Table 3.

Adjusted Multivariable Analysis Showing Risk Factors for Unplanned Hospitalization

Variable	Coefficient	Hazard Ratio	95% CI	P
Age, years (v 66-69)
70-74	0.04	1.04	1.00 to 1.09	.058
75-79	0.06	1.07	1.02 to 1.12	.006
≥ 80	0.11	1.12	1.07 to 1.17	< .001
Sex: F (v M)	0.03	1.03	1.00 to 1.06	.073
Race (v white)
Hispanic	0.01	1.01	0.95 to 1.08	.689
Black	0.07	1.07	1.02 to 1.13	.007
American Indian	−0.22	0.80	0.53 to 1.22	.295
Other	−0.05	0.95	0.85 to 1.05	.323
Cancer type (v colon)
Esophageal	0.13	1.14	1.07 to 1.22	< .001
Liver or intrahepatic ductal	0.02	1.02	0.96 to 1.08	.517
Pancreatic	0.07	1.08	1.03 to 1.13	.001
Anorectal	−0.03	0.97	0.93 to 1.01	.171
Gastric	0.13	1.14	1.08 to 1.20	< .001
Disease stage (v localized)
Regional	0.23	1.26	1.22 to 1.31	< .001
Distant	0.29	1.34	1.28 to 1.40	< .001
Unknown	0.02	1.02	0.97 to 1.08	.384
Area of residence* (v big metropolis)
Metropolis	−0.04	0.97	0.93 to 1.00	.059
Urban	0.04	1.04	0.98 to 1.10	.201
Urban less	−0.01	0.99	0.95 to 1.04	.762
Rural	−0.01	0.99	0.89 to 1.10	.817
Census tract poverty level† (v Q1)
Q2	0.001	1.00	0.96 to 1.05	.972
Q3	0.05	1.05	1.00 to 1.10	.043
Q4	0.08	1.08	1.03 to 1.14	< .001
Charlson comorbidity index (v 0)
1	0.16	1.17	1.13 to 1.22	< .001
2	0.25	1.30	1.22 to 1.35	< .001
≥ 3	0.42	1.52	1.44 to 1.60	< .001
State buy in‡ (v none)	0.12	1.13	1.09 to 1.18	< .001

Abbreviation: Q, quartile.

^*Big metropolis, population ≥ 1,000,000; metropolis, population of < 250,000 to 1,000,000; urban, population of ≥ 20,000; urban less, population of 2,500 to 19,999; rural, population < 2,500.

^†Percentage of people living below the poverty line in the patient's census tract: Q1, 0.00%-7.48%; Q2, 7.49%-13.30%; Q3, 13.31%-21.04%; Q4, ≥ 21.05%.

^‡State buy-in variable is used to determine dual eligibility of patients for both Medicare and Medicaid.