Opiate Treatment Index
The Opiate Treatment Index (OTI) is a structured interview designed to provide a measure of the effectiveness of drug treatments. The OTI measures 6 treatment outcomes; drug use, HIV risk-taking behaviour, social functioning, criminality, health status and psychological functioning. The OTI in its complete from takes 20-30 minutes to complete. In some studies, only selected components of the instrument are administered. The drug use questions allow the calculation of a quantity/frequency estimate (Q score), through the addition of consumption amounts on the two previous days and dividing this value by the time intervals between days.
Darke S, Ward J, Hall W, Heather N, Wodak A (1991). The Opiate Treatment Index (OTI) Researcher’s Manual. National Drug and Alcohol Research Centre Technical Report Number 11. Sydney, National Drug and Alcohol Research Centre.