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      Protocol for a trial assessing the efficacy of a Universal School-Based Prevention Program for addictive behaviors Translated title: Protocolo de un ensayo para evaluar la eficacia de un Programa Escolar de Prevención Universal de conductas adictivas

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          Abstract

          Abstract Background: “Juego de Llaves” [Set of Keys] is a universal school-based prevention program for adolescents aged 12-15. It is aimed at reducing drug use and other addictive behaviors. This paper describes the full protocol for the evaluation design, instruments, randomization procedure, follow-ups, and primary outcomes. Method: Non-Randomized Control Cluster Trial in a set of Spanish secondary schools, with follow-ups at 12-, 24- and 36-months. Participants will be allocated to an experimental or control group. Using a digital application designed for the study, a battery of instruments will be used to assess addictive behaviors, sociodemographic variables, school climate and other transdiagnostic psychological variables. Results: A pilot test will be carried out to test the implementation protocol and to calculate the sample size needed for outcome evaluation. After implementing the program, longitudinal statistical approaches will be used to report intervention efficacy and potential moderators and mediators. Conclusions: There is a lack of assessments on the effectiveness of school prevention programs, and this paper is expected to improve monitoring and ongoing evaluation in prevention.

          Translated abstract

          Resumen Introducción: “Juego de Llaves” es un programa de prevención escolar universal para adolescentes entre 12 y 15 años. Tiene como objetivo reducir el uso de drogas y la implicación en otras conductas adictivas. Se describe un protocolo completo del diseño de evaluación, los instrumentos, el procedimiento de aleatorización, los seguimientos y las variables de resultado. Método: ensayo por conglomerados no aleatorizado en centros escolares españoles de educación secundaria obligatoria con seguimientos a los 12, 24, y 36 meses. Los participantes serán asignados a un grupo experimental o control. A través de una app específicamente diseñada para este estudio, se utilizará una batería de instrumentos de evaluación para conductas adictivas, variables sociodemográficas, clima escolar y otras variables psicológicas transdiagnósticas. Resultados: Se realizará una aplicación piloto para probar el protocolo diseñado y calcular el tamaño muestral necesario para la evaluación de resultados. Posteriormente, se aplicará el programa y se realizarán análisis de datos de tipo longitudinal para informar de la eficacia de la intervención y de los posibles moderadores y mediadores. Conclusiones: Existen pocas evaluaciones de la efectividad de los programas de prevención escolar y se espera que este artículo contribuya, como modelo, a fomentar la cultura de la evaluación.

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          The clinical application of the biopsychosocial model.

          G L Engel (1980)
          How physicians approach patients and the problems they present is much influenced by the conceptual models around which their knowledge is organized. In this paper the implications of the biopsychosocial model for the study and care of a patient with an acute myocardial infarction are presented and contrasted with approaches used by adherents of the more traditional biomedical model. A medical rather than psychiatric patient was selected to emphasize the unity of medicine and to help define the place of psychiatrists in the education of physicians of the future.
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            Sample size used to validate a scale: a review of publications on newly-developed patient reported outcomes measures

            Purpose New patient reported outcome (PRO) measures are regularly developed to assess various aspects of the patients’ perspective on their disease and treatment. For these instruments to be useful in clinical research, they must undergo a proper psychometric validation, including demonstration of cross-sectional and longitudinal measurement properties. This quantitative evaluation requires a study to be conducted on an appropriate sample size. The aim of this research was to list and describe practices in PRO and proxy PRO primary psychometric validation studies, focusing primarily on the practices used to determine sample size. Methods A literature review of articles published in PubMed between January 2009 and September 2011 was conducted. Three selection criteria were applied including a search strategy, an article selection strategy, and data extraction. Agreements between authors were assessed, and practices of validation were described. Results Data were extracted from 114 relevant articles. Within these, sample size determination was low (9.6%, 11/114), and were reported as either an arbitrary minimum sample size (n = 2), a subject to item ratio (n = 4), or the method was not explicitly stated (n = 5). Very few articles (4%, 5/114) compared a posteriori their sample size to a subject to item ratio. Content validity, construct validity, criterion validity and internal consistency were the most frequently measurement properties assessed in the validation studies. Approximately 92% of the articles reported a subject to item ratio greater than or equal to 2, whereas 25% had a ratio greater than or equal to 20. About 90% of articles had a sample size greater than or equal to 100, whereas 7% had a sample size greater than or equal to 1000. Conclusions The sample size determination for psychometric validation studies is rarely ever justified a priori. This emphasizes the lack of clear scientifically sound recommendations on this topic. Existing methods to determine the sample size needed to assess the various measurement properties of interest should be made more easily available. Electronic supplementary material The online version of this article (doi:10.1186/s12955-014-0176-2) contains supplementary material, which is available to authorized users.
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              Heroin addicts have higher discount rates for delayed rewards than non-drug-using controls.

              Fifty-six heroin addicts and 60 age-matched controls were offered choices between monetary rewards ($11-$80) available immediately and larger rewards ($25-$85) available after delays ranging from 1 week to 6 months. Participants had a 1-in-6 chance of winning a reward that they chose on one randomly selected trial. Delay-discounting rates were estimated from the pattern of participants' choices. The discounting model of impulsiveness (Ainslie, 1975) implies that delay-discounting rates are positively correlated with impulsiveness. On average, heroin addicts' discount rates were twice those of controls (p = .004), and discount rates were positively correlated with impulsivity as measured by self-report questionnaires (p < .05). The results lend external validity to the delay-discounting rate as a measure of impulsiveness, a characteristic associated with substance abuse.
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                Author and article information

                Journal
                psicothema
                Psicothema
                Psicothema
                Colegio Oficial de Psicólogos del Principado de Asturias (Oviedo, Asturias, Spain )
                0214-9915
                1886-144X
                2023
                : 35
                : 1
                : 41-49
                Affiliations
                [3] Vienna Vienna orgnameUniversität Wien Austria
                [2] Aragón orgnameUniversidad de Zaragoza Spain
                [1] Asturias orgnameUniversidad de Oviedo Spain
                Article
                S1886-144X2023000100005 S1886-144X(23)03500100005
                10.7334/psicothema2022.251
                df8eff50-22cf-41c8-9ecb-700534395413

                This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

                History
                : 26 May 2022
                : 28 July 2022
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 86, Pages: 9
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                SciELO Spain

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                adolescentes,transdiagnostic approach,universal school-based prevention,evaluation,addictive behaviors,adolescents,aproximación transdiagnóstica,prevención escolar universal,evaluación,conductas adictivas

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