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Table 4 The mean differences of (VAS for leg 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 preoperatively309.530.50< 0.001*
VAS for back pain 1 weeks postoperatively301.330.47
VAS for back pain 3 months postoperatively300.460.50
VAS for back pain 6 months postoperatively300.000.00
VAS for back pain 12 months postoperatively300.000.00