Table 3.

Independent Predictors of 30-Day Readmission After Index Hospitalization with Takotsubo Syndrome.

Variables	Unadjusted OR	Lower CI	Higher CI	p Value	Adjusted OR *	Lower CI	Higher CI	p Value
Malignancy	1.53	1.34	1.75	<0.001	1.33	1.15	1.53	<0.001
Length of stay > 5 days	2.45	2.23	2.69	<0.001	1.48	1.31	1.68	<0.001
Age ≥ 70 yrs	1.34	1.22	1.46	<0.001	0.95	0.84	1.07	0.378
Diabetes mellitus	1.27	1.13	1.42	<0.001	1.14	1.01	1.28	0.035
Family hx of CAD	0.56	0.46	0.69	<0.001	0.78	0.63	0.97	0.024
Chronic pulmonary disease	1.69	1.54	1.86	<0.001	1.40	1.27	1.55	<0.001
Chronic Kidney disease	1.88	1.64	2.16	<0.001	1.36	1.17	1.59	<0.001
Anemia	1.90	1.70	2.12	<0.001	1.26	1.12	1.42	<0.001
Atrial fibrillation	1.61	1.43	1.81	<0.001	1.24	1.08	1.41	0.002
Fluid and electrolyte disturbance	1.75	1.58	1.92	<0.001	1.20	1.07	1.34	0.001
Median household income (Ref: 1st quartile)
Second quartile	0.92	0.80	1.04	0.188	0.97	0.85	1.11	0.689
Third quartile	0.83	0.72	0.94	0.004	0.90	0.79	1.03	0.10
Fourth quartile	0.75	0.66	0.85	<0.001	0.85	0.74	0.97	0.01
Primary payer (Ref: Medicare)
Medicaid	1.11	0.93	1.31	0.250	1.25	1.02	1.53	0.032
Private including HMO	0.53	0.46	0.60	<0.001	0.75	0.64	0.88	<0.001
Self-pay/no charge/other	0.61	0.50	0.74	<0.001	0.82	0.66	1.00	0.054
Disposition (Ref: Home)
Facility	2.60	2.35	2.87	<0.001	1.65	1.46	1.87	<0.001
AMA/unknown	0.37	0.22	0.62	<0.001	0.25	0.15	0.41	<0.001

Abbreviations: OR, odds ratio; CI, confidence interval; CAD, coronary artery disease; HMO, health maintenance organization; AMA, against medical advice. * A survey-specific multivariate generalized linear model was created with an outcome of 30-day readmission including all predictors with p values < 0.1 in the univariate analysis. Covariates for in hospital mortality and 30-day total mortality are available in the Tables S1 and S2.