Increasing thirty-day readmissions of Crohn’s disease and ulcerative colitis in the United States: A national dilemma

Table 2 Biodemographic characteristics and hospitalization trends for 30 d readmissions of ulcerative colitis

Variable	Year
	2010	2012	2014	2016	2018
Number of readmissions	3272	3399	3426	4449	4234
Age (mean ± SE, yr)	49.8 ± 1.6	49.6 ± 1.5	48.4 ± 1.1	49.9 ± 1.0	51.2 ± 0.8
Gender (%)
Males	48.1	45.6	47.5	46.7	49.4
Females	51.9	54.4	52.5	53.3	50.6
Charlson comorbidity index score (%)
0	57.8	59.6	60.6	55.6	50.9
1	20.3	20.0	18.6	19.4	20.7
2	9.4	9.0	8.5	10.6	10.3
≥ 3	12.5	11.4	12.3	14.4	18.1
Insurance type (%)
Medicare	36.3	36.6	32.4	35.1	34.8
Medicaid	17.8	17.0	22.3	17.5	19.5
Private	39.4	37.0	40.1	42.2	40.4
Uninsured	6.5	9.4	5.2	5.2	5.3
Household income quartile (%)
1st	25.5	29.2	26.5	27.2	25.0
2nd	22.5	23.1	25.9	27.5	26.7
3rd	26.4	24.6	22.9	25.0	26.1
4th	25.6	23.1	24.7	20.3	22.2
Hospital characteristics
Hospital bed size (%)
Small	10.2	9.8	13.2	13.5	16.8
Medium	19.8	22.4	26.8	25.7	24.3
Large	70.0	67.8	60.0	60.8	58.9
Teaching status (%)
Metropolitan non-teaching	37.3	38.2	26.1	24.5	19.3
Metropolitan teaching	53.6	53.5	67.7	70.3	76.3
Non-metropolitan	9.1	8.3	6.2	5.2	4.4
Hospital volume quintiles (%)
Q1	2.4	2.4	2.5	2.1	2.0
Q2	6.0	7.4	5.9	5.8	5.5
Q3	11.8	10.5	11.7	10.3	12.3
Q4	20.2	20.1	19.0	20.4	21.4
Q5	59.6	59.6	60.9	61.4	58.8