Table 5: Multivariable regression for hospital admission after emergency department presentation.

Variable	No. hospital admissions	No. visits	% (95% CI)	Adjusted* OR (95% CI)
HIV status
Non-HIV	3703	38 670	9.6 (9.3-9.9)	1.00
HIV	1513	9670	15.6 (14.9-16.4)	1.55 (1.43-1.69)
Income quintile
5 (highest)	746	7055	10.6 (9.9-11.3)	1.00
4	728	7310	10.0 (9.3-10.6)	0.96 (0.85-1.08)
3	891	8455	10.5 (9.9-11.2)	0.98 (0.87-1.10)
2	1115	10 530	10.6 (10.0-11.2)	0.98 (0.88-1.09)
1 (lowest)	1681	14 506	11.6 (11.1-12.1)	1.00 (0.90-1.11)
Residence
Urban	4906	44 352	11.1 (10.8-11.4)	1.00
Rural	306	3926	7.8 (7.0-8.6)	1.13 (0.97-1.32)
Aggregated diagnosis groups
0-5	2717	30 728	8.8 (8.5-9.2)	1.00
6-9	1523	11 901	12.8 (12.2-13.4)	1.31 (1.22-1.41)
≥ 10	976	5711	17.1 (16.1-18.1)	1.69 (1.53-1.87)
CTAS score
Nonurgent	23	2326	1.0 (0.6-1.4)	1.00
Less urgent	260	15 153	1.7 (1.5-1.9)	1.84 (1.25-2.70)
Urgent	2329	21 222	11.0 (10.6-11.4)	12.08 (8.31-17.57)
Emergent	2396	9195	26.1 (25.2-27.0)	34.38 (23.60-50.09)
Resuscitation	199	328	60.7 (55.4-66.0)	156.73 (101.34-236.9)
Emergency department volume
Low	175	2316	7.6 (6.5-8.6)	1.00
Medium	753	8656	8.7 (8.1-9.3)	0.63 (0.52-0.77)
High	4288	37 368	11.5 (11.2-11.8)	0.61 (0.50-0.74)
Teaching hospital
No	3112	31 914	9.8 (9.4-10.1)	1.00
Yes	2104	16 426	12.8 (12.3-13.3)	1.12 (1.04-1.20)

Note: CI = confidence interval, CTAS = Canadian Triage and Acuity Scale, OR = odds ratio.

*Adjusted for HIV status, neighborhood income quintile, urban versus rural residence, number of primary care visits in the past year and comorbidity burden in the past year, CTAS score, emergency department volume and teaching versus nonteaching hospital.