Table 1 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 | 7.73 | 0.78 | < 0.001* |
VAS for back pain 1 weeks postoperatively | 30 | 3.70 | 0.46 | ||
VAS for back pain 3 months postoperatively | 30 | 1.73 | 0.44 | ||
VAS for back pain 6 months postoperatively | 30 | 0.23 | 0.43 | ||
VAS for back pain 12 months postoperatively | 30 | 0.06 | 0.25 |