Table 4.

Cox Proportional Hazard Multivariate Regression Model for ED Visit or Hospital Readmission within 1 Year of Index Visit

Variable	Males (n = 247)		Females (n = 153)
	HR	95% CI	HR	95% CI
Age	1.09	(0.97, 1.23)	1.11	(1.00, 1.22)
Race and ethnicity
American Indian or Native American	1.17	(0.50, 2.72)	1.07	(0.37, 3.10)
Asian or Pacific Islander	2.31	(0.99, 5.39)	0	— a
Hispanic	0.57	(0.27, 1.21)	0.52	(0.12, 2.18)
Non-Hispanic Black	1.42	(0.90, 2.25)	1.25	(0.74, 2.13)
Non-Hispanic White		Reference		Reference
Unknown	0.63	(0.25, 1.58)	0.69	(0.21, 2.25)
Housing status
Homelessb		Reference		Reference
Transitional/supportive housing	1.20	(0.59, 2.42)	0.82	(0.38, 1.75)
Private address	2.64	(1.73, 4.01)**	2.34	(1.42, 3.83)**
With injury diagnosis	0.90	(0.60, 1.34)	1.74	(1.06, 2.85)*
With acute medical condition diagnosis	1.59	(1.09, 2.32)*		—

HR = hazard ratio, CI = confidence interval, ED = emergency department

Note. Two patients who died during their index admission were not included in this model. Variables were obtained from patients’ index ED visit or index hospital admission.

^aNo ED visit or hospital readmission within 1 year for this subgroup; 95% CI not applicable.

^bIncludes “homeless” or “none”, youth shelter or center, adult shelter or women's shelter, community service center/day program, substance use or mental health center, church, and unknown.

^*p < 0.05

^**p < 0.01