Table 3.

Unadjusted and multilevel models with random effects for relative risks and 95% CIs for association of ICE income measure and survival to discharge among Medicare beneficiaries

	ICE income model 1 unadjusted		ICE income model 2 (beneficiary)		ICE income model 3 (beneficiary + hospital)
Variable	RR	95% CI	RR	95% CI	RR	95% CI
ICE income Q1 (low income)	Ref	Ref	Ref	Ref	Ref	Ref
ICE income Q2	1.11	1.05–1.16	1.07	1.03–1.12	1.07	1.02–1.12
ICE income Q3	1.13	1.08–1.18	1.08	1.03–1.13	1.06	1.01–1.12
ICE income Q4	1.08	1.04–1.13	1.03	0.99–1.08	1.03	0.99–1.09
ICE income Q5 (high income)	1.12	1.07–1.17	1.05	1.0–1.10	1.06	1.0–1.11
Sex: female	–	–	Ref	Ref	Ref	Ref
Sex: male	–	–	1.07	1.04–1.10	1.07	1.04–1.10
Individual White race	–	–	Ref	Ref	Ref	Ref
Individual Black race	–	–	0.82	0.79–0.85	0.84	0.80–0.87
Age category 65–74 y	–	–	Ref	Ref	Ref	Ref
Age category 75–84 y	–	–	0.90	0.88–0.93	0.90	0.88–0.93
Age category 85 + y	–	–	0.85	0.82–0.88	0.85	0.82–0.89
Elixhauser AHRQ Comorbidity Index < 0	–	–	Ref	Ref	Ref	Ref
Elixhauser AHRQ Index = 0	–	–	0.72	0.67–0.78	0.72	0.67–0.78
Elixhauser AHRQ Index = 1–4	–	–	0.80	0.74–0.86	0.79	0.73–0.85
Elixhauser AHRQ Index ≥ 5	–	–	0.62	0.59–0.65	0.63	0.60–0.66
Hospital size: no. of beds < 100	–	–	–	–	Ref	Ref
Hospital size: no. of beds > 100–399	–	–	–	–	0.86	0.80–0.93
Hospital size: no. of beds ≥ 400	–	–	–	–	0.83	0.76–0.91
Hospital teaching status: major academic teaching	–	–	–	–	Ref	Ref
Hospital teaching status: minor academic teaching	–	–	–	–	1.05	1.0–1.11
Hospital teaching status: non-teaching	–	–	–	–	1.11	1.05–1.18
Hospital medical intensive care unit beds (no)	–	–	–	–	Ref	Ref
Hospital medical intensive care unit beds (yes)	–	–	–	–	0.92	0.85–1.01
Hospital cardiac intensive care beds (CIC) (no)	–	–	–	–	Ref	Ref
Hospital cardiac intensive care beds (CIC) (yes/no)	–	–	–	–	0.99	0.95–1.03
Hospital cardiac catheterization availability (no)	–	–	–	–	Ref	Ref
Hospital cardiac catheterization availability (yes)	–	–	–	–	1.14	1.07–1.20

Ref = Reference Category