Reliability of ADDIS for diagnoses of substance use disorders according to ICD-10, DSM-IV and DSM-5: test-retest and inter-item consistency

BACKGROUND: This study investigates test-retest and inter-item consistency of Alcohol Drog Diagnos InStrument (ADDIS), a structured interview to diagnose substance use disorders according to ICD-10, DSM-IV and DSM-5. ADDIS, the Swedish version of SUDDS, is the only instrument in Swedish that produces diagnostic proposals specific to all drug categories, and for all three diagnostic systems. Screening of stressful life events, anxiety, and depression is also included. METHODS: Thirty patients at addiction treatment facilities were interviewed for diagnostic assessment and re-interviewed after one week. RESULTS: ADDIS has excellent internal consistency. There is also very high test-retest correlation on number of fulfilled criteria for all diagnostic systems. Agreement of diagnostic proposals is substantial, mean absolute agreement is excellent, and mean systematic correlation is almost perfect. CONCLUSION: ADDIS is a reliable tool for specific diagnostic assessment of SUDs.