Table 2 The mean differences of (VAS for back pain) between pre-operative and post-operative assessments in four time periods
Study variables | Periods of assessment | N | Mean | SD | P-value |
|---|---|---|---|---|---|
VAS for back pain | VAS for back pain preoperatively | 30 | 7.66 | 0.75 | < 0.001* |
VAS for back pain 1 weeks postoperatively | 30 | 2.20 | 0.40 | ||
VAS for back pain 3 months postoperatively | 30 | 0.43 | 0.50 | ||
VAS for back pain 6 months postoperatively | 30 | 0.23 | 0.43 | ||
VAS for back pain 12 months postoperatively | 30 | 0.20 | 0.40 |