The development, validity, and reliability of the Addiction Profile Index (API)

Area of Science:

• Psychiatry
• Psychology
• Addiction Medicine

Background:

• Alcohol and substance abuse present complex challenges in assessment and treatment.
• A multidimensional tool is needed for comprehensive evaluation and effective treatment planning.

Purpose of the Study:

• To develop and validate the Addiction Profile Index (API), a practical questionnaire for assessing alcohol and substance abuse problems.
• To ensure the API is suitable for guiding addiction treatment planning.

Main Methods:

• The Addiction Profile Index (API) is a 37-item self-report questionnaire with 5 subscales: substance use characteristics, dependency diagnosis, effects of use, craving, and motivation to quit.
• Validity was assessed against established measures like MAST, SOCRATES, PACS, DCS, SCID-I, and ASI.
• The study involved 345 participants from addiction treatment clinics and a prison service.

Main Results:

• The API demonstrated high reliability (Cronbach's alpha = 0.89) and split-half reliability (0.83).
• Factor analysis identified 4 underlying factors explaining 52.3% of the variance.
• API subscales showed consistency with relevant measures (e.g., craving with PACS, motivation with SOCRATES).
• API total scores strongly correlated with MAST and ASI composite scores.
• ROC analysis indicated strong diagnostic accuracy (AUC = 0.90) with sensitivity of 0.85 and specificity of 0.78 at a cut-off of 4.

Conclusions:

• The Addiction Profile Index (API) is a valid and reliable instrument.
• The API effectively measures the severity of various dimensions of substance dependency.
• The API is a practical tool for both assessment and treatment planning in addiction services.