Asociación Ala Milano Onlus -Primaepoi.it projectObjective. The present study is an evaluation of a designated driver intervention. The objectives were: (1) to verify the intervention assumption, which is that offering incentives, linked to a positive result of the breathalyser test (<0.5 g/l) when leaving the club, leads to a decrease in the percentage of drivers leaving the club with a BAC above the legal limit; (2) to understand the reason why drivers take part in the intervention and assess whether the operation was effective in lowering the amount of alcohol consumed during the night; (3) to verify the assumption that there is a bias in the selection of designated drivers. Method: Pre-experimental research design with a control group and no Method: Pre-experimental research design with a control group and no Method: pre-test. The two conditions of the independent variable were: presence or absence of the "Safe Driver" intervention. A group of drivers who took part in the intervention (DDs N=124) was compared with a group that did not (non-DDs N=139). Results. (1) DDs' mean BAC was significantly lower than non-DDs', but (2) the incentive motivated just 5% of DDs to drink less, and (3) there is a bias in the selection of DDs that present a lower drinking risk profile than non-DDs. Discussion. The effectiveness of the intervention doesn't seem to be supported by strong evidence. The free-entrance incentive is not effective in motivating drivers to drink less. More research is needed to evaluate the effectiveness of designated driver interventions where the bias in the selection of drivers has been removed, by, for example, using other incentives and to have a clear understanding of designated drivers' risk profile.
Key words: alcohol, blood alcohol concentration (BAC), designated driver, driving under the influence (DUI), evaluation.
RESUMEN ABSTRACTObjetivo. El presente estudio es una evaluación de una intervención con conductores designados (CD). Los objetivos eran: (1) verificar la base de la intervención, que es dar incentivos vinculados a un resultado positivo en la prueba de alcoholemia (<0.5 g/l) al salir de la discoteca, lo cual redunda en un descenso en el porcentaje de conductores que salían de la discoteca con una CAS superior al límite; (2) comprender las razones de los conductores para participar en la intervención y valorar si la operación fue efectiva para rebajar la cantidad de alcohol consumido durante la noche; (3) comprobar si hay parcialidad en la selección de conductores designados. Método. Diseño de investigación pre-experimental con un grupo de control y sin pre-test. Las dos condiciones de la variable independiente fueron: presencia o ausencia de la intervención del «Conductor Seguro». Se comparó a un grupo de conductores que participaron en la intervención (CD N=124) con un grupo que no participó (no-CD N=139). Resultados.(1) La CAS media de los CD fue significativamente más baja que la de los no-CD, pero (2) el incentivo hizo que el 5% de los CD bebiesen menos, y (3) hay parcialidad e...