Time trend analysis by gender and substance used was calculated using a segmented regression model. This is a retrospective study based on the registry of 18,367 hospitalizations and 7,124 patients with a mental health disorder admitted during the period 1998 to 2020 in Malaga, Spain. The aim of this study was to analyze the temporal trends in the prevalence of substance use disorders in patients admitted to a psychiatric inpatient unit between 19. Co-occurring substance use disorders have been associated with a worse prognosis and poorer adherence to treatment. Substance use disorders are highly prevalent in people living with a mental health disorder. Marked increases in resin potency and value from 2011‐2016 are consistent with the emergence of new resin production techniques in European and neighbouring drug markets. Cannabis resin (but not herbal cannabis) increased in the quantity of Δ⁹‐tetrahydrocannabinol per Euro spent. All price trends persisted after adjusting for inflation.Įuropean cannabis resin and herbal cannabis increased in potency and price from 2006‐2016. Quadratic time trends for resin potency and value indicated minimal change from 2006‐2011, followed by marked increases from 2011‐2016. Mixed effects linear regression models were used to estimate linear and quadratic time trends, with a random intercept and slope fitted to account for variation across countries. Inflation was estimated using the Harmonised Indices of Consumer Prices. Outcome variables were potency, price, and value for cannabis resin and herbal cannabis in Europe, 2006‐2016. To quantify changes in (i) potency (concentration of Δ⁹‐tetrahydrocannabinol %THC), (ii) price (Euros/gram of cannabis), and (iii) value (quantity of THC per price unit mg THC/Euro) of cannabis resin and herbal cannabis in Europe.ĭata collected from 28 EU member states, Norway and Turkey by the European Monitoring Centre for Drugs and Drug Addiction.