Table 2.

Univariate Analysis of Variables Associated With 90-Day Readmission Among Persons Who Inject Drugs With Invasive Infections

	90-Day Readmission
Variable	OR	95% CI	P
Patient demographic characteristics
Age >50 years	1.09	.59–2.02	.452
Female	1.23	.77–1.96	.230
African American	.79	.49–1.27	.334
Homeless	.92	.46–1.83	.475
Substance use history
Prior IDU-related infection	1.99	1.18–3.36	.006
Heroin or fentanyl	.69	.32–1.46	.217
Cocaine	1.53	.90–2.60	.075
Methamphetamine	1.32	.78–2.25	.184
Benzodiazepine	.49	.09–2.45	.307
Comorbidities
Hypertension	1.47	.72–2.98	.188
Psychiatric comorbidity	.79	.37–1.73	.355
Diabetes mellitus	.73	.28–1.86	.334
Hepatitis C infection	.88	.54–1.43	.343
HIV infection	2.14	.66–6.92	.158
Infection characteristics
Infective endocarditis	1.27	.79–2.04	.190
Septic arthritis	.60	.31 –1.18	.093
Isolated bacteremia	1.41	.62–3.21	.269
Osteomyelitis	.69	.42–1.15	.095
Epidural abscess	.91	.44–1.89	.475
Bacteremia	1.02	.64–1.64	.516
Staphylococcus aureus infection	.89	.55–1.47	.378
Admission characteristics
Addiction medicine consult	.39	.24–.64	<.001
Antibiotic treatment group
Completed inpatient IV	Reference
Partial IV, partial oral	1.05	.58–1.83	.491
Partial IV, no oral	4.77	2.55–8.92	.004
Received surgical procedure	.38	.23–.62	<.001

Abbreviations: CI, confidence interval; HIV, human immunodeficiency virus; IDU, injection drug use; IV, intravenous; OR, odds ratio.