Table 3.

Cox proportional Hazard Model for re-operation after first lumbar disc herniation surgery.

	Hazard Ratio	95% Confidence Interval *	p-value
Female sex	1.47	0.19 to 11.19	0.71
Age, years	0.98	0.92 to 1.04	0.53
Body mass index >27.0	1.62	0.42 to 6.29	0.36
Duration of pain, mo	1.01	0.98 to 1.02	0.66
Back pain per 10 mm on VAS	1.17	0.88 to 1.54	0.27
Leg pain per 10 mm on VAS	1.01	0.73 to 1.40	0.94
Leisure time physical activity	1.09	0.93 to 1.28	0.28
Employment	1.16	0.00 to >50	0.96