Table 1.

Characteristics of AIH hospitalizations compared to non-AIH hospitalizations

Characteristics	Hospitalizations with a primary discharge diagnosis of AIH		Hospitalizations with a primary discharge diagnosis other than AIH		P-value
	N=9,258	%	N=186,735,489	%
Age, year					<0.01
<20	974	10.5%	31,934,862	17.1%
20–29	1,033	11.2%	18,398,533	9.9%
30–39	1,129	12.2%	17,664,332	9.5%
40–49	1,307	14.1%	17,503,655	9.4%
50–59	1,934	20.9%	23,736,255	12.7%
>60	2,871	31.0%	77,306,352	41.4%
Gender					<0.01
Male	1,781	19.3%	78,242,252	42.0%
Female	7,462	80.7%	108,122,937	58.0%
Race					<0.01
White	4,666	57.0%	108,128,364	66.3%
Black	1,463	17.9%	23,671,609	14.5%
Latino	1,556	19.0%	19,985,467	12.2%
Asian/Pacific Islander	142	1.7%	4,348,503	2.7%
Native American	39	0.5%	1,186,948	0.7%
Other	323	3.9%	5,869,158	3.6%
Payer					<0.01
Medicare	2,467	26.7%	71,033,950	38.1%
Medicaid	1,700	18.4%	37,604,643	20.2%
Private	3,757	40.7%	60,844,996	32.7%
Self-pay	780	8.4%	9,680,626	5.2%
No charge	107	1.2%	934,676	0.5%
Other	431	4.7%	6,212,517	3.3%
Residence					0.07
Central metro >1 mil	3,141	34.2%	55,322,790	30.3%
Fringe metro >1 mil	2,109	22.9%	43,674,800	23.9%
Metro 250 K–1 mil	1,643	17.9%	33,711,890	18.5%
Metro 50–250 K	778	8.5%	16,363,307	9.0%
Micropolitan	931	10.1%	20,254,333	11.1%
Not metro or micro	588	6.4%	13,342,430	7.3%
Zip code income					0.23
Bottom quartile	2,614	28.7%	53,066,594	29.1%
Second quartile	2,550	28.0%	47,129,097	25.9%
Third quartile	2,041	22.4%	43,601,863	23.9%
Top quartile	1,899	20.9%	38,425,941	21.1%
Region					0.72
East	1,694	18.3%	35,983,085	19.3%
Midwest	2,025	21.9%	42,493,242	22.8%
South	3,581	38.7%	71,512,373	38.3%
West	1,959	21.2%	36,746,789	19.7%

AIH, autoimmune hepatitis.