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Table 3 Binary logistic regression model for the development of ASSI after lumbar surgery

From: Risk factors for acute surgical site infections after lumbar surgery: a retrospective study

Risk factors Exp (B) (95% C.I. of Exp (B)) p
Patient-related risk factors Age (year) 0.729(0.544–0.976) 0.34
Sex 0.000(0.000–2.294) 0.074
BMI (kg/m2) 2.888(1.059–7.875) 0.038
Smoking (year) 1.684(1.008–2.813) 0.047
Drink wine 2.180(0.241–9.771) 0.121
Academic career 3.337(0.012–9.383) 0.265
Diabetes mellitus 2.200(0.046–1.102) 0.020
COPD 0.000 0.987
Osteoporosis 1.842(0.151–4.836) 0.044
Nutritional status 0.000(0.000–162.412) 0.220
Fracture 2.916(0.156–5.308) 0.001
Hypertension 0.011(0.00–13.221) 0.213
Long-term use of hormone 0.551(0.151–4.836) 0.105
Procedure-related risk factors Preoperative antibiotics 2.030(0.005–5.216) 0.025
Operative type 1.374(0.010–4.445) 0.035
Operative incision (cm) 1.027(0.555–1.899) 0.993
Operative time (min) 1.014(0.987–1.042) 0.030
Blood loss (ml) 1.022(0.999–1.045) 0.024
Number of internal fixation metals (piece) 22.589(0.891–572.990) 0.059
Intraoperative blood transfusion 0.000(0.000–0.417) 0.413
Drainage tube (root) 0.019(0.000–11.327) 0.225
Time of draining (day) 4.983(1.641–15.140) 0.033
Capacity draining (ml) 1.008(0.990–1.025) 0.392
  1. DM, osteoporosis, COPD, preoperative antibiotics, fracture and operative type are classification variables; BMI, smoking, operative time, blood loss, operative incision, capacity draining, and time of draining are continuous variables (Sig./p < 0.05 was considered to be statistically significant. Exp (B) >1 were risk factors and <1 were protective factors). Italicized value is statistically different