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Table 1 Sociodemographic and clinical characteristics of the patients at the time of their first operation for lumbar disc herniation.

From: Reoperations after first lumbar disc herniation surgery; a special interest on residives during a 5-year follow-up

  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) -