Table 1. Patient Demographics (Patient Encounters of Abdominal Pain).

	Encounters	%	Unique Patients	%
TOTAL	4,227,129		2,698,692
GENDER
Male	2,045,118	48.4	1,311,089	48.6
Female	2,181,830	51.6	1,389,235	51.5
RACE/ETHNICITY
White	1,944,955	47.6	1,232,862	45.7
Black	937,481	22.9	590,922	21.9
Hispanic	859,644	21.0	578,901	21.5
Asian	73,785	1.8	51,387	1.9
Other	272,424	6.7	198,880	7.4
PAYER
Public	2,134,716	51.7	1,350,498	50.0
Private	1,359,269	32.9	940,983	34.9
Self-Pay/Other	633,026	15.3	480,481	17.8
AGE
0–5	2,292,036	54.2	1,519,639	56.3
12-Jun	1,040,997	24.6	729,633	27.0
13–18	770,836	18.2	490,910	18.2
> = 19	123,255	2.9	77,156	2.9
MEDICAL OUTCOMES
Appendicitis	118,144	2.9	110,792	4.1
Death	17,493	0.4	17,487	0.6
ED	2,926,551	69.2	2,074,065	76.9
ED Readmissions 1	217,743	5.2	158,798	7.7
Hospitalization	1,434,933	34.0	932,240	34.5
Hopsitalization Readmissions 2	69,342	1.6	58,017	6.2
ICU	209,350	5.0	156,739	5.8
OR Visit	462,135	10.9	369,536	13.7
PAST MEDICAL HISTORY
Asthma	808,061	19.1	361,469	13.4
Obesity	108,397	2.6	41,290	1.5
Diabetes	75,154	1.8	33,277	1.2
Cystic Fibrosis	38,713	0.9	9,217	0.3
Malnutrition	153,486	3.6	34,266	1.3
Cerebral Palsy	152,685	3.6	40,825	1.5
Prematurity	19,212	0.5	5,664	0.2
Mental Illness	226,231	5.4	73,420	2.7
HOSPITAL REGION
Northeast	559,004	13.5	356,403	13.2
Midwest	1,313,080	31.7	781,619	29.0
South	1,039,987	25.1	681,546	25.3
Southwest	506,940	12.3	348,169	12.9
West	720,822	17.4	472,828	17.5

¹ Calculated as percentage of those in ED

² Calculated as percentage of those in hospital