Table 2.

Compare the PI between DDH (Crowe type I-III) group and the non-DDH control group. DDH (Crowe type I-III) group has a significantly greater PI than the non-DDH control group. Patients with Crowe type I has a significantly greater PI than the non-DDH control group

Classification	PI (°)a
Non-DDH Control Group	44.2 (8.8; 41.8–46.6)
DDH (Crowe Type I-III) Group	47.6 (8.2; 45.6–49.9) b
Crowe Type I	48.2 (7.6; 45.2–51.2) c
Crowe Type II	49.6 (9.6; 44.0–55.1)
Crowe Type III	44.0 (7.4; 39.3–48.7)

^a Values express mean (SD; 95%CI)

^b Significant differences between the DDH (Crowe type I-III) group and the non-DDH controls group at 0.05 level

^c Significant differences between patients with Crowe type I and the non-DDH control group at 0.05 level