Whether it involves the delivery of the full Preventure Programme or personality-specific interventions, the personality-targeted approach has now been evaluated in eight randomised trials, with two additional trials in progress. Published trials are summarised in Table 1 and include standardised effect size estimates for primary outcomes: alcohol use, binge drinking, problem drinking and illicit or prescription drug use. Where possible, results of quantity and frequency outcomes are also included. While this does not include a systematic review and formal meta-analysis, the trials summarised in this table include all published trials of personality-targeted interventions to date. These trials typically target individuals who are considered at high risk of misusing substances prior to the onset, use or problem use of substances. Therefore, many of the trials are conducted with secondary school students who have been invited to participate in interventions because they scored one standard deviation above the mean on one of the SURPS measures. Some such trials also specified drinking onset as an additional eligibility criterion (e.g. [60, 77]). Two trials differ in that they target adults recruited from the community
