Table 2.

Femoral head cover (%) of the normal hip at the time of diagnosis, and after 1, 3, and 5 years

Time	Femoral head cover
	Age < 6.0 years			Age > 6.0 years
	Mean	SD	LL	Mean	SD	LL
At diagnosis	98	7.4	83	96	6.1	84
1-year follow-up	98	6.2	86	95	5.5	84
3-year follow-up	96	5.9	84	94	7.8	78
5-year follow-up	93	6.6	80	92	7.4	77

LL: Lower limit of normal range (mean – 2 SD)