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Table 1 Patients’ demographic characteristics for SWD

From: Perioperative hypoalbuminemia is a risk factor for wound complications following posterior lumbar interbody fusion

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
  1. SWD Surgical wound dehiscence, BMI Indicates body mass index, SD Standard deviation, CNY Chinese Yuan, IQR Interquartile range
  2. *Statistically significant (P < 0.05)