Impact of index admission cholecystectomy vs interval cholecystectomy on readmission rate in acute cholangitis: National Readmission Database survey

Table 4 Independent predictors of 30-d readmission for patients with gallstone-related acute cholangitis with interval cholecystectomy

	Bivariate logistic regression			Multivariate logistic regression
	Adjusted HR	95%CI	P value	Adjusted HR	95%CI	P value
Female	1.01	0.82-1.25	0.88	0.87	0.80-0.94	< 0.01
Age (mean)	1.01	0.99-1.01	< 0.14	0.99	0.98-0.99	< 0.01
Charlson comorbidity index
1			Reference
2	1.47	1.06-2.04	0.12	-	-	-
3 or more	2.49	1.89-3.27	< 0.01	1.27	1.22-1.32	< 0.01
Median income based on the zip code
$1-$38999			Reference
$39000-$47999	0.98	0.74-1.30	0.92	-	-	-
$48000-$62999	0.96	0.72-1.29	0.83	-	-	-
> $63000	0.89	0.65-1.21	0.47	-	-	-
Primary payer
Medicare			Reference
Medicaid	0.76	0.52-1.12	0.17	1.06	0.92-1.22	0.38
Private	0.68	0.52-0.90	< 0.01	0.97	0.87-1.09	0.69
Others	0.51	0.26-1.12	0.05	0.91	0.67-1.24	0.57
Comorbidities
Diabetes mellitus	1.45	1.11-1.91	< 0.01	0.93	0.85-1.03	0.2
Hypertension	1.24	1.01-1.52	0.03	1.00	0.92-1.09	0.88
Chronic kidney disease	1.1	1.04-1.16	< 0.01	0.99	0.97-1.02	0.71
End stage renal disease	3.31	2.03-5.39	< 0.01	1.41	1.15-1.73	< 0.01
Congestive heart failure	2.37	1.85-3.02	< 0.01	1.06	0.96-1.18	0.19
Chronic obstructive pulmonary disease	1.5	1.18-1.91	< 0.01	0.95	0.85-1.05	0.32
Hospital teaching status
Non-teaching			Reference
Teaching	1.11	1.03-1.20	< 0.01	0.98	0.84-1.15	0.85
Hospital bed size
Small			Reference
Medium	1.08	0.98-1.21	0.11	1.02	0.90-1.17	0.66
Large	1.23	1.12-1.35	< 0.01	1.12	1.01-1.26	0.03
Hospital location
Rural			Reference
Urban	1.13	1.03-1.25	< 0.01	1.06	0.89-1.27	0.49
Complications
Intensive care unit	1.98	1.38-2.83	< 0.01	1.01	0.79-1.29	0.74
Acute respiratory failure	2.45	1.46-4.11	< 0.01	1.13	0.85-1.49	0.38
Septic shock	1.23	0.49-3.09	< 0.64	1.29	0.93-1.80	0.12

CI: Confidence interval; HR: Hazard ratio.