An item response theory modeling of alcohol and marijuana dependences: a National Drug Abuse Treatment Clinical Trials Network study.
OBJECTIVE
The aim of this study was to examine psychometric properties of the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition (DSM-IV), diagnostics criteria for alcohol and marijuana dependences among 462 alcohol users and 311 marijuana users enrolled in two multisite trials of the National Drug Abuse Treatment Clinical Trials Network.


METHODS
Diagnostic questions were assessed by the DSM-IV checklist. Data were analyzed by the item response theory and the multiple indicators-multiple causes method procedures.


RESULTS
Criterion symptoms of alcohol and marijuana dependences exhibited a high level of internal consistency. All individual symptoms showed good discrimination in distinguishing alcohol or marijuana users between high and low severity levels of the continuum. In both groups, "withdrawal" appeared to measure the most severe symptom of the dependence continuum. There was little evidence of measurement nonequivalence in assessing symptoms of dependence by gender, age, race/ethnicity, and educational level.


CONCLUSIONS
These findings highlight the clinical utility of the DSM-IV checklist in assessing alcohol- and marijuana dependence syndromes among treatment-seeking substance users.
Department of Psychiatry and Behavioral Sciences, School of Medicine, Duke Clinical Research Institute, Duke University, Duke University Medical Center, Durham, North Carolina 27710, USA. litzy.wu@duke.edu
Li-Tzy
LT
Wu
Jeng-Jong
JJ
Pan
Dan G
DG
Blazer
Betty
B
Tai
Maxine L
ML
Stitzer
Robert K
RK
Brooner
George E
GE
Woody
Ashwin A
AA
Patkar
Jack D
JD
Blaine
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000437:Alcoholism / Q000145:classification* / Q000175:diagnosis*; D015982:Bias; D039721:Diagnostic and Statistical Manual of Mental Disorders; D005260:Female; D006801:Humans; D008297:Male; D002189:Marijuana Abuse / Q000145:classification* / Q000175:diagnosis*; D008960:Models, Psychological; D012307:Risk Factors; D012720:Severity of Illness Index; D013375:Substance Withdrawal Syndrome / Q000175:diagnosis