Clinical and surgery-related outcomes for biportal endoscopy laminectomy during 12-month follow-up.
| Variables | Group 1, Age≥85 y | Group 2, Age <85 y | P a |
| VAS back | <0.001 | ||
| Preoperation | 60.92 (25.29) | 52.86 (28.31) | |
| 3 mo | 23.92 (23.16) | 29.00 (27.96) | |
| 6 mo | 27.40 (23.28) | 27.59 (23.55) | |
| 12 mo | 29.20 (25.22) | 26.07 (25.14) | |
| Group effect | 0.720 | ||
| VAS lower extremities | <0.001 | ||
| Preoperation | 64.92 (28.84) | 58.81 (27.69) | |
| 3 mo | 30.00 (27.78) | 26.00 (34.20) | |
| 6 mo | 32.60 (28.56) | 26.90 (31.06) | |
| 12 mo | 35.00 (31.64) | 26.79 (33.34) | |
| Group effect | 0.612 | ||
| ODI | <0.001 | ||
| Preoperation | 53.54 (18.00) | 55.50 (13.83) | |
| 3 mo | 34.25 (19.67) | 41.87 (20.93) | |
| 6 mo | 37.38 (18.50) | 39.28 (22.30) | |
| 12 mo | 36.72 (18.26) | 36.50 (23.04) | |
| Group effect | 0.805 | ||
| EQ-5D | <0.001 | ||
| Preoperation | 0.45 (0.21) | 0.40 (0.19) | |
| 3 mo | 0.70 (0.20) | 0.65 (0.25) | |
| 6 mo | 0.67 (0.21) | 0.65 (0.27) | |
| 12 mo | 0.69 (0.20) | 0.69 (0.28) | |
| Group effect | 0.617 | ||
| painDETECT | <0.001 | ||
| Preoperation | 14.53 (7.83) | 11.93 (7.06) | |
| 3 mo | 5.36 (6.46) | 3.83 (4.11) | |
| 6 mo | 5.15 (5.77) | 5.14 (5.37) | |
| 12 mo | 5.23 (5.48) | 5.18 (5.31) | |
| Group effect | 0.126 | ||
| Complications, n (%)b | |||
| Incidental durotomy | 9 (14%) | 6 (14%) | >0.99 |
| Hematoma | 4 (6%) | 2 (5%) | >0.99 |
| Surgical site infection | 1 (2%) | 0 | >0.99 |
| Revision surgery due to recurrence | 0 | 1 (2%) | 0.393 |
| Delirium | 4 (6%) | 3 (7%) | >0.99 |
| Pneumonia | 2 (3%) | 1 (2%) | >0.99 |
| Surgery-related outcomes | |||
| Operation time, min | 82.11 (30.37) | 85.87 (31.70) | 0.549 |
| Hospital stay, d | 5.25 (1.95) | 8.16 (16.24) | 0.168 |
| Intraoperative blood loss, mL | 98.14 (100.19) | 131.94 (144.00) | 0.182 |
| Postoperative drainage, mL | 130.92 (157.47) | 142.71 (119.96) | 0.694 |
Abbreviations: EQ-5D, European Quality of Life-5 Dimensions; ODI, Oswestry disability index; VAS, visual analog scale.
Data are presented as given as mean (SD) unless otherwise indicated.
↵a P values are from Generalized Estimating Equations: (1) Overall P values indicate the time effect over 12 months. (2) Group effect P values compare Groups 1 and 2 differences over 12 months.
↵b Fisher’s exact test was used.