Update to the effectiveness and cost-effectiveness of a mindfulness training programme in schools compared with normal school provision (MYRIAD): study protocol for a randomised controlled trial

Abstract: Background: MYRIAD (My Resilience in Adolescence) is a superiority, parallel group, cluster randomised controlled trial designed to examine the effectiveness and cost-effectiveness of a mindfulness training (MT) programme, compared with normal social and emotional learning (SEL) school provision to enhance mental health, social-emotional-behavioural functioning and well-being in adolescence. The original trial protocol was published in Trials (accessible at https://doi.org/10.1186/s13063-017-1917-4). This included recruitment in two cohorts, enabling the learning from the smaller first cohort to be incorporated in the second cohort. Here we describe final amendments to the study protocol and discuss their underlying rationale. Methods: Four major changes were introduced into the study protocol: (1) there were changes in eligibility criteria, including a clearer operational definition to assess the degree of SEL implementation in schools, and also new criteria to avoid experimental contamination; (2) the number of schools and pupils that had to be recruited was increased based on what we learned in the first cohort; (3) some changes were made to the secondary outcome measures to improve their validity and ability to measure constructs of interest and to reduce the burden on school staff; and (4) the current Coronavirus Disease 2019 (SARS-CoV-2 or COVID-19) pandemic both influences and makes it difficult to interpret the 2-year follow-up primary endpoint results, so we changed our primary endpoint to 1-year follow-up. Discussion: These changes to the study protocol were approved by the Trial Management Group, Trial Steering Committee and Data and Ethics Monitoring Committees and improved the enrolment of participants and quality of measures. Furthermore, the change in the primary endpoint will give a more reliable answer to our primary question because it was collected prior to the COVID-19 pandemic in both cohort 1 and cohort 2. Nevertheless, the longer 2-year follow-up data will still be acquired, although this time-point will be now framed as a second major investigation to answer some new important questions presented by the combination of the pandemic and our study design. Trial registration: International Standard Randomised Controlled Trials ISRCTN86619085. Registered on 3 June 2016

Prosocial influence and opportunistic conformity in adolescents and young adults

Stimuli, data, scripts and supplementary materia

The matrix reasoning item bank (MaRs-IB):Novel, open-access abstract reasoning items for adolescents and adults

Existing non-verbal ability tests are typically protected by copyright, preventing them from being freely adapted or computerized. Working towards an open science framework, we provide 80 novel, open-access abstract reasoning items, an online implementation and item-level data from 659 participants aged between 11 and 33 years: the matrix reasoning item bank (MaRs-IB). Each MaRs-IB item consists of an incomplete matrix containing abstract shapes. Participants complete the matrices by identifying relationships between the shapes. Our data demonstrate age differences in non-verbal reasoning accuracy, which increased during adolescence and stabilized in early adulthood. There was a slight linear increase in response times with age, resulting in a peak in efficiency (i.e. a measure combining speed and accuracy) in late adolescence. Overall, the data suggest that the MaRs-IB is sensitive to developmental differences in reasoning accuracy. Further psychometric validation is recommended

The relationship between perceived income inequality, adverse mental health and interpersonal difficulties in UK adolescents

Adolescence is a period of life when young people increasingly define themselves through peer comparison and are vulnerable to developing mental health problems. In the current study, we investigated whether the subjective experience of economic disadvantage is associated with social difficulties and poorer mental health in early adolescence. We used latent change score modelling (LCSM) on data from the UK Millennium Cohort Study, collected at ages 11 and 14 (N=12995). Each LCSM estimated 5 parameters of 10 mental health and interpersonal difficulties-related variables: the mean of the outcome at age 11, and its variance; the change of the outcome from age 11 to age 14, and its variance; and a self-regressive parameter of the mean at age 11 on the change from age 11 to age 14. Perceived income inequality (e.g., perceiving oneself as belonging to a poorer family than the families of one’s peers) predicted adverse mental health and a range of interpersonal difficulties during adolescence, even when controlling for objective family income. Follow-up analyses highlighted that, at 11 years, young people who perceived themselves as belonging to poorer families than their friends reported worse well-being, self-esteem, internalising problems, externalising problems and victimisation at the same age (relative to those who perceived themselves as richer than or equal to their friends, or who did not know). Longitudinal analyses suggested that victimisation decreased from age 11 to 14 to a greater extent for adolescents who perceived themselves as poorer than other adolescents. Negative social comparisons in early adolescence could further amplify the negative effects of economic disadvantage on mental health and behavioural difficulties during this period

The relationship between perceived income inequality, adverse mental health and interpersonal difficulties in UK adolescents

BACKGROUND: Adolescence is a period of life when young people increasingly define themselves through peer comparison and are vulnerable to developing mental health problems. In the current study, we investigated whether the subjective experience of economic disadvantage among friends is associated with social difficulties and poorer mental health in early adolescence. METHODS: We used latent change score modelling (LCSM) on data from the UK Millennium Cohort Study, collected at ages 11 and 14 (N = 12,995). Each LCSM modelled the mean of an outcome related to mental health and interpersonal difficulties at age 11 (including self-esteem, well-being, emotional difficulties, peer problems, bullying, victimisation and externalising difficulties), the change of the outcome from ages 11 to 14 and its predictors, including perceived income inequality among friends (i.e. perceiving oneself as belonging to a poorer family than the families of one's friends). RESULTS: Perceived income inequality predicted adverse mental health and a range of interpersonal difficulties during adolescence, even when controlling for objective family income. Follow-up analyses highlighted that, at 11 years, young people who perceived themselves as belonging to poorer families than their friends reported worse well-being, self-esteem, internalising problems, externalising problems and victimisation at the same age (relative to those who perceived themselves as richer than or equal to their friends, or who did not know). Longitudinal analyses suggested that victimisation decreased from ages 11 to 14 to a greater extent for adolescents who perceived themselves as poorer than other adolescents. CONCLUSIONS: The salience of economic inequalities in proximal social environments (e.g. among friends) in early adolescence could further amplify the negative effects of economic disadvantage on mental health and behavioural difficulties during this period