| Date |
| ||||
| before OP (n = 458) | after OP (n = 458) | Difference | |||
Variable | mean | s.d. | mean | s.d. | mean | s.d. |
SESAM | 5.48 | 1.15 | 1.28 | 0.50 | 4.20 | 1.17 |