Table 1.

Patient demographics and pre-, peri- and post-operative factors

Patient demographics
Age (mean (±SD), years)	36.7 (±19.68)
Female (n (%))	177 (41.84)
Male (n (%))	246 (58.16)
ASA ≥ 2 (n (%))	180 (48.13)
CCI ≥ 3 (n (%))	37 (8.75)
Pre-operative factors
Patients requiring CT (n (%))	206 (48.70)
CT peri-appendiceal change (n (%))	173 (83.98)
CT peri-appendiceal collection (n (%))	22 (10.67)
CT free fluid (n (%))	91 (44.17)
CT free gas (n (%))	33 (16.02)
CT faecolith (n (%))	83 (40.29)
Time from admission to surgery (mean (±SD), hours)	19.4 (±46)
Peri-operative factors
Suppurative appendix (n (%))	30 (7.10)
Gangrenous appendix (n (%))	76 (17.97)
Perforated appendix (n (%))	269 (63.59)
Abscess (n (%))	89 (21.04)
Post-operative factors
Histology: inflamed (n (%))	9 (2.13)
Histology: suppurative (n (%))	31 (7.33)
Histology: gangrenous and perforated (n (%))	383 (90.54)
Length of post-operative IV antibiotics (mean (±SD), days)	4.3 (±1.78)
Patients receiving post-operative oral antibiotics (n (%))	104 (24.59)
Length of post-operative oral antibiotics (mean (±SD), days)	6.2 (±2.69)
Post-operative IAA (n (%))	23 (5.44)
Laparoscopic washout (n (%))	18 (4.23)
Length of stay (mean (±SD), days)	5.3 (±2.22)
Readmission (n (%))	37 (8.75)

ASA American Society of Anesthesiologists; CCI Charlson Comorbidity Index; CT Computed tomography