TABLE.

Demographics and Clinical Information of Admission-Readmission Pairs With Imaging During Their Index Admission, 2018

Characteristic	Total (n = 275,860)	Nonfragmented/ same hospital (n = 182,085)	Same HIE (n = 12,641)	Different HIE (n = 20,006)	No HIE (n = 16,195)	Missing HIE (n = 44,933)	P
Age in years, mean (SD)	78.6 (9.0)	78.9 (9.0)	77.9 (8.8)	77.9 (8.7)	77.9 (8.7)	78.4 (8.9)	<.0001
Sex							<.0001
Female	54.0%	54.6%	51.4%	52.7%	52.5%	53.9%
Male	46.0%	45.4%	48.6%	47.3%	47.5%	46.1%
Race							<.0001
White	81.9%	83.1%	79.6%	77.9%	79.9%	80.2%
Black	12.4%	11.7%	14.9%	15.8%	14.1%	12.6%
Other	5.7%	5.2%	5.5%	6.3%	6.0%	7.2%
Alzheimer disease							.180
Yes	13.2%	13.3%	12.6%	13.0%	13.0%	13.1%
Charlson Comorbidity Index score, mean (SD)	3.9 (2.4)	4.0 (2.4)	4.0 (2.4)	3.8 (2.4)	3.8 (2.4)	3.8 (2.4)	<.0001
Urban/rural status							<.0001
Metropolitan	87.3%	87.4%	95.0%	91.1%	88.7%	82.4%
Micropolitan	9.4%	9.8%	3.5%	6.5%	8.4%	11.0%
Rural	3.3%	2.7%	1.5%	2.4%	2.9%	6.6%
Number of beds							<.0001
< 200	30.6%	28.4%	25.6%	28.4%	30.6%	42.1%
200-399	35.9%	36.6%	32.3%	33.0%	32.0%	37.0%
≥ 400	33.5%	35.1%	42.1%	38.5%	37.3%	20.9%
Hospital ownership							<.0001
Government	10.3%	10.6%	8.5%	10.2%	13.1%	8.6%
Religious	12.6%	12.4%	12.9%	12.3%	11.9%	13.3%
Nonprofit	60.3%	63.8%	67.0%	59.9%	56.2%	45.7%
For-profit	16.8%	13.1%	11.6%	17.6%	18.8%	32.3%
Hospital type							<.0001
General medical/surgical	98.8%	99.8%	96.7%	95.7%	96.0%	97.5%
Other	1.2%	0.2%	3.3%	4.2%	4.0%	2.5%
Teaching hospital	71.5%	72.8%	78.5%	74.9%	71.1%	62.7%	<.0001
Repeat imaging on the same body system	14.3%	14.0%	15.9%	15.8%	15.2%	14.4%	<.0001

HIE, health information exchange.