Table 3.

Risk factors for prolonged LOS.

	OR	95%CI	p-value
Univariate
Males/Females	0.75	0.57–0.98	0.035
Age	1.03	1.02–1.04	<0.001
Age >50	2.78	2.10–3.64	<0.001
BMI with every kg/m2	0.99	0.98–1.01	0.286
Obesity	0.98	0.67–1.44	0.928
ASA with every grade higher	1.67	1.33–2.10	<0.001
Smoking	1.29	0.89–1.88	0.179
Diabetes	3.96	2.45–6.40	<0.001
Symptoms <48 h vs. >48 h	1.72	1.29–2.29	<0.001
Alvarado	1.10	1.03–1.19	0.008
Leukocytosis	1.02	1.00–1.03	0.020
Leukocytosis >20,000/mm3	1.57	1.06–2.35	0.026
CRP	1.01	1.00–1.03	0.002
CRP >100	5.38	3.88–7.44	<0.001
No of appendectomies/year in department	0.73	0.55–0.97	0.029
Specialist vs. resident	1.47	1.11–1.94	0.007
Operative time	1.02	1.01–1.02	<0.001
Operative time/10 min	1.17	1.13–1.22	<0.001
Clipping	0.56	0.43–0.73	<0.001
Suturing/ligature	3.40	2.48–4.67	<0.001
Stapler	0.43	0.20–0.92	0.029
Endoloop	1.22	0.84–1.78	0.286
Röder loop	0.96	0.60–1.52	0.858
Complicated vs. uncomplicated	6.07	4.56–8.07	<0.001
Intraoperative adverse events	2.62	1.41–4.86	0.002
Postoperative morbidity	35.98	26.05–49.71	<0.001
Conversions	6.50	4.69–8.99	<0.001
Reinterventions after primary procedure	26.78	17.52–40.92	<0.001
Readmissions	3.52	2.06–6.02	<0.001
Multivariate
Males/Females	1.72	0.99–2.96	0.053
Age >50	1.74	0.90–3.38	0.099
ASA with every grade higher	1.11	0.66–1.86	0.688
Diabetes	1.06	0.37–3.00	0.918
Symptoms <48 h vs. >48 h	1.12	0.64–1.99	0.686
Alvarado	1.06	0.93–1.21	0.389
Leukocytosis >20,000/mm3	1.02	0.45–2.28	0.964
CRP >100	1.41	0.77–2.57	0.263
No of appendectomies/year in department	1.33	0.63–2.82	0.454
Complicated vs. uncomplicated	2.80	1.53–5.12	0.001
Intraoperative adverse events	2.49	0.85–7.31	0.096
Postoperative morbidity	5.01	2.33–10.75	<0.001
Conversions	6.48	3.48–12.08	<0.001
Reinterventions after primary procedure	8.79	3.20–24.14	<0.001