Table 2.

Patient data

Variable	N	Median	Mean	SD	Min.	Max.	Range
Age	147	2.3	2.9	1.8	1.5	11.2	9.7
AI 0	147	43.3	43.2	6.9	22.1	65.3	43.2
AI 1	147	24.4	24.3	8.8	0	48.1	48.1
AI 3 m	143	21.2	21.1	8.4	0	42.9	42.9
AI 6 m	143	19.7	19.9	8.6	−9.4	43.6	53
AI 12 m	141	19	18.4	6.8	4.3	36.4	32.1
AI 24 m	142	17	16.9	6.7	−4.2	37.2	41.4
Power of correction	147	18.4	18.9	9.4	2	58.5	56.5

AI 0 acetabular index before surgery, AI 1 acetabular index after surgery, AI 3 m acetabular index at 3 months, AI 6 m acetabular index at 6 months, AI 12 m acetabular index at 12 months, AI 24 m acetabular index at 24 months, Power of correction acetabular index before surgery − acetabular index after surgery