Table 2 Adjusted Mixed Effects Logistic Regression Model^a with Surgical Site Infection as the Dependent Variable

SAP administration after cord clamping (Ref = before incision)

1.140

0.956

1.360

0.144

 30–40 years (Ref = < 30 years)

0.760

0.657

0.879

< 0.001

 > 40 years (Ref = < 30 years)

0.852

0.640

1.134

0.272

Contaminated wound (Ref = clean, contaminated)

1.270

1.074

1.503

0.005

 Cefazolin (Ref = Amoxicillin/clavulanate)

1.106

0.721

1.697

0.645

 Ceftriaxone (Ref = Amoxicillin/clavulanate)

0.939

0.544

1.619

0.821

 Cefuroxime (Ref = Amoxicillin/clavulanate)

1.031

0.687

1.547

0.882

Elective surgery (Ref = emergent)

0.574

0.488

0.676

< 0.001

 ASA 2 (Ref = ASA 1)

1.217

1.003

1.477

0.046

 ASA 3/4/5 (Ref = ASA 1)

1.326

0.952

1.846

0.095

Procedure duration (per 30 min increase)

1.330

1.189

1.488

< 0.001

 200–499 (Ref = < 200)

1.200

0.880

1.634

0.249

 500+ (Ref = < 200)

1.231

0.819

1.849

0.317

Procedure after Jan 2014 (Ref = before)

0.852

0.711

1.020

0.081