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Table 2 The mean differences of (VAS for back pain) between pre-operative and post-operative assessments in four time periods

From: Open fenestration discectomy versus microscopic fenestration discectomy for lumbar disc herniation: a randomized controlled trial

Study variablesPeriods of assessmentNMeanSDP-value
VAS for back painVAS for back pain preoperatively307.660.75< 0.001*
VAS for back pain 1 weeks postoperatively302.200.40
VAS for back pain 3 months postoperatively300.430.50
VAS for back pain 6 months postoperatively300.230.43
VAS for back pain 12 months postoperatively300.200.40
  1. Friedman Test, P ≤ 0.05 was significant