Table 1.

Association between painless period postoperatively and preoperative variables in hips with follow-up ten or more years

Variables		Univariable analysis			Multivariable linear regression
		Painless period (yrs)
		Mean	sd	p-value*	p-value
Age at Spitzy	< 12 yrs	19.9	11.9	0.947
	≥ 12 yrs	20.2	14.9
Preoperative centre-edge angle	< 10°	14.3	7.3	0.033	0.069
	10° to 17°	24.3	16.8
Preoperative hip pain	No pain	22.1	12.0	0.311
	Hip pain	17.6	14.9
Avascular necrosis (AVN)	No AVN	21.9	13.5	0.032	0.139
	AVN	11.3	7.4

^*univariable analysis was performed with Independent samples t-test