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Table 1 Risk factors for surgical site infection

From: Surgical site infections after cesarean delivery: epidemiology, prevention and treatment

Variables Relative risk or odds ratios References
Subcutaneous hematoma 11.6 8
Chorioamnionitis 5.6-10.6 21-23
American Society of Anesthesiologists class of 3 or greater 5.3 21
Tabacco 5.3 22
Incision length > 16.6 cm 4.9 24
Prenatal visit <7 4 25
Body Mass Index >35 kg/m2 3.7 26
Corticosteroid 3.1 24
Body Mass Index >30 kg/m2 2.0-2.8 21, 23, 24, 26-28
Subcutaneous tissue thickness > 3 cm 2.8 29
Second stage (vs. first stage) 2.8 30
Teaching service 2.7 8
No antibiotic prophylaxis 2.6 25
Pregestational Diabetes 1.4-2.5 26, 28, 31
Operating time ≥ 38 min 2.4 27
Hypertensive disease/Preeclampsia 1.7-2.3 21, 28
Duration of labor >12 h 2.0 23
Nulliparity 1.8 21
Twin 1.6 28
Premature rupture of membrane 1.5 28
Gestational diabetes 1.5 32
Blood loss (every 100 ml) 1.3 21
Previous cesarean delivery 1.3 32
Emergency delivery 1.3 28
Rupture of mambranes (each hour) 1.02 25