Table 1 Patients’ demographic characteristics for SWD
Variable | Total (N = 554) | Surgical wound dehiscence (n = 69) | Normal wound healing (n = 485) | P value |
|---|---|---|---|---|
Preoperative baseline variables | ||||
 Age at surgery, mean (SD) | 56.9 (13.4) | 60.8 (14.2) | 56.4 (13.2) | 0.950 |
 BMI, mean (SD) | 24.1 (3.1) | 24.2 (3.8) | 24.1 (3.0) | 0.731 |
 Male | 237 (43) | 30 (43.5) | 207 (42.7) | 0.076 |
 Diabetes | 60 (10.8) | 9 (13.0) | 51 (10.5) | 0.965 |
 Smoker | 144 (26.0) | 22 (31.9) | 120 (25.2) | 0.573 |
 Chronic steroid use | 11 (1.99) | 5 (7.25) | 6 (1.24) | < 0.001 |
 Albumin level < 3.5 g/dl | 13 (2.35) | 6 (8.70) | 7 (1.44) | 0.001 |
 Diagnose | ||||
  Herniation | 270 (48.7) | 33 (47.8) | 237 (48.9) | - |
  Stenosis | 86 (15.5) | 12 (17.4) | 74 (15.3) | 0.053 |
  Spondylolisthesis | 198 (35.7) | 24 (34.8) | 174 (35.8) | 0.397 |
Operative variables | ||||
 Operative time, mean (SD), min | 160.8 (43.9) | 154.4 (48.5) | 161.8 (43.2) | 0.593 |
 Bleeding volume, mean (SD) mL | 318.5 (90.8) | 284.1 (30.4) | 311.4 (89.6) | 0.662 |
Postoperative variables | ||||
 Albumin level < 3.5 g/dl | 314 (56.7) | 56 (81.2) | 258 (53.2) | 0.023 |
 Albumin level < 3.0 g/dl | 110 (19.9) | 36 (52.2) | 74 (15.3) | 0.001 |
 Postoperative drainage median, ml, (IQR) | 223.5 (151.0–309.0) | 205.0 (120.0–300.0) | 231.0 (154.5–310.5) | 0.003 |
 Length of stay, day, median (SD) | 11.0 (9.0–14.0) | 17.0 (13.0–22.5) | 11.0 (9.0–13.0) | < 0.001 |
 Hospitalization expenses mean, thousand CNY (SD) | 25.6 (8.7) | 35.0 (17.5) | 24.2 (5.5) | < 0.001 |