Skip to main content

Table 2 Patients’ demographic characteristics for SSI

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

Variable Total (N = 554) SSI (n = 19) No-SSI (n = 535) P value
Preoperative baseline variables
 Age at surgery, mean (SD) 56.9 (13.4) 56.7 (16.0) 56.9 (13.3) 0.010
 BMI, mean (SD) 24.1 (3.1) 23.9 (3.9) 24.1 (3.1) 0.750
 Male 237 (43) 12 (63.2) 225 (42.1) 0.900
 Diabetes 60 (10.8) 2 (10.5) 58 (10.8) 0.300
 Smoker 144 (26.0) 6 (31.6) 138 (25.8) 0.235
 Chronic steroid use 11 (1.99) 5 (26.3) 6 (1.1) 0.003
 Albumin level < 3.5 g/dl 13 (2.35) 3 (15.8) 10 (1.9) 0.001
 Diagnose
  Herniation 270 (48.7) 6 (31.6) 264 (49.3) -
  Stenosis 86 (15.5) 6 (31.6) 80 (15.0) 0.180
  Spondylolisthesis 198 (35.7) 7 (36.8) 191 (35.7) 0.001
Operative variables
 Operative time, mean (SD), min 160.8 (43.9) 155.5 (48.2) 161.0 (43.8) 0.178
 Bleeding volume, mean (SD) mL 318.5 (90.8) 321.1 (105.7) 311.9 (89.2) 0.537
Postoperative variables
 Albumin level < 3.5 g/dl 314 (56.7) 16 (84.2) 298 (55.7) < 0.001
 Albumin level < 3.0 g/dl 110 (19.9) 10 (52.6) 100 (18.7) < 0.001
 Postoperative drainage median, ml, (IQR) 223.5 (151.0–309.0) 148 (93.0-188.0) 231 (154.0–312.0) 0.116
 Length of stay, day, median, thousand CNY (SD) 11.0 (9.0–14.0) 22.0 (14.0–32.0) 11.0 (9.0–14.0) < 0.001
 Hospitalization expenses mean (SD) 25.6 (8.7) 43.9 (21.3) 24.9 (7.2) < 0.001
  1. SSI Surgical site infection, BMI Indicates body mass index, SD Standard deviation, CNY Chinese Yuan, IQR Interquartile range
  2. *Statistically significant (P < 0.05)