Constraining the tectonic evolution of rifted continental margins by U-Pb calcite dating.

We employ U-Pb calcite dating of structurally-controlled fracture fills within crystalline Caledonian basement in western Norway to reveal subtle large-scale tectonic events that affected this rifted continental margin. The ages (15 in total) fall into four distinct groups with ages mainly ranging from latest Cretaceous to Pleistocene. (1) The three oldest (Triassic-Jurassic) ages refine the complex faulting history of a reactivated fault strand originated from the Caledonian collapse and broadly correlate with known rifting events offshore. (2) Two ages of ca. 90-80 Ma relate to lithospheric stretching and normal fault reactivation of a major ENE-WSW trending late Caledonian shear zone. (3) We correlate five ages between ca. 70 and 60 Ma with far-field effects and dynamic uplift related to the proto-Iceland mantle plume, the effect and extent of which is highly debated. (4) The five youngest ages (< 50 Ma) from distinct NE-SW trending faults are interpreted to represent several episodes of post-breakup fracture dilation, indicating a long-lived Cenozoic deformation history. Our new U-Pb data combined with structural and isotopic data show that much larger tracts of the uplifted continental margin of western Norway have been affected by far-field tectonic stresses than previously anticipated, with deformation continuing into the late Cenozoic.

A continent-wide detailed geological map dataset of Antarctica.

A dataset to describe exposed bedrock and surficial geology of Antarctica has been constructed by the GeoMAP Action Group of the Scientific Committee on Antarctic Research (SCAR) and GNS Science. Our group captured existing geological map data into a geographic information system (GIS), refined its spatial reliability, harmonised classification, and improved representation of glacial sequences and geomorphology, thereby creating a comprehensive and coherent representation of Antarctic geology. A total of 99,080 polygons were unified for depicting geology at 1:250,000 scale, but locally there are some areas with higher spatial resolution. Geological unit definition is based on a mixed chronostratigraphic- and lithostratigraphic-based classification. Description of rock and moraine polygons employs the international Geoscience Markup Language (GeoSciML) data protocols to provide attribute-rich and queryable information, including bibliographic links to 589 source maps and scientific literature. GeoMAP is the first detailed geological map dataset covering all of Antarctica. It depicts 'known geology' of rock exposures rather than 'interpreted' sub-ice features and is suitable for continent-wide perspectives and cross-discipline interrogation.

Needs ranking: A qualitative study using a participatory approach.

Youth disengagement is a growing concern globally, yet little research has been done to explore participatory approaches that can engage youth as co-creators of community programs that improve their resilience. The primary objective of the study is to report on the results of an innovative participatory approach used in the Eastern and Western Cape provinces, South Africa, to engage vulnerable youth in needs ranking. Data for this paper were collected in three phases. Using information gleaned from the literature review (Phase I), authors compiled a list of core needs on separate cards. In Phase II, youth discussed and ranked each need in terms of importance for their community. In Phase III, youth participated in focus group discussions on the ranked needs as part of a broader discussion on youth risk behaviours. Thematic analysis was used for qualitative data. Needs ranking data were analysed using descriptive statistics. Although expressed priority needs differed amongst communities, combined data revealed the top expressed priorities as further education (priority 1; 85%), skills development (priority 2; 74%) and career development and training (priority 3; 68%). Differences between critical needs as discussed in the literature and those perceived by youth were noted. Focus group data validated the expressed priority needs and highlighted that vulnerable youth felt valued through the needs ranking activity. Involving youth in the assessment of their needs can improve the value of information obtained, which in turn can facilitate better allocation of community resources.

Adolescent Substance Use Behavior Change Through School Intervention Is Improved by Teacher and School Implementation Support Together, Especially for Girls.

An earlier trial of a school-based, preventative intervention, HealthWise South Africa, demonstrated some efficacy in preventing adolescent drinking and smoking in the Western Cape, South Africa. This was followed by the current implementation trial, which examined how implementation support conditions influenced adolescent drinking and smoking behavior change in the HealthWise intervention. The hybridized implementation-effectiveness trial included 34 schools (n = 2175 students) that provided student data at four waves through Grades 8 to 10. Implementation support conditions included a combination of two components (enhanced school environment and teacher consultation), resulting in four conditions: enhanced school environment, teacher consultation, both components, and standard delivery. Using configural frequency analysis, we examined how drinking and smoking behavior change differed across four configurations of intervention support longitudinally and by gender. For baseline non-smokers, results indicated sustained differences in abstention from smoking and smoking initiation between schools that received both support components and schools in the standard delivery condition. These results were primarily driven by girls. For baseline drinkers and smokers in the both components condition, changes in drinking were delayed until Grade 9 and smoking decayed by Grade 10. Results suggest that providing both school and teacher implementation support synergistically facilitates improved intervention outcomes both immediately following intervention and 2 years later across schools with diverse resource levels. Future iterations of HealthWise, and other interventions, may benefit from a multilevel implementation support strategy to improve student outcomes. More research is needed to understand how to improve HealthWise effectiveness among boys.

Rural voices: A social-ecological perspective on factors influencing youth substance use in rural South africa.

BACKGROUND: Youth can be a positive force for development when provided with the knowledge and opportunities they need to thrive, yet they continue to experience insurmountable challenges, such as poverty and absentee fathers, that prompt them to resort to risk behaviours such as substance use. In rural South Africa, women tend to be the breadwinners and more involved with parenting than men. OBJECTIVE: The primary objective of the study was to explore perspectives of rural youth on factors influencing youth participation in substance use. The secondary objective was to obtain the perspectives of adult women on factors influencing substance use among young people. METHODS: The qualitative study, informed by a social-ecological framework, utilised a semi-structured interview protocol in focus group discussions in rural South Africa. Seven focus group discussions, each with between 8 and 15 individuals were conducted with 79 youth. The eighth discussion was with nine adult women. Data were audio recorded and transcribed verbatim, manually coded and further analysed into themes using NVivo 12. FINDINGS: Four themes emerged: hopelessness and lack of motivation, lack of adult role models such as father, lack of built environment for recreational activities and lack of educational opportunities. The social-ecological model provided a useful framework to understand the findings. In line with this model, rural youth in South Africa described a variety of factors that influenced youth substance use and other risk behaviours. These related to the individual, relationships with others, community and societal norms and values factors of the social-ecological model. CONCLUSIONS: The broadening spectrum of substances available to an increasing youth population bulge in Africa suggests a strong threat of social and disease burden due to substance use disorders. Given this threat, this study provides awareness to a multi-systems approach needed to support the rural South African youth.

Supporting South African High School Teachers' Implementation of a Prevention Program via Abridged Consultation: Outcomes and Moderators.

Research is lacking on consultation support for school-based evidence-based programs (EBP) intended to prevent youths' risky behaviors in schools in low-resourced settings like high schools surrounding Cape Town, South Africa. Thus, this study's objective was to examine implementation outcomes and moderators of an abridged consultation condition for supporting teachers in better implementing HealthWise, an EBP for preventing youth risky sexual and substance use behaviors. Twenty-one schools with 33 teachers receiving abridged consultation (i.e., three consultation meetings, text message reminders, lesson plans, and support kits) were compared to 26 schools with 41 teachers that did not receive any consultation. Teachers with abridged consultation self-reported delivering more HealthWise content. Moderation analyses found teachers with lower educational degrees, who received abridged consultation reported more student interest in HealthWise. When there was higher school-level risk, teachers who received abridged consultation marginally self-reported adapting HealthWise more. Findings suggest consultation support that is abridged or a lower dose than is typical can be feasible in such a low-resourced, overburdened setting while still being associated with EBP coverage, student interest, and adaptation. However, moderation findings suggest contextual factors should be considered to match teachers/schools to the implementation support that best suits them.

Profiles of Adolescent Leisure Motivation and Substance Use in the HealthWise South Africa Research Trial: A Person-Centered Approach.

Engaging in intrinsically motivated behaviors, both within and outside of the leisure context, is associated with well-being. However, individuals can be driven by multiple types of motivation simultaneously, and the impact of constellations of leisure motivation is relatively unknown. The current study uses South African adolescents in the HealthWise South Africa efficacy trial (N=2,204; M age =14.0) to identify profiles of leisure motivation, examine the association between profiles and substance use, and evaluate the impact of HealthWise on changes in motivation profiles over time. Results indicate three distinct profiles: high consistent motivation, low consistent motivation, and high intrinsic motivation. Members of the high intrinsic profile had the lowest odds of substance use. Profiles were fairly stable across all time points except for females in a high-training intervention school. Results illustrate the importance of identifying and understanding typologies of leisure motivation and health across time, which can be used to promote positive development in adolescents.

A weighted bootstrap approach to logistic regression modelling in identifying risk behaviours associated with sexual activity.

The latest population estimates released by Statistics South Africa indicate that 25.03% of all deaths in 2017 in South Africa were AIDS-related. Along with these results, it is also reported that 7.06% of the population were living with HIV, with the HIV-prevalence among youth (aged 15-24) at 4.64% for 2017 (STATSSA. (2018). Retrieved from Statistics South Africa: http://www.statssa.gov.za/publications/P0302/P03022017.pdf ). The data used in the study contained information related to the risk-taking behaviours associated with the sexual activity of entering first-year students at the University of the Western Cape. In this study, a logistic regression modelling procedure was carried out on those students that were determined to be sexually active, therefore, in the modelling procedure significant risk behaviours of sexually active first-year students could be identified. Of the 14 variables included in the modelling procedure, six were found to be significantly associated with sexually active students. The significant variables included; the age and race of the student, whether the student had ever taken an HIV test, the importance of religion in influencing the sexual behaviour of the student, whether the student consumed alcohol and lastly whether the student smoked. This study further investigated the impact of introducing sample weighting, bootstrap sampling as well as variable selection methods into the logistic regression modelling procedure. It is shown that incorporating these techniques into the modelling procedure produces logistic regression models that are more accurate and have an increased predictive capability. The bootstrapping procedure is shown to produce logistic regression models that are more accurate than those produced without a bootstrap procedure. A comparison between 200, 500 and 1000 bootstrap samples is also incorporated into the modelling procedure with the models produced from 200 bootstrap samples shown to be just as accurate those produced from 500 or 1000 bootstrap samples. Of the five variable selection methods used, it is shown that the Newton-Raphson and Fisher methods are unreliable in producing logistic regression models. The forward, backward and stepwise variable selection methods are shown to produce very similar results.

A weighted bootstrap approach to logistic regression modelling in identifying risk behaviours associated with sexual activity

The latest population estimates released by Statistics South Africa indicate that 25.03% of all deaths in 2017 in South Africa were AIDS-related. Along with these results, it is also reported that 7.06% of the population were living with HIV, with the HIV-prevalence among youth (aged 15­24) at 4.64% for 2017 (STATSSA. (2018). Retrieved from Statistics South Africa: http://www.statssa.gov.za/publications/P0302/P03022017.pdf). The data used in the study contained information related to the risk-taking behaviours associated with the sexual activity of entering first-year students at the University of the Western Cape. In this study, a logistic regression modelling procedure was carried out on those students that were determined to be sexually active, therefore, in the modelling procedure significant risk behaviours of sexually active first-year students could be identified. Of the 14 variables included in the modelling procedure, six were found to be significantly associated with sexually active students. The significant variables included; the age and race of the student, whether the student had ever taken an HIV test, the importance of religion in influencing the sexual behaviour of the student, whether the student consumed alcohol and lastly whether the student smoked. This study further investigated the impact of introducing sample weighting, bootstrap sampling as well as variable selection methods into the logistic regression modelling procedure. It is shown that incorporating these techniques into the modelling procedure produces logistic regression models that are more accurate and have an increased predictive capability. The bootstrapping procedure is shown to produce logistic regression models that are more accurate than those produced without a bootstrap procedure. A comparison between 200, 500 and 1000 bootstrap samples is also incorporated into the modelling procedure with the models produced from 200 bootstrap samples shown to be just as accurate those produced from 500 or 1000 bootstrap samples. Of the five variable selection methods used, it is shown that the Newton­Raphson and Fisher methods are unreliable in producing logistic regression models. The forward, backward and stepwise variable selection methods are shown to produce very similar results

Trends in HIV risk behaviour of incoming first-year students at a South African university: 2007-2012.

The aim of the research on which this article is based was to understand the behavioural changes of the target student population over time to ensure that future prevention programmes are more effective in changing behaviour. This study reports on quantitative data collected at the University of the Western Cape over a six-year period between 2007 and 2012. All the students attending the orientation sessions and who were willing to complete the anonymous questionnaire during each of the six years were included in the study. Data were collected on the following aspects and subjects: sexual activity, age at first sexual encounter, number of sexual partners, condom usage, knowledge of how to use a condom, perceived ability to discuss condoms usage with a sexual partner, perception of HIV risk and HIV testing as well as the intention to be tested. Reported alcohol and drug usage, as well as depressive symptoms, was also recorded. The percentage of students reporting having had vaginal sex prior to entering university increased from 44% in 2007 to 51% in 2012 but, alarmingly, the consistent use of condoms decreased from 60% in 2007 to 51% in 2012. The average onset age of about 15.6 years for males and 16.7 years for females for vaginal sex did not change over the six-year period. No difference in smoking patterns or drug use was seen over the period of the study, but the number of entering students who indicated that they consumed alcohol increased significantly from 48% in 2007 to 58% in 2012. HIV testing increased from 19% in 2007 to 47% in 2012, whereas the intention to be tested showed no significant change over the period. Although students increasingly reported that they knew enough about HIV/AIDS (63% in 2007 and 69% in 2012), about a third reported suffering from AIDS fatigue. Prevention efforts targeted at those incoming first-year students who are not yet sexually active (about 45% in this study) should be developed and should take into account the multiplicity of factors that appear to influence their sexual debut.

Correlates of sexual activity versus non-activity of incoming first-year students at a South African university.

In order to contribute to the design of more effective programmes to curb the spread of HIV at tertiary institutions, this study compares the profile of students who are sexually active versus those who are not yet sexually active when entering university. The study was conducted among three cohorts of first-year university students at the University of the Western Cape from 2007 to 2009. A range of correlates of sexual activity versus non-activity were explored using logistic regression analysis. The predicted probabilities of the logit link function depict marked differences between genders and racial groups. Males were more likely than females to be sexually active when entering university and the Black racial group was more likely than other racial groups to be sexually active. Risk-taking behaviours such as smoking, alcohol and drug use were shown to increase the likelihood of being sexually active when entering university, as did indicators of depression and suicidal ideation. The results indicate that religion plays an important role in influencing sexual behaviour, highlighting the important potential role that religious organisations can play in addressing HIV risk at tertiary institutions.

The Dynamic Association between Healthy Leisure and Substance Use in South African Adolescents: A State and Trait Perspective.

South Africa has an increasing adolescent substance use problem, lack of leisure opportunities and resources, and high adolescent discretionary time. How aspects of leisure relate to adolescent substance use is not well understood. Little research has been conducted on the leisure behaviors and experiences of South African adolescents, if and how those behaviors are associated with substance use, and ecological influences on those associations. By applying multi-level models to longitudinal data obtained from youth living in high-risk contexts, this research examines the association between state and trait healthy leisure and adolescent substance use and how perceived parental over-control moderates those associations. Results indicate healthy leisure protects against substance use at state and trait levels, provides empirical support that risk behavior can be addressed through leisure-based interventions, and emphasizes the importance of both short- and long-term processes when considering the context-dependent nature of adolescents' leisure experiences.

Correlates of Sexual Activity Versus Non-Activity of Incoming First-Year Students at a South African University

In order to contribute to the design of more effective programmes to curb the spread of HIV at tertiary institutions; this study compares the profile of students who are sexually active versus those who are not yet sexually active when entering university. The study was conducted among three cohorts of first-year university students at the University of the Western Cape from 2007 to 2009. A range of correlates of sexual activity versus non-activity were explored using logistic regression analysis. The predicted probabilities of the logit link function depict marked differences between genders and racial groups. Males were more likely than females to be sexually active when entering university and the Black racial group was more likely than other racial groups to be sexually active. Risk-taking behaviours such as smoking; alcohol and drug use were shown to increase the likelihood of being sexually active when entering university; as did indicators of depression and suicidal ideation. The results indicate that religion plays an important role in influencing sexual behaviour; highlighting the important potential role that religious organisations can play in addressing HIV risk at tertiary institutions

Translational Research in South Africa: Evaluating Implementation Quality Using a Factorial Design.

BACKGROUND: HealthWise South Africa: Life Skills for Adolescents (HW) is an evidence-based substance use and sexual risk prevention program that emphasizes the positive use of leisure time. Since 2000, this program has evolved from pilot testing through an efficacy trial involving over 7,000 youth in the Cape Town area. Beginning in 2011, through 2015, we are undertaking a new study that expands HW to all schools in the Metro South Education District. OBJECTIVE: This paper describes a research study designed in partnership with our South African collaborators that examines three factors hypothesized to affect the quality and fidelity of HW implementation: enhanced teacher training; teacher support, structure and supervision; and enhanced school environment. METHODS: Teachers and students from 56 schools in the Cape Town area will participate in this study. Teacher observations are the primary means of collecting data on factors affecting implementation quality. These factors address the practical concerns of teachers and schools related to likelihood of use and cost-effectiveness, and are hypothesized to be "active ingredients" related to high-quality program implementation in real-world settings. An innovative factorial experimental design was chosen to enable estimation of the individual effect of each of the three factors. RESULTS: Because this paper describes the conceptualization of our study, results are not yet available. CONCLUSIONS: The results of this study may have both substantive and methodological implications for advancing Type 2 translational research.

AIDS fatigue and university students' talk about HIV risk.

Drawing on a qualitative study that included 20 focus group discussions with male and female students at an urban-based university in South Africa, this article reports on perceptions, attitudes and reported behaviour with respect to HIV and AIDS and safer sex in the campus setting, with an aim to better understand how young people are responding to the challenges of HIV and AIDS in contemporary South Africa. The findings demonstrate the gap between reported HIV-prevention knowledge and safer-sex practices among a group of young and educated South Africans. Although the participants reported that students were knowledgeable about HIV and had easy access to condoms on campus, a range of factors mediated their capacity to apply this knowledge to safer-sex practices. Besides the usual set of complex social-cultural dynamics, including normative gender roles and power inequalities between men and women, socioeconomic challenges, and differences in age and status between sexual partners, the findings reveal substantial denial, stigma and HIV/AIDS 'fatigue.' The findings point to the importance of seeking creative ways to impart HIV-prevention and safer-sex messages that are not explicitly referent to HIV but link rather with broader issues concerning relationships, lifestyle and identity, and hence are responsive to the particular cultural context of university campuses.