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Impact of substance type and patient characteristics on the choice of treatment setting for substance use disorder in Belgium

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Abstract
Background Specialised addiction treatment centers (SAC) and general mental health centers (GMHC) both offer care to people with substance use disorders (SUD) in Belgium, but these sectors often operate in parallel, with little collaboration. This fragmented system may lead to inefficiencies, particularly in the treatment of individuals with dual diagnoses. Despite the recognized challenges, there is limited understanding of the factors that influence whether patients with SUD are treated in SAC or GMHC. Objectives This observational study has two main objectives: 1. To examine whether and how the primary substance of abuse influences the choice of either SAC or GMHC. 2. To assess whether other factors (e.g. sociodemographics, institution or person who orientated the patient to treatment) play a significant role in determining the type of center where the patient is treated. Methods The study used routinely collected data from treatment centers in Belgium from 2019 (Belgian Treatment Demand Indicator). Logistic regression evaluated the weight of drug use and sociodemographic variables for people entering treatment for SUD for the first time (n = 8322). A random forest algorithm was used to study all patients' orientation toward both sectors, across all treatment episodes (n = 29,658). Results The study found that the primary substance significantly influences sector choice. Patients using illicit substances like cannabis, opiates, cocaine, and stimulants are 6–12 times more likely to be treated in an SAC than those using alcohol. Factors such as income source and referral source (e.g. self-referral, general practitioner, etc) also significantly impact patient orientation. Conclusion These findings highlight the need for better integration between SAC and GMHC to adequately address the complex needs of people with SUD, especially with dual diagnosis.
Keywords
Substance use disorder, Treatment, Mental health care, Belgium, MENTAL-HEALTH-SERVICES, ALCOHOL, ADULTS, DRUG, COMORBIDITY, STIGMA

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MLA
Fernandez, Kim, et al. “Impact of Substance Type and Patient Characteristics on the Choice of Treatment Setting for Substance Use Disorder in Belgium.” JOURNAL OF SUBSTANCE USE & ADDICTION TREATMENT, vol. 168, 2025, doi:10.1016/j.josat.2024.209561.
APA
Fernandez, K., Antoine, J., Damian, E., Sinclair, D. L., Cosgrove, S., & Devleesschauwer, B. (2025). Impact of substance type and patient characteristics on the choice of treatment setting for substance use disorder in Belgium. JOURNAL OF SUBSTANCE USE & ADDICTION TREATMENT, 168. https://doi.org/10.1016/j.josat.2024.209561
Chicago author-date
Fernandez, Kim, Jérôme Antoine, Elena Damian, Deborah Louise Sinclair, Shona Cosgrove, and Brecht Devleesschauwer. 2025. “Impact of Substance Type and Patient Characteristics on the Choice of Treatment Setting for Substance Use Disorder in Belgium.” JOURNAL OF SUBSTANCE USE & ADDICTION TREATMENT 168. https://doi.org/10.1016/j.josat.2024.209561.
Chicago author-date (all authors)
Fernandez, Kim, Jérôme Antoine, Elena Damian, Deborah Louise Sinclair, Shona Cosgrove, and Brecht Devleesschauwer. 2025. “Impact of Substance Type and Patient Characteristics on the Choice of Treatment Setting for Substance Use Disorder in Belgium.” JOURNAL OF SUBSTANCE USE & ADDICTION TREATMENT 168. doi:10.1016/j.josat.2024.209561.
Vancouver
1.
Fernandez K, Antoine J, Damian E, Sinclair DL, Cosgrove S, Devleesschauwer B. Impact of substance type and patient characteristics on the choice of treatment setting for substance use disorder in Belgium. JOURNAL OF SUBSTANCE USE & ADDICTION TREATMENT. 2025;168.
IEEE
[1]
K. Fernandez, J. Antoine, E. Damian, D. L. Sinclair, S. Cosgrove, and B. Devleesschauwer, “Impact of substance type and patient characteristics on the choice of treatment setting for substance use disorder in Belgium,” JOURNAL OF SUBSTANCE USE & ADDICTION TREATMENT, vol. 168, 2025.
@article{01JC95EJEX2K1D065TS7737MH5,
  abstract     = {{Background
Specialised addiction treatment centers (SAC) and general mental health centers (GMHC) both offer care to people with substance use disorders (SUD) in Belgium, but these sectors often operate in parallel, with little collaboration. This fragmented system may lead to inefficiencies, particularly in the treatment of individuals with dual diagnoses. Despite the recognized challenges, there is limited understanding of the factors that influence whether patients with SUD are treated in SAC or GMHC.

Objectives
This observational study has two main objectives:
1. To examine whether and how the primary substance of abuse influences the choice of either SAC or GMHC.
2. To assess whether other factors (e.g. sociodemographics, institution or person who orientated the patient to treatment) play a significant role in determining the type of center where the patient is treated.

Methods
The study used routinely collected data from treatment centers in Belgium from 2019 (Belgian Treatment Demand Indicator). Logistic regression evaluated the weight of drug use and sociodemographic variables for people entering treatment for SUD for the first time (n = 8322). A random forest algorithm was used to study all patients' orientation toward both sectors, across all treatment episodes (n = 29,658).

Results
The study found that the primary substance significantly influences sector choice. Patients using illicit substances like cannabis, opiates, cocaine, and stimulants are 6–12 times more likely to be treated in an SAC than those using alcohol. Factors such as income source and referral source (e.g. self-referral, general practitioner, etc) also significantly impact patient orientation.

Conclusion
These findings highlight the need for better integration between SAC and GMHC to adequately address the complex needs of people with SUD, especially with dual diagnosis.}},
  articleno    = {{209561}},
  author       = {{Fernandez, Kim and Antoine, Jérôme and Damian, Elena and Sinclair, Deborah Louise and Cosgrove, Shona and Devleesschauwer, Brecht}},
  issn         = {{2949-8767}},
  journal      = {{JOURNAL OF SUBSTANCE USE & ADDICTION TREATMENT}},
  keywords     = {{Substance use disorder,Treatment,Mental health care,Belgium,MENTAL-HEALTH-SERVICES,ALCOHOL,ADULTS,DRUG,COMORBIDITY,STIGMA}},
  language     = {{eng}},
  pages        = {{8}},
  title        = {{Impact of substance type and patient characteristics on the choice of treatment setting for substance use disorder in Belgium}},
  url          = {{http://doi.org/10.1016/j.josat.2024.209561}},
  volume       = {{168}},
  year         = {{2025}},
}

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