METHODS

A retrospective case-control study of data from individuals who had an emergency CS procedure performed between 1st January 2017 and 31st December 2017 at Pinderfields General Hospital, Wakefield; part of the Mid Yorkshire NHS Hospitals Trust was conducted. Following written approval, data was collected from the electronic databases used by the Mid Yorkshire Maternity department, comprising data of all patients seen and treated by Pinderfields obstetrics department.
Inclusion criteria were:
Exclusion criteria were:
The following variables were collected: grade of CS (categorised as 1-4), smoking status (categorised as current smoker, ex-smoker or non-smoker), whether or not a pre-operative vaginal swab was taken, diabetes status (categorised as non-diabetic, Type I, Type II or gestational), grade of surgeon (categorised as registrar, specialist trainee, consultant, senior house officer (SHO) or associate specialist), patient age, patient body mass index (BMI), membrane rupture to delivery interval and length of surgery.
The sample was summarised descriptively. A series of uni-variable logistic regression screening analyses were conducted on the outcome of SSI status to identify variables substantively associated with the outcome (p <0.200); with low-frequency categories of certain variables combined where appropriate. All such variables were carried forward into a corresponding multiple logistic regression analysis. All analyses reported unadjusted or adjusted odds ratios with associated 95% confidence intervals, P-value and the percentage of correct classifications.