Table 2

Demographic variables and self-report measures at the preoperative and 2-week postoperative baseline examinations

 Preoperative baseline2-Week postoperative baseline
General exerciseSpecific exerciseGeneral exerciseSpecific exercise
Age (years)40.2 (8.8)40.6 (10.2)
Body mass index28.3 (6.4)30.9 (7.3)
Sex (% female)47.055.2
Level of surgery (%)
 L3/L46.36.9
 L4/L525.027.6
 L5/S168.865.5
Prior LBP or sciatica (%)81.379.3
Time from episode onset to surgery (days)*132.0 (206.0)135 (143.5)
Symptoms distal to the knee (%)87.586.271.972.4
Able to work without restriction (%)35.532.125.010.4
Currently taking pain medication for back problem (%)90.377.859.475.9
Disability44.1 (13.8)42.8 (17.1)30.6 (15.9)31.4 (18.2)
Low back pain intensity3.8 (2.7)4.7 (2.3)2.5 (2.1)2.6 (1.9)
Leg back pain intensity5.8 (2.4)5.3 (2.7)1.8 (2.1)2.4 (2.2)
Sciatica frequency18.8 (4.0)17.7 (5.2)8.9 (5.3)10.6 (4.8)
Sciatica bothersomeness16.7 (5.0)15.7 (5.2)6.6 (5.6)7.0 (3.7)
Global rating of change4.6 (2.9)4.6 (2.8)
Muscle thickness change on side of surgery† (%)3.7 (7.5)0.5 (15.9)2.2 (4.7)3.8 (6.4)
Muscle thickness change contralateral to surgery† (%)4.5 (5.5)3.2 (6.6)3.7 (6.1)3.1 (4.9)
  • *Median (interquartile range).

  • †Measured at spinal level of surgery.

  • Values are mean (SD) unless otherwise specified.