A cohort study evaluating the association between concurrent mental disorders, mortality, morbidity, and continuous treatment retention for patients in opioid agonist treatment (OAT) across Ontario, Canada, using administrative health data

Table 2 All-cause mortality, acute care use and treatment retention in patient groups

	Patients, N	Outcome	Effect	95% CI
All-cause mortality		n (%)
Mental disorders	48,679	2485 (5.1)	OR 1.4	1.2–1.5
+No mental disorders	7245	227 (3.1)
ED visits		Mean (SD)
Mental disorders	48,679	22.0 (30.9)	IRR 2.3	2.2–2.3
+No mental disorders	7245	9.8 (10.2)
Hospitalizations		Mean (SD)
Mental disorders	48,679	5.0 (6.8)	IRR 1.1	1.6–1.7
+No mental disorders	7245	3.0 (6.8)
*One-year treatment retention		n (%)
Mental disorders	23,268	8758 (37.6)	HR 1.0	0.9–1.1
+No mental disorders	2,532	903 (35.7)

SD standard deviation, OR adjusted odds ratio, IRR incidence rate ratio, HR adjust hazard ratio
+ Reference group
*Ontario Drug Benefit Plan subgroup analysis (n = 28,500)

ISSN: 1477-7517