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PubMedDate not supplied

Patterns of physical symptoms and relationships with psychosocial factors in adolescents.

OBJECTIVES: Physical symptoms are common in otherwise healthy adolescents. This study sought to identify meaningful patterns of multiple physical symptoms and to examine relationships between the patterns and psychosocial factors. One-year stability of symptom patterns and factors contributing to stability were also examined. METHODS: This secondary data analysis used longitudinal data from a nationally representative sample of adolescents in grades 7 through 12 (n = 9,141) who participated in the National Longitudinal Study of Adolescent Health during 1994 to 1996. Ten selected physical symptoms (i.e., headache, stomachaches, fatigue) were used to construct clusters. Each cluster was compared in regard to demographic factors, psychological adjustment and interpersonal relationships. RESULTS: K-means in combination with Ward method clustered the sample into 4 groups according to the overall patterns of the 10 symptoms: nonsymptom (41%), moderate symptom (38%), high symptom (19%) and extreme symptom (2%). Adolescents in higher symptom clusters were more likely to be girls, nonwhites, or from families on welfare and reported high depressive symptoms, low self-esteem, and poor perceptions of parental affection and friendship quality. About 16% in clusters with lower symptom patterns develop somatizing patterns in Wave II; new onset was predicted by gender, younger age, and depressive symptoms. CONCLUSION: Symptom patterns characterized by overall high frequencies of multiple symptoms may indicate somatization. This study also suggests that adolescents with a somatizing tendency are more likely to experience psychological and interpersonal difficulties, and girls and younger adolescents are more vulnerable. Targeted prevention programs are needed for these vulnerable individuals by addressing their psychosocial functioning.

Adaptation, Psychological↗
PubMed2001

The small world inside large metabolic networks.

The metabolic network of the catabolic, energy and biosynthetic metabolism of Escherichia coli is a paradigmatic case for the large genetic and metabolic networks that functional genomics efforts are beginning to elucidate. To analyse the structure of previously unknown networks involving hundreds or thousands of components by simple visual inspection is impossible, and quantitative approaches are needed to analyse them. We have undertaken a graph theoretical analysis of the E. coli metabolic network and find that this network is a small-world graph, a type of graph distinct from both regular and random networks and observed in a variety of seemingly unrelated areas, such as friendship networks in sociology, the structure of electrical power grids, and the nervous system of Caenorhabditis elegans. Moreover, the connectivity of the metabolites follows a power law, another unusual but by no means rare statistical distribution. This provides an objective criterion for the centrality of the tricarboxylic acid cycle to metabolism. The small-world architecture may serve to minimize transition times between metabolic states, and contains evidence about the evolutionary history of metabolism.

Escherichia coli↗
PubMed2001

Structure of growing social networks.

We propose some simple models of the growth of social networks, based on three general principles: (1). meetings take place between pairs of individuals at a rate that is high if a pair has one or more mutual friends and low otherwise; (2). acquaintances between pairs of individuals who rarely meet decay over time; (3). there is an upper limit on the number of friendships an individual can maintain. Using computer simulations, we find that models that incorporate all of these features reproduce many of the features of real social networks, including high levels of clustering or network transitivity and strong community structure in which individuals have more links to others within their community than to individuals from other communities.

Journal Article↗
PubMed2003

Large-scale structural organization of social networks.

The characterization of large-scale structural organization of social networks is an important interdisciplinary problem. We show, by using scaling analysis and numerical computation, that the following factors are relevant for models of social networks: the correlation between friendship ties among people and the position of their social groups, as well as the correlation between the positions of different social groups to which a person belongs.

Journal Article↗
PubMed2003

Network bipartivity.

Systems with two types of agents with a preference for heterophilous interaction produce networks that are more or less close to bipartite. We propose two measures quantifying the notion of bipartivity. The two measures-one well known and natural, but computationally intractable, and the other computationally less complex, but also less intuitive-are examined on model networks that continuously interpolate between bipartite graphs and graphs with many odd circuits. We find that the bipartivity measures increase as we tune the control parameters of the test networks to intuitively increase the bipartivity, and thus conclude that the measures are quite relevant. We also measure and discuss the values of our bipartivity measures for empirical social networks (constructed from professional collaborations, Internet communities, and field surveys). Here we find, as expected, that networks arising from romantic online interaction have high, and professional collaboration networks have low, bipartivity values. In some other cases, probably due to low average degree of the network, the bipartivity measures cannot distinguish between romantic and friendship oriented interaction.

Journal Article↗
PubMed2006

System of mobile agents to model social networks.

We propose a model of mobile agents to construct social networks, based on a system of moving particles by keeping track of the collisions during their permanence in the system. We reproduce not only the degree distribution, clustering coefficient, and shortest path length of a large database of empirical friendship networks recently collected, but also some features related with their community structure. The model is completely characterized by the collision rate, and above a critical collision rate we find the emergence of a giant cluster in the universality class of two-dimensional percolation. Moreover, we propose possible schemes to reproduce other networks of particular social contacts, namely, sexual contacts.

Algorithms↗
PubMed2003

Doing the analysis differently. Using narrative to inform understanding of patient participation in contact tracing for sexually transmissible infections.

The aims and objectives of this paper were to understand the key influences hindering patients, participation in the contact tracing process for sexually transmissible infection exposure; to study the anatomy of acomplex sexual network through the eyes of a committed contact tracer and a group of teenagers; and to identify lessons from the research. Unstructured and group interviews were undertaken with a group of sixth form students and an unstructured interview with a contact tracer. Cue (storyboards) cards and hypothetical sexual networks were used--the outcome demonstrated that generated narrative about sexual network experiences can be analysed using a schema of representation of experience and could be subjected to Labov's structural categories for assignment of spheres of action, to undertake interpretation. Themes identified include: confidentiality, secrecy, friendship, community, the law and social sanctions. We conclude that contact tracing is under the spotlight and that we need to understand the personal experiences of being subjected to a process where little consideration has been given to the social and psychological consequences. Narrative analytic strategies can be applied to gain this much-needed rich data.

Adolescent↗
PubMedDate not supplied

The role of peers in the emergence of heterosexual romantic relationships in adolescence.

Adolescents' peer structures and the quality of their friendships were explored as antecedents of romantic relationships. Longitudinal data were gathered in a sample of 180 high school students over a 3-year period from grade 9 to grade 11. Consistent with Dunphy (1963), small groups of close friends were predictive of other-sex peer networks which were, in turn predictive of the emergence of future romantic relationships. Indirect effects were found for same-sex groups of close friends and same-sex networks. Consistent with Furman and Wehner (1994), the qualitative features of relationships with both friends and romantic partners were predictive of the qualitative features of subsequent romantic experiences. These linkages suggest ways in which peer relationships may support romantic development at this stage of the life cycle.

Adolescent↗
PubMedDate not supplied

Mutual antipathies and their significance in middle childhood and adolescence.

Mutual antipathies (when two children or adolescents dislike one another) were studied among 2,348 school-age children and 2,768 adolescents to determine incidence, gender and age differences, and implications for social adjustment. The children were more frequently involved than were the adolescents in same-sex antipathies but not mixed-sex ones. Boys were involved more frequently than were girls in same-sex antipathies, but involvement in mixed-sex antipathies was comparable for the two genders. With peer rejection scores used as a covariate, same-sex antipathies were associated with antisocial behavior and social withdrawal among children and adolescents of both genders and, in addition, to emotionality and lack of friendship support among adolescents. Mixed-sex antipathies were related to social adjustment depending on gender: these antipathies were related to antisocial and bullying behavior in boys but not girls; and to nonaggressiveness, victimization, lesser cooperation, shyness, and depression in girls but not boys. Mutual antipathies thus appear to be concomitants of adaptational risk in both childhood and adolescence.

Adolescent↗
PubMedDate not supplied

The role of sex hormone replacement therapy on self-perceived competence in adolescents with delayed puberty.

The objective of the present study was to determine the role of sex steroids in the development of self-perceived competence during adolescence. The Harter Self-Perception Scale was administered to 56 adolescents with delayed puberty who were receiving depo-testosterone (males) or conjugated estrogens (females) administered in 3-month blocks alternating with placebo. Treatment was given at three dose levels approximating early, middle, and late pubertal replacement levels. Hormone treatments had a significant positive effect for both males and females in one subscale domain--perceived job competence. Significant positive hormone effects were also obtained for perceptions of romantic appeal and close friendship in females and perception of athletic abilities in males. It can be inferred from the results of this study that the hormonal changes associated with sexual maturation have targeted influences on specific domains of self-perceived competence and that there are clear gender differences.

Adolescent↗
PubMed2003

Adult psychosocial functioning following childhood cancer: the different roles of sons' and daughters' relationships with their fathers and mothers.

BACKGROUND: Adult survivors of childhood cancer have impaired psychosocial functioning, but not much is known about the causes. In this study we examined the role of relationships with parents as a possible mediating factor. METHOD: One hundred and two adult survivors (82% of those eligible, 35 female and 57 male) of childhood Acute Lymphoblastic Leukaemia and Wilms' Tumour, and 102 matched controls (74% of those eligible) aged 19-30 were interviewed. Interpersonal and social role functioning, and current relationships with each parent were assessed in standardised investigator-based interviews with subjects. RESULTS: Adult survivors were more likely than controls to have impaired close relationships (love relationships and friendships), and poorer day-to-day coping. Lower encouragement from fathers and greater involvement with mothers were each independently associated with impaired close relationships outside the family. This association was evident across the sample and in the cancer survivor group. It was much stronger in young adult females. Lower paternal encouragement was also associated with poor day-to-day coping, and this association was stronger in young men. There was, however, little evidence that quality of relationships with parents mediated the link between childhood cancer and adult psychosocial functioning. CONCLUSIONS: Within this cross-sectional design we could not determine the direction of influence, nor exclude third variable effects. However, the findings indicate that mothers and fathers have different roles in the transition to adult life, and understanding these may assist the development of interventions designed to improve adult psychosocial functioning.

Adult↗
PubMed2004

Traits and stories: links between dispositional and narrative features of personality.

Dispositional traits and life narratives represent two different levels of personality that have not previously been empirically linked. The current study tested five hypotheses connecting Big-Five traits to life-narrative indices of emotional tone, theme, and structure. Students (Study 1) and adults (Study 2) completed a self-report measure of the Big-Five traits and provided extended written accounts of either ten (students) or eight (adults) key life-narrative scenes, including life high points, low points, and turning points. Content analysis of the narrative data revealed that for both samples Neuroticism was positively associated with an emotionally negative life-narrative tone, Agreeableness was correlated with narrative themes of communion (e.g., friendship, caring for others), and Openness was strongly associated with the structural complexity of life narrative accounts. Contrary to prediction, however, Conscientiousness was not consistently associated with themes of agency (e.g., achievement, self-mastery) and Extraversion was unrelated to positive narrative tone. The results are discussed in the context of contemporary research and theorizing on the narrative study of lives and the relation of narrative research in personality to more conventional, trait-based approaches.

Adolescent↗
PubMed2004

The importance of activities of daily living and social contact for loneliness: a survey among residents in nursing homes.

The aim of this study was to examine associations between functional ability to perform basic activities of daily living (ADL) functions (feeding, continence, going to the toilet, transferring from bed to chair, dressing and bathing), social contacts with family and friends/neighbours and emotional and social loneliness. A quantitative research approach, using a survey design, was performed. The sample comprised 113 subjects aged 65-101 years, living in nursing homes. Data were gathered through structured interviews by using the following measures: the modified Katz Index of ADL, the Revised Social Provisions Scale (SPS), and Family and Friendship Contacts Scale. Descriptive statistics, factor analyses, multiple correlation analyses and multiple regression analyses were used. Data showed a statistically significant relationship between dependence on the environment in carrying out ADL and low level of social loneliness. Likewise, high frequencies of social contact with sons, daughters and grandchildren had a statistically significant effect on low level of social loneliness. A confirmatory factor analysis (varimax rotation, eigenvalue 1.0) was employed to explore the two predefined dimensions (attachment and social integration) of the SPS. The results confirmed, to a very high degree, the two dimensions of the Weiss Model. Reliability (internal consistency), measured by Cronbach alpha, was 0.85 and 0.92, for attachment and social integration respectively. Based on this analysis, dependence in ADL function is important for a low level of social loneliness. From the present study it is concluded that ADL (feeding, continence, going to the toilet, transferring from bed to chair, dressing and bathing) and contact with a social network have a statistical effect on a low level of social loneliness. Hence, such associations may be of significance in nursing intervention and may influence the well-being of residents in nursing homes in different stages of life.

Activities of Daily Living↗
PubMed1992

Smoking: a special need?

The smoking behaviour of 665 children aged 12-15 years with special educational needs was compared with that of a control group of 842 children in mainstream education. Each child was interviewed using a structured questionnaire and reported smoking behaviour was validated against scores on a carbon monoxide monitor. We identified as the most at risk group children with emotional and behavioural disorders. They had the highest smoking rates and were the heaviest smokers. In contrast, children with learning difficulties had slightly lower smoking rates than those of the control. There were significant associations between the children's smoking behaviour and the smoking behaviour of siblings and 'other adults' in the household, belonging to single parent families, low self-esteem and large friendship groups. The reported smoking rates of the families of both groups of special needs children was found to be considerably higher than that in the control group or in the general population.

Achievement↗
PubMed1993

The importance of amount and location of drinking for the experience of alcohol-related problems.

People's self report of a variety of alcohol-related problems was collected as part of a national survey carried out in New Zealand in 1988. These problems included self perception of adverse effects of drinking on a number of life areas such as health, friendships and financial position; items covering tangible consequences of alcohol use and items suggestive of alcohol dependence. The experience of these problems was predicted from a number of socio-demographic variables and respondent's reports of their typical drinking behaviour. Of the socio-demographic variables only age was found to relate strongly to experience of problems. The overall frequency of drinking relatively large amounts and the typical quantity drunk in certain licensed premises (hotels, taverns and clubs) and the typical quantity drunk in others' homes predicted the experience of problems. These findings are similar to research from other countries using different methodologies and support the likely effectiveness of prevention strategies which reduce the access of young people to alcohol and which aim to influence the amounts consumed in drinking sessions on licensed premises.

Adolescent↗
PubMed2005

The effects of alcohol expectancies on drinking behaviour in peer groups: observations in a naturalistic setting.

AIMS: To study the functionality of alcohol expectancies in predicting drinking behaviour in existing peer groups of young adults in a 'naturalistic' setting. DESIGN AND SETTING: Young adults were invited to join an experiment with their peer group in a bar annex laboratory. During a 'break' of 50 minutes in this experiment, their activities, social behaviour and drinking behaviour were observed with digital video and audio equipment. PARTICIPANTS: Twenty-eight peer groups were involved in this study. A peer group consisted of seven to nine people, with relationships ranging from intimate relations and close friendships to being acquaintances. A total of 238 participants were involved. Measurements Information of the drinking behaviour from observations and questionnaire data on alcohol expectancies provide the opportunity to look at how and which expectancies are related to actual drinking patterns. Multiple regression and multi-level analyses were applied. FINDINGS: Expectancies on the positive and arousing effects of alcohol consumption were related to alcohol consumption in a naturalistic, social drinking situation, in addition to group effects of drinking. Expectancies on the negative and sedative effects of drinking, however, were not related to drinking. CONCLUSIONS: The findings indicate that among young adults observed in a peer group and naturalistic drinking setting, positive expectancies about the effects of alcohol and expectancies about the effects of alcohol on arousal are related positively to drinking level.

Adolescent↗