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Perceived support and conflict between adolescents and young adults with cancer and their primary caregivers, other family, close friends, and medical staff were examined in relation to adolescents and young adults' psychological health. Adolescents and young adults ( n = 115, 51% male, ages 12-24 years, M (standard deviation)  = 16.07 (2.29)) in outpatient cancer treatment perceived more support and conflict within familial relationships than other relationships. Among familial relationships, perceived support and conflict were associated with psychological health; within other relationships, only support was associated with psychological health. Interactions among family were most strongly correlated with psychological distress; interactions with friends were stronger correlates of posttraumatic stress symptoms, positive affect, and posttraumatic growth.

Policy-makers are increasingly turning to behavioural science for insights about how to improve citizens' decisions and outcomes.sup.1. Typically, different scientists test different intervention ideas in different samples using different outcomes over different time intervals.sup.2. The lack of comparability of such individual investigations limits their potential to inform policy. Here, to address this limitation and accelerate the pace of discovery, we introduce the megastudy--a massive field experiment in which the effects of many different interventions are compared in the same population on the same objectively measured outcome for the same duration. In a megastudy targeting physical exercise among 61,293 members of an American fitness chain, 30 scientists from 15 different US universities worked in small independent teams to design a total of 54 different four-week digital programmes (or interventions) encouraging exercise. We show that 45% of these interventions significantly increased weekly gym visits by 9% to 27%; the top-performing intervention offered microrewards for returning to the gym after a missed workout. Only 8% of interventions induced behaviour change that was significant and measurable after the four-week intervention. Conditioning on the 45% of interventions that increased exercise during the intervention, we detected carry-over effects that were proportionally similar to those measured in previous research.sup.3-6. Forecasts by impartial judges failed to predict which interventions would be most effective, underscoring the value of testing many ideas at once and, therefore, the potential for megastudies to improve the evidentiary value of behavioural science. A massive field study whereby many different treatments are tested synchronously in one large sample using a common objectively measured outcome, termed a megastudy, was performed to examine the ability of interventions to increase gym attendance by American adults., Author(s): Katherine L. Milkman [sup.1] , Dena Gromet [sup.2] , Hung Ho [sup.1] [sup.26] , Joseph S. Kay [sup.2] , Timothy W. Lee [sup.2] [sup.27] , Pepi Pandiloski [sup.3] , [...]

Community-based participatory research is predicated on building partnerships that tackle important issues to the community and effectively improve these issues. Community-based participatory research can also be an empowering experience, especially for children. This article describes a university-community partnership in which students at a low-income middle school worked to improve the quality of the cafeteria food provided to the 986 students eligible for free and reduced price lunches. The project led to menu changes, improved communication between youth, school administrators, and district staff, and enabled youth to enact school improvements that were beneficial for their health.