Table 2.

Association between survival of Spitzy operation (time from surgery to total hip arthroplasty) and preoperative variables

Variables		Survival (yrs)
		Mean	sd	p-value*
Age at Spitzy	< 12 yrs	42.2	8.0	0.015
	≥ 12 yrs	36.7	8.3
Preoperative centre-edge angle	< 10°	38.3	9.7	0.111
	10° to 17°	43.3	7.6
Preoperative hip pain	No pain	40.9	9.0	0.087
	Hip pain	36.1	8.7
Avascular necrosis (AVN)	No AVN	40.3	8.9	0.442
	AVN	38.0	9.7
Side	Unilateral	38.7	8.5	0.536
	Bilateral	40.1	8.7

^*data were analyzed with Independent samples t-test