences between type IVa and type IVb DDH; *p < 0.05, **p < 0.01 for the comparison between the DDH groups; ^#p < 0.05, ^##p < 0.01, when compared with control group

ML width mediolateral width, AP width anteroposterior width, D diameter of best-fitting circle