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Predictors for successful treatment outcome in patients with comorbid attention-deficit/hyperactivity disorder (ADHD) and substance use disorder (SUD): an international observational cohort study

INCAS: International Naturalistic Cohort Study of ADHD and Substance Use Disorders Study

Status
Active, not recruiting
Phases
Unknown
Study type
Observational
Source
ISRCTN
Registry ID
ISRCTN15998989
Enrollment
600
Registered
2020-02-06
Start date
2017-07-01
Completion date
Unknown
Last updated
2026-03-02

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Attention deficit hyperactivity/impulsivity disorder with comorbid substance use disorder Mental and Behavioural Disorders

Interventions

This study is non-interventional and investigates the treatment modalities provided to the study population at the participating treatment services. This study will invite 600 treatment-seeking patie

Sponsors

Beroendecentrum Stockholm
Lead Sponsor

Eligibility

Sex/Gender
All
Age
18 Years to 100 Years

Inclusion criteria

Inclusion criteria: 1. Men and women =18 years of age seeking treatment for SUD at any of the participating sites 2. ADHD diagnosis according to DSM-5 3. SUD diagnosis (DSM-5 moderate to severe, ICD-10 dependence)

Exclusion criteria

Exclusion criteria: There are no formal exclusion criteria except incapability to complete the assessments

Design outcomes

Primary

MeasureTime frame
1. Retention to treatment, defined as time to drop-out (last contact between patient and treatment center) 2. ADHD symptoms measured using the Adult ADHD Self-Report Scale (ASRS) at 3 months follow-up 3. Number of days with heavy alcohol use or days with illicit drug use during the last 30 days, measured using the Time-Line Follow-Back instrument at 3 months follow-up

Secondary

MeasureTime frame
1. ADHD symptoms measured using the adult ASRS at 9 months follow-up 2. Substance use measured with TLFB, defined as the number of days with heavy alcohol use or days with illicit drug use the last 30 days at 9 months follow-up. 3. ADHD symptoms according to the Expanded Adult ADHD Self-Report Scale at 3 and 9 months follow-up, respectively 4. Employment measured using questionnaire and patient files at baseline, 3 months and 9 months 5. Number of accidents as reported by the participant using questionnaire and patient files at baseline, 3 months and 9 months 6. Days with any alcohol use during the last 30 days measured using Timeline Follow-Back interview at baseline, 3 months and 9 months follow-up

Countries

Australia, Belgium, France, Germany, Hungary, Netherlands, Spain, Sweden, Switzerland, United States of America

Outcome results

None listed

Source: ISRCTN (via WHO ICTRP) · Data processed: Mar 14, 2026