The purpose of this study was to test (a) whether drinking motives predict event-level drinking on weekend evenings; (b) whether the number of friends present in social situations was associated with drinking on weekend evenings; and (c) whether drinking motives moderate the association between friends present and drinking.We linked individual-level drinking motives (measured at baseline) […] read more
Smit, K., Groefsema, M., Luijten, M., Engels, R., & Kuntsche, E. (2015). Drinking Motives Moderate the Effect of the Social Environment on Alcohol Use: An Event-Level Study Among Young Adults. Journal of studies on alcohol and drugs, 76(6), 971-980.
Voogt, C. V., Kuntsche, E., Kleinjan, M., Poelen, E. A. P., & Engels, R. C. M. E. (2014). De korte online alcoholinterventie ‘Wat Drink Jij’ verhoogt de zelfeffectiviteit van jonvolwassenen in sociale situaties en voorkomt een toename in alcoholgebruik over tijd. Tijdschrift voor Psychiatrie, 56(10): 690-690.
Voogt, C. V., Larsen, H., Poelen, E. A. P., Kleinjan, M., & Engels, R. C. M. E. (2013). Longitudinal associations between descriptive and injunctive norms of youngsters and heavy drinking and problem drinking in late adolescence. Journal of Substance Use, 18(4), 275-287.
Cross-sectionally, social norms are related to heavy and problem drinking in late adolescence. A better understanding is needed regarding the longitudinal associations between social norms in younger populations and heavy and problem drinking over time. This study distinguished between descriptive (proximal reference group) and injunctive norms (proximal and distal reference groups). This study evaluated the perception of social norms […] read more
Voogt, C. V., Poelen, E. A. P., Kleinjan, M., Lemmers, L. A. C. J., & Engels, R. C. M. E. (2013). The effectiveness of the What Do You Drink web-based brief alcohol intervention in reducing heavy drinking among students: A two-arm parallel group randomized controlled trial. Alcohol and Alcoholism, 48(3), 312-321.
The aim was to evaluate the effectiveness of a web-based brief alcohol intervention ‘What Do You Drink’ (WDYD) among heavy drinking students at 1- and 6-month post-intervention. Additionally, it was investigated whether certain subgroups would benefit more than others from the WDYD intervention. A two-arm parallel group randomized controlled trial was conducted online in the […] read more
Voogt, C. V., Poelen, E. A. P., Kleinjan, M., Lemmers, L. A. C. J., & Engels, R. C. M. E. (2013). The development of a web-based brief alcohol intervention in reducing heavy drinking among college students: An Intervention Mapping approach. Health Promotion International, dat016.
In the Netherlands, young adults’ drinking practices have become an issue of public concern since their drinking levels are high. Heavy drinking can place young adults at an increased risk for developing short and long-term health-related problems. Current national alcohol prevention programmes focus mainly on adolescents and their parents and paying less systematic attention to […] read more
Voogt, C. V., Kuntsche, E., Kleinjan, M., Poelen, E. A. P., & Engels, R. C. M. E. (2014). Using ecological momentary assessment to test the effectiveness of a web-based brief alcohol intervention over time among heavy-drinking students: Randomized controlled trial. Journal of Medical Internet Research, 16(1): e5.
Web-based brief alcohol interventions are effective in reducing alcohol use among students when measured at limited follow-up time points. To date, no studies have tested Web-based brief alcohol intervention effectiveness over time by using a large number of measurements. The aim was to test whether the What Do You Drink (WDYD) Web-based brief alcohol intervention […] read more
Voogt, C. V., Kuntsche, E., Kleinjan, M., Poelen, E. A. P., Lemmers, L. A. C. J., & Engels, R. C. M. E. (2013). Using ecological momentary assessment in testing the effectiveness of an alcohol intervention: A two-arm parallel group randomized controlled trial. PLoS One, 8(11): e78436.
Alcohol consumption of college students has a fluctuating nature, which might impact the measurement of intervention effects. By using 25 follow-up time-points, this study tested whether intervention effects are robust or might vary over time. Data were used from a two-arm parallel group randomized controlled trial applying ecological momentary assessment (EMA) with 30 data time-points […] read more
Voogt, C. V., Kuntsche, E., Kleinjan, M., Poelen, E. A. P., & Engels, R. C. M. E. (2014). The effect of the ‘What Do You Drink’ web-based brief alcohol intervention on self-efficacy to better understand changes in alcohol use over time: Randomized controlled trial using ecological momentary assessment. Drug and Alcohol Dependence, 138, 89-97.
The aim of the study was to examine whether (1) the ‘What Do You Drink’ (WDYD) intervention resulted in drinking refusal self-efficacy (DRSE) changes directly after the intervention, and if so, whether these changes sustained at six-months follow-up and (2) DRSE was related to alcohol use over time, and if so, whether the strength of […] read more
Voogt, C. V., Kleinjan, M., Poelen, E. A., Lemmers, L. A., & Engels, R. C. (2013). The effectiveness of a web-based brief alcohol intervention in reducing heavy drinking among adolescents aged 15-20 years with a low educational background: A two-arm parallel group cluster randomized controlled trial. BMC Public Health, 13(1), 694.
The prevalence of heavy drinking among college students and its associated health related consequences highlights an urgent need for alcohol prevention programs targeting 18 to 24 year olds. Nevertheless, current alcohol prevention programs in the Netherlands pay surprisingly little attention to the drinking patterns of this specific age group. The study described in this protocol […] read more
Jager, G., Block, R.I., Luijten, M., Ramsey, N.F. (2010) Cannabis Use and Memory Brain Function in Adolescent Boys: A Cross-Sectional Multicenter Functional Magnetic Resonance Imaging Study, Journal of the American Academy of Child and Adolescent Psychiatry, 49(6), 561-567.
Objective: Early-onset cannabis use has been associated with later use/abuse, mental health problems (psychosis, depression), and abnormal development of cognition and brain function. During adolescence, ongoing neurodevelopmental maturation and experience shape the neural circuitry underlying complex cognitive functions such as memory and executive control. Prefrontal and temporal regions are critically involved in these functions. Maturational processes leave these brain areas […] read more