Table III.

Risk factors for postoperative intraabdominal abscess

Parameter	OR	95% CI	P-value
Univariate analysis:
Male	2.02	1.11–3.66	0.020
Age > 35 years	1.93	1.10–3.37	0.022
Obesity	1.31	0.56–3.05	0.531
ASA class	1.27	0.77–2.09	0.346
Smoking	1.10	0.50–2.41	0.807
Diabetes mellitus	3.46	1.35–8.87	0.010
Symptoms > 48 h	2.47	1.40–4.34	0.002
With every point of Alvarado grading higher	1.15	1.01–1.31	0.032
Alvarado ≥ 7	2.12	1.13–3.97	0.019
CRP > 100 mg/l	4.70	2.58–8.54	< 0.001
> 50 appendectomies/year in department	1.70	0.85–3.41	0.135
Residents vs. specialists	0.75	0.43–1.31	0.312
Purulent appendicitis	0.25	0.14–0.44	< 0.001
Gangrenous appendicitis	2.84	1.61–5.00	< 0.001
Perforated/autoamputated appendix	7.63	4.00–14.56	< 0.001
Intraoperatively diagnosed periappendiceal abscess	6.51	3.69–11.49	< 0.001
Complicated appendicitis	6.49	3.54–11.90	< 0.001
Drainage	5.11	1.58–16.49	0.006
Conversions	1.26	0.45–3.51	0.664
Multivariate analysis:
Male	0.68	0.33–1.39	0.289
Age > 35 years	0.92	0.43–1.95	0.827
Diabetes mellitus	2.59	0.82–8.23	0.106
Symptoms > 48 h	1.23	0.59–1.44	0.584
Alvarado ≥ 7	1.90	0.90–4.00	0.091
CRP > 100 mg/l	1.32	0.61–2.86	0.483
Complicated appendicitis	2.98	1.10–8.04	0.031
Intraoperatively diagnosed periappendiceal abscess	1.47	0.59–3.65	0.403