Table 1

Baseline characteristics of study population by day of procedure

 MondayTuesdayWednesdayThursdayFridaySaturdaySunday
n=404 (%)n=524 (%)n=537 (%)n=518 (%)n=465 (%)n=463 (%)n=412 (%)p Value*
Age (years)
 <1621.823.921.321.823.318.817.6
 16–5064.662.763.164.163.565.269.8
 >5013.613.415.714.113.216.012.70.136
Female47.347.950.852.548.350.142.70.422
ASA III/IV3.11.81.71.64.13.63.00.138
Earliest Antibiotics
 None3.56.66.47.26.75.96.4
 Preoperative/induction84.576.678.279.676.179.765.7
 Intraoperative/postoperative12.016.815.413.217.214.427.90.003
Preoperative imaging
 None71.364.965.763.369.564.873.5
 USS15.822.720.323.417.222.515.5
 CT12.912.414.013.313.312.710.90.022
Time of operation
 Daytime (0800–1800)56.558.857.360.259.560.264.2
 Evening (1800–2200)21.922.322.522.423.222.519.0
 Night (2200–0800)21.618.920.217.417.317.316.80.020
Initial laparoscopic approach68.165.369.368.067.165.960.00.056
Consultant presence in theatre23.224.326.828.323.523.217.60.046
Duration of surgery >60 min45.649.748.550.452.951.147.00.342
Drain placed13.111.610.411.811.011.99.00.199
Skin closure
 Subcutaneous77.680.578.181.283.081.185.7
 Interrupted suture/clips18.317.418.715.715.515.612.0
 Glue4.02.13.23.11.53.32.20.003
Intra-abdominal wash used65.361.663.757.763.762.069.90.281
Histopathology
 Simple45.350.053.148.149.950.161.4
 Complex†27.224.825.123.723.926.619.2
 Normal22.020.617.724.921.721.415.5
 Other5.44.64.13.34.51.93.90.001
Adverse events
 30-day adverse event13.611.314.99.314.011.913.30.950
 Wound infection3.02.54.51.75.22.64.60.226
 Pelvic abscess2.53.24.11.51.92.82.70.433
 Unplanned 30-day imaging10.99.012.17.710.17.87.50.049
 Laparoscopic converted9.17.910.58.513.112.112.60.022
  • Figures are shown as percentages, with raw figures presented in the online supplementary table S2.

  • 2 test.

  • †Perforation, gangrene and/or abscess

  • ASA, American Society of Anaesthesiologists.