Fig 3. Treatment groups (Tx).

Tx₀ = patients who were not actively engaged in OAT (control group). Tx₁ = patients who were actively engaged in OAT but had not received any additional mental health services from a physician. Tx₂ = patients who were actively engaged in OAT and had received mental health services from a psychiatrist during their active OAT episode of care. Tx₃ = patients who were actively engaged in OAT and had received mental health services from a primary care physician during their active OAT episode of care. Tx₄ = patients who were actively engaged in OAT and had received mental health services concurrently from a psychiatrist primary care physician during their active OAT episode of care.