Table 2.

Interobserver reliability for sonogram interpretation.

US parameter (n = 496 hips)	ICC	95%CI
Alpha angle	0.63	0.38–0.78
Beta angle	0.47	0.16–0.69
FHC	0.71	0.55–0.83

Graf type (n = 496 hips)	κ value	95%CI
Observer 1–Observer 2	0.19	0.03–0.35
Observer 1–Observer 3	0.39	0.20–0.58
Observer 2–Observer 3	0.17	0.02–0.32