Table 4.

Multivariate analysis of risk factors associated with responder rate.

	HR	95% CI	P-value
Gender (male)	0.76	0.43–1.36	0.36
Age	0.99	0.96–1.01	0.31
ASA	1.13	0.74–1.75	0.57
Length of hospital stay	1.14	0.88–1.49	0.31
Surgical experience (Senior)	1.67	0.90–3.11	0.11
Operative time	1.00	0.99–1.01	0.97
Pain medication preop	1.00	0.99–1.00	0.22
EQ-5D preop	0.09	0.02–0.45	0.003

HR = Hazard Ratio, CI = Confidence Interval, preop = preoperative, ASA = American Society of Anaesthesiologists.