Social class and smoking at age 15: the effect of different definitions of smoking

Aim : To explore whether the association between social class and smoking among teenagers varies according to the definition of smoking adopted. Design, setting and participants : A survey of 2196 15-year-olds in 43 secondary schools in the West of Scotland. Measures : Current smoking status and number of cigarettes smoked, and social class based on the occupation of the head of the household. Findings : 'Current smoker' was the only category not significantly differentiated by class; the ratio of smokers from unskilled compared with professional backgrounds rose with increasingly stringent definitions of smoking. Conclusion : The extent to which teenage smoking is patterned by social class depends on the definition of smoking adopted

Gender differences in weight-related concerns in early to mid adolescence

Among adults, women are more likely than men to perceive themselves as too heavy for their height, the gender discrepancy being greatest among those within a "normal" weight range. This finding has been explained in terms of the equation of female beauty with extreme thinness. As the physical changes of puberty are differentiated by gender, with males experiencing increased skeletal and muscle mass but females a gain in fat, this life stage has been seen as key for the development of female body dissatisfaction and associated problems such as lowered self esteem and eating disorders. In this analysis we compare changes in worries about putting on weight and dieting with actual body mass index at ages 11, 13, and 15

Being different: correlates of the experience of teasing and bullying at age 11

The public stereotype, largely supported by a rather diverse range of literature, is that bullied children differ from their peers in respect of attributes such as appearance, disability or school performance. In this paper we explore the characteristics of such victims in a way which is both more comprehensive than previous studies and in addition, considers and accounts for possible inter-relationships between variables. Self-report data on teasing and bullying (found to be strongly inter-related) were obtained from a large, school-based sample of 11 year-olds, with additional descriptions and ratings of the children from their parents, class teachers and nurses. Experience of teasing/bullying did not differ according to race, physical maturity or height, but was more likely among children who were less physically attractive, overweight, had a disability such as a sight, hearing or speech problem, and performed poorly at school. These factors were not only significant regardless of sex and social class, but also independent and thus additive in their effects. Characteristics of appearance, disability or ability which in themselves may be difficult to deal with also increase the likelihood that a child will experience the additional burden of being bullied

Young people's leisure and risk-taking behaviours: changes in gender patterning in the West of Scotland during the 1990s

Until the 1990s, the literature on youth leisure characterized that of females as home-based, passive and largely absent from male-dominated subcultures. Contrasting with this, over the course of the 1990s, evidence emerged of increasing public visibility, reduced restrictions on activities and relatively greater increases in health-risk behaviours among females, together with suggestions of a domestification of leisure among males This paper uses data from two cohorts of 15 year olds in the same geographical area (the West of Scotland), separated by 12 years (1987 and 1999) to examine changes in the gender patterning of young people's leisure, use of public space and risk taking (as represented by substance use) over this time period. Gender differences in 'street-based' (previously more males) and 'conventional/safe' (previously more females) leisure disappeared over this period while male excesses in watching sports and playing computer games increased. At the same time, female levels of drinking and experience of illicit drugs reached, and those of smoking overtook, their male counterparts. Additional analyses showed that changes in leisure activities over time accounted in part for the changing gender patterns in substance use. The paper discusses how greater public visibility and increased risk-taking behaviours among females have resulted from the lifting of constraints of respectability on young women's life- styles. These changes have been rapid and have significance in both social and health terms

Policy Recognition in the Abstract Hidden Markov Model

In this paper, we present a method for recognising an agent's behaviour in dynamic, noisy, uncertain domains, and across multiple levels of abstraction. We term this problem on-line plan recognition under uncertainty and view it generally as probabilistic inference on the stochastic process representing the execution of the agent's plan. Our contributions in this paper are twofold. In terms of probabilistic inference, we introduce the Abstract Hidden Markov Model (AHMM), a novel type of stochastic processes, provide its dynamic Bayesian network (DBN) structure and analyse the properties of this network. We then describe an application of the Rao-Blackwellised Particle Filter to the AHMM which allows us to construct an efficient, hybrid inference method for this model. In terms of plan recognition, we propose a novel plan recognition framework based on the AHMM as the plan execution model. The Rao-Blackwellised hybrid inference for AHMM can take advantage of the independence properties inherent in a model of plan execution, leading to an algorithm for online probabilistic plan recognition that scales well with the number of levels in the plan hierarchy. This illustrates that while stochastic models for plan execution can be complex, they exhibit special structures which, if exploited, can lead to efficient plan recognition algorithms. We demonstrate the usefulness of the AHMM framework via a behaviour recognition system in a complex spatial environment using distributed video surveillance data

Increasing EHR Use for Quality Improvement in Community Health Centers: The Role of Networks

Describes how five community health center networks helped implement electronic health records to improve chronic and preventive care, as well as the obstacles they faced, including limited software capabilities, funding, and ability to share resources

Prevalence of deliberate self harm and attempted suicide within contemporary Goth youth subculture: longitudinal cohort study

<b>Objective</b> To investigate whether deliberate self harm is associated with contemporary Goth youth subculture. <b>Design</b> Longitudinal cohort study. <b>Setting</b> School and community based study of young people living in the Central Clydeside Conurbation, Scotland. <b>Participants</b> 1258 people aged 19, surveyed in 2002-4 and followed-up since age 11 (1994). <b>Main outcome measures</b> Lifetime prevalence of self harm and attempted suicide and their association with Goth youth subculture, before and after adjusting for confounders. <b>Results</b> Identification as belonging to the Goth subculture was strongly associated with lifetime self harm and attempted suicide, with a prevalence of 53% and 47%, respectively among the most highly identified group, and evidence for a dose-response relation. Adjusting for potential confounders did not significantly attenuate this association. Analysis of other youth subcultures showed that this effect was primarily associated with Goth subculture. <b>Conclusions</b> Identification as belonging to the Goth subculture was the best predictor of self harm and attempted suicide. Although based on small numbers, additional longitudinal analysis suggests both selection and modelling mechanisms are involved, selection mechanisms possibly being more likely

A probabilistic framework for tracking in wide-area environments

Surveillance in wide-area spatial environments is characterised by complex spatial layouts, large state space, and the use of multiple cameras/sensors. To solve this problem, there is a need for representing the dynamic and noisy data in the tracking tasks, and dealing with them at different levels of detail. This requirement is particularly suited to the Layered Dynamic Probabilistic Network (LDPN), a special type of Dynamic Probabilistic Network (DPN). In this paper, we propose the use of LDPN as the integrated framework for tracking in wide-area environments. We illustrate, with the help of a synthetic tracking scenario, how the parameters of the LDPN can be estimated from training data, and then used to draw predictions and answer queries about unseen tracks at various levels of detail.<br /

E11, generalised space-time and equations of motion in four dimensions

We construct the non-linear realisation of the semi-direct product of E11 and its first fundamental representation at low levels in four dimensions. We include the fields for gravity, the scalars and the gauge fields as well as the duals of these fields. The generalised space-time, upon which the fields depend, consists of the usual coordinates of four dimensional space-time and Lorentz scalar coordinates which belong to the 56-dimensional representation of E7. We demand that the equations of motion are first order in derivatives of the generalised space-time and then show that they are essentially uniquely determined by the properties of the E11 Kac-Moody algebra and its first fundamental representation. The two lowest equations correctly describe the equations of motion of the scalars and the gauge fields once one takes the fields to depend only on the usual four dimensional space-time