Table 1.

Sociodemographic and clinical characteristics of the patients at the time of their first operation for lumbar disc herniation.

	Single operated N = 149	Re-operated N = 17	P-value
Number of males	86 (58)	8 (47)	0.40
Age, years, mean (SD)	42 (12)	41 (14)	0.70
Height, cm, mean (SD)	173 (9)	172 (8)	0.61
Body mass index, mean (SD)	26 (4)	26 (3)	0.76
Duration of back pain, months, median (IQR)	10 (3, 24)	12 (6, 117)	0.11
Duration of leg pain, months, median (IQR)	6 (3, 14)	10 (3, 15)	0.19
Intensity of pain before operation, VAS, median (IQR)
Back pain	59 (34, 82)	76 (50, 86)	0.070
Leg pain	74 (58, 90)	76 (61, 94)	0.45
Leisure time physical activity, h/week, median (IQR)	3.5 (1.0, 6.8)	5.5 (2.9, 7.5)	0.29
Employment status, no (%):			0.48
Employed	109 (73.2)	12 (70.6)
Unemployed	10 (6.7)	3 (17.6)
Student	8 (5.4)	1 (5.9)
Retired	18 (12.1)	1 (5.9)
Other	4 (2.7)	-