Background: The objective of this research was to evaluate data from a randomized clinical trial that tested injectable
diacetylmorphine (DAM) and oral methadone (MMT) for substitution treatment, using a multi-domain dichotomous index, with
a Bayesian approach.
Methods: Sixty two long-term, socially-excluded heroin injectors, not benefiting from available treatments were randomized
to receive either DAM or MMT for 9 months in Granada, Spain. Completers were 44 and data at the end of the study period
was obtained for 50. Participants were determined to be responders or non responders using a multi-domain outcome index
accounting for their physical and mental health and psychosocial integration, used in a previous trial. Data was analyzed with
Bayesian methods, using information from a similar study conducted in The Netherlands to select a priori distributions. On
adding the data from the present study to update the a priori information, the distribution of the difference in response rates
were obtained and used to build credibility intervals and relevant probability computations.

Read more: heroin_vs_methadone_2_2009