Defining treatment response in gambling disorder

Area of Science:

• Psychiatry and Behavioral Science
• Clinical Psychology
• Addiction Medicine

Background:

• Gambling disorder is a prevalent global mental health concern.
• Validated instruments exist for measuring symptom severity but lack established treatment response thresholds.
• Determining treatment efficacy requires objective benchmarks for clinical and research use.

Purpose of the Study:

• To establish optimal thresholds for treatment response in gambling disorder using validated symptom severity measures.
• To identify cutoffs on the Yale-Brown Obsessive-Compulsive Scale Modified for Pathological Gambling (PG-YBOCS) and the Gambling Symptom Assessment Scale (GSAS) that correlate with treatment success.
• To provide evidence-based benchmarks for assessing treatment outcomes in clinical practice and research.

Main Methods:

• Aggregated data from 553 participants in prior clinical trials for gambling disorder.
• Utilized baseline and end-of-study symptom severity scores from PG-YBOCS and GSAS.
• Performed Receiver Operator Characteristic (ROC) analyses with Clinical Global Impression Improvement (CGI-I) as the reference standard to determine optimal thresholds.

Main Results:

• Optimal thresholds for treatment response were identified as >50% improvement in PG-YBOCS and >35% improvement in GSAS.
• The PG-YBOCS cutoff demonstrated high sensitivity (85.0%) and specificity (83.0%) with an AUC of 0.904.
• The GSAS cutoff showed acceptable sensitivity (81.2%) and specificity (73.4%) with an AUC of 0.859.

Conclusions:

• This study provides the first established thresholds for treatment response on the PG-YBOCS and GSAS for gambling disorder.
• These validated thresholds can aid clinicians in assessing individual patient treatment progress.
• The findings will also standardize outcome measures in future clinical trials for gambling disorder.