Systematic Assessment of Gambling Type Involvement: Reliability and Validity of the Gambling Disorder Identification...

Area of Science:

• Psychology
• Psychometrics
• Public Health

Background:

• Assessing gambling type involvement and diversity is crucial for understanding problem gambling.
• Systematic measurement procedures for gambling diversity are currently scarce.
• Online gambling is increasingly prevalent and may be associated with higher problem gambling rates.

Purpose of the Study:

• To evaluate the psychometric performance of the gambling type assessment within the Gambling Disorder Identification Test (GDIT).
• To examine test-retest reliability, convergent validity, and gambling diversity patterns using the GDIT.
• To compare these measures across help-seeking and general population gambling samples.

Main Methods:

• The study involved 603 participants from help-seeking and general population gambling samples.
• Psychometric properties including test-retest reliability (ICC and r_tet) were assessed for specific gambling types.
• Convergent validity was examined by correlating gambling participation with GDIT total scores (symptom severity).
• Configural frequency analysis explored typical and atypical gambling diversity patterns.

Main Results:

• Test-retest reliability for specific gambling types varied (ICC 0.32-0.64, r_tet 0.66-0.85).
• Online gambling showed stronger correlations with GDIT scores than land-based gambling.
• Slots gambling demonstrated the highest correlation with symptom severity (r=0.52), followed by casino table games, sports/horse betting, and poker. Lotteries showed no correlation.
• Higher gambling diversity, particularly involving slots, was linked to severe gambling disorder.

Conclusions:

• The Gambling Disorder Identification Test (GDIT) is a reliable and valid tool for assessing gambling participation and diversity.
• Engagement in specific gambling types, especially online slots, is significantly associated with problem gambling severity.
• The GDIT can be integrated into broader measurement strategies for problem gambling and gambling disorder.