Based on the 22 countries with available data in the years 2010 and 2019 (representing 76% of the population aged 15 to 64 among all 28 studied countries in the year 2019), the rate of treatment entries for cannabis as primary problem per 100,000 adults increased from 27·0 (95% CI: 17·2 to 36·8) to 35·1 (95% CI: 23·6 to 46·7). The changes in treatment rates are also displayed in Figure 4. Regression models suggest a significantly declining treatment rate only for the Netherlands (annualized decrease in treatment entries per 100,000 adults: -2·4, p=·005), Finland (-0·4, p=·002), and Slovenia (-·3, p=·01). In ten countries, treatment rates significantly increased. Modest increases were recorded in Greece, Poland, Austria, Slovakia, and Portugal (annualized increase in treatment entries per 100,000 adults between +0·8 and 1·9, all p<·001), while more pronounced increases were present in Romania, Belgium, France, Malta, and Sweden (annualized increase in treatment entries per 100,000 adults between +4·3 and 6·4, all p<·01).
