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Augmenting Outpatient Alcohol Treatment as Usual With Online Alcohol Avoidance Training: Protocol for a Double-Blind Randomized Controlled Trial

Augmenting Outpatient Alcohol Treatment as Usual With Online Alcohol Avoidance Training: Protocol for a Double-Blind Randomized Controlled Trial

An a priori statistical power analysis (G-power) was conducted to determine the necessary number of participants. The primary outcome measure is a reduction in alcohol consumption. To obtain an estimate of the effect size to be expected, studies describing previous Alcohol Avoidance Training interventions were inspected [21,23]. In both these studies, a relative increase of 20% was observed in effectiveness of TAU + CBM as compared to TAU.

Marleen KJ Corine Bratti-van der Werf, Melissa C Laurens, Marloes G Postel, Marcel E Pieterse, Somaya Ben Allouch, Reinout W Wiers, Ernst T Bohlmeijer, Elske Salemink

JMIR Res Protoc 2018;7(3):e55

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Web-Based Cognitive Behavioral Therapy for Female Patients With Eating Disorders: Randomized Controlled Trial

Web-Based Cognitive Behavioral Therapy for Female Patients With Eating Disorders: Randomized Controlled Trial

Power analysis (G*Power) revealed a sample size of 25 participants in each condition based on a significance level of 5%, a power of 80%, the same number of participants per condition, 2 measurements, and a correlation among repeated measures of 0.95. However, we expected 40% of the participants not to complete the Web-based CBT, therefore, 42 participants in each condition (Web-based CBT and WL) were needed.

Elke D Ter ter Huurne, Hein A de Haan, Marloes G Postel, Job van der Palen, Joanne EL VanDerNagel, Cornelis AJ DeJong

J Med Internet Res 2015;17(6):e152

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Attrition in Web-Based Treatment for Problem Drinkers

Attrition in Web-Based Treatment for Problem Drinkers

Chiauzzi et al [6] found baseline stage of readiness for change (contemplation) to be a predictor of dropout attrition, and Postel et al [16] found that intervention completers had a higher baseline score on treatment readiness. It could be suggested that the results concerning the differences between completers and noncompleters are frequently ambiguous and are often found in only a single study. This might be the result of the differences in target groups and intervention characteristics.

Marloes G Postel, Hein A de Haan, Elke D ter Huurne, Job van der Palen, Eni S Becker, Cor AJ de Jong

J Med Internet Res 2011;13(4):e117

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Article has an altmetric score of 4