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

Table 1 Biodemographic characteristics and hospitalization trends for 30 d readmissions of Crohn’s disease

Variable	Year
	2010	2012	2014	2016	2018
Number of readmissions	6202	6580	6475	8278	7672
Age (mean ± SE, yr)	41.8 ± 0.9	41.6 ± 1.1	41.2 ± 0.8	42.5 ± 0.7	43.9 ± 0.7
Gender (%)
Males	45.5	44.0	45.7	46.7	46.5
Females	54.5	56.0	54.3	53.3	53.5
Charlson comorbidity index score (%)
0	69.7	72.0	69.9	64.9	61.3
1	19.2	15.5	17.3	19.5	20.0
2	5.9	6.1	6.7	7.5	9.0
≥ 3	5.2	6.4	6.1	8.1	9.7
Insurance type (%)
Medicare	20.5	29.1	29.3	28.9	30.6
Medicaid	21.5	24.9	26.4	25.5	24.7
Private	41.2	37.1	37.0	40.8	39.0
Uninsured	8.8	8.9	7.3	4.8	5.7
Household income quartile (%)
1st	27.8	29.2	27.9	29.0	28.6
2nd	23.4	25.6	28.5	26.8	30.0
3rd	24.9	25.1	22.5	24.5	23.7
4th	23.9	20.1	21.1	19.7	17.7
Hospital characteristics
Hospital bed size (%)
Small	9.9	9.9	14.2	13.3	15.0
Medium	22.4	22.4	27.3	26.9	26.3
Large	67.7	67.7	58.5	59.8	58.7
Teaching status (%)
Metropolitan non-teaching	39.2	34.4	25.2	21.8	17.3
Metropolitan teaching	52.1	56.8	68.4	72.3	77.0
Non-metropolitan	8.7	8.8	6.4	5.9	5.7
Hospital volume quintiles (%)
Q1	1.8	1.9	1.5	1.7	1.3
Q2	4.3	5.4	5.1	4.2	4.5
Q3	10.3	10.0	10.2	8.4	10.4
Q4	19.4	18.1	18.1	18.6	19.1
Q5	64.2	64.6	65.1	67.1	64.7