Table 2. Adjusted odds of mortality by hospital size/teaching status.

Variables	AOR	Standard error	p	(95% CI)
In-hospital mortality
Large teaching hospital	0.739	0.214	0.298	0.42-1.31
Weekend admission	1.305	0.360	0.335	0.76-2.24
Age	1.041	0.012	0.001	1.02-1.07
Female sex	1.181	0.311	0.529	0.70-1.98
Median annual income in patient's zip code, US$
46.000-58.999	1.005	0.332	0.988	0.53-1.92
59.000-78.999	0.706	0.258	0.342	0.35-1.43
>79.000	0.649	0.286	0.327	0.27-1.54
Race
Black	1.012	0.421	0.98	0.45-2.29
Hispanic	0.966	0.413	0.94	0.42-2.24
Higher Charlson index	1.249	0.062	<0.001	1.13-1.38
Early surgery (<24 hrs of admission)	1.064	1.594	0.967	0.06-20.09
Prolonged LOS (>12 days)	1.524	0.73	0.38	0.60-3.90
Any surgery	1.267	0.705	0.671	0.43-3.77
Delayed surgery (>5 days from admission)	1.708	1.981	0.644	0.18-16.59
Bowel gangrene^	27.725	11.405	<0.001	12.38-62.11
Anemias	2.151	0.576	0.004	1.27-3.64
Frailty	1.364	1.104	0.701	0.28-6.67
LOS: Length of hospital stay, AOR: Adjusted odds ratio, CI: Confidence interval. Including bowel damage with or without peritonitis.