The effect of alcohol strength on alcohol consumption: findings from a randomised controlled cross-over pilot trial

Abstract Background Reducing the alcohol content of drinks has potential to reduce consumption. The aims this study are (1) test feasibility a randomised controlled trial (RCT) assess effect strength on consumption within licensed premises in United Kingdom (UK), and (2) provide data estimate key parameters for RCT. Methods This is double-blind cross-over pilot based four UK. Participants ( n = 36) purchased consumed ad libitum 3.5% lager 4.8% during two separate sessions. Descriptive statistics reported efficacy efficiency processes, rates recruitment, participant recruitment attrition. Mean 95% confidence interval (CI) compared between conditions. mean, standard deviation (SD) CI UK units were used calculate sample size Responses questionnaires duration participation sessions conditions analysed. Results Components protocol effective efficient. venue rate was less than anticipated. greater attrition 23% varied by 1% according arm trial. There reduction under intervention Estimated mean difference, (UK units): − 3.76 (− 5.01 2.52). required RCT 53. did not find one more pleasant taste: (on scale 10) 0.95 2.11 0.21). found reduced-strength enjoyable: 1.44 2.64 0.24) they perceived themselves be intoxicated after consuming it: 1.00 1.61 0.40). Conclusion A feasible with minor alterations scoping work establish different brands that alike enjoyable products Trial registration Registered American Economic Association (AEA) Randomised Controlled Registry as 16 June 2017. Unique identifying number: AEARCTR-0002266 .