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The effects of chronic arsenic exposure from drinking water on the neurobehavioral development in adolescence.

This cross-sectional study examined the possible influence on the development of cognitive function among adolescents due to long-term arsenic exposure. Forty-nine junior school students drinking arsenic-containing well water and 60 controls matched with age, sex, education, body height, body weight, body mass index, and socioeconomic status were compared. The former was divided into two groups: high and low exposure, with mean cumulative arsenic levels of 520629.0+/-605824.2 and 13782.2+/-12886.0 ppm, respectively. Four neurobehavioral tests including continuous performance test (CPT), symbol digit (SD), pattern memory (PM) and switching attention (SA) were applied. A strong correlation between age and education caused collinearity in the multiple regression model (r=0.84, P<0.0001). Only education and sex, excluding age, were entered into the model as covariates. Pattern memory and switching attention were significantly affected by long-term cumulative exposure to arsenic after adjusting for education and sex. It is suggested that the arsenic levels in the well water may be monitored extensively, but if there is no intervention, then neurobehavioral function will not be protected. Limitations of the current study require replication of this effect in other studies to confirm this conclusion.

Adolescent↗

Rethinking the associations between television viewing and adolescent sexuality development: bringing gender into focus.

PURPOSE: To investigate associations between adolescents' television viewing, their sexual behavior, and their perceptions of having power and control in sexual situations (i.e., sexual agency). This study incorporates results from a recent content analysis of television and attends to the different motives for and consequences of girls' and boys' sexual and relational behavior. METHODS: Adolescents (n = 703) aged 11 to 17 years from two public school districts in the Northeastern United States completed surveys assessing their television habits and sexual experiences. Survey data were combined with two content analyses, which assessed the frequency of sexual talk and behavior and the prevalence of gendered messages about sexuality (i.e., the Heterosexual Script) on primetime network television. RESULTS: Adolescents' sexual behavior and feelings of sexual agency were not associated with viewing sexual talk and sexual behavior on television, but were related to viewing the Heterosexual Script, particularly among girls. Girls who saw sexually objectified women and portrayals of men avoiding commitment more often reported less sexual agency. Girls who saw women acting as sexual gatekeepers more often were less sexually experienced and reported more sexual agency. Boys who saw men actively asserting their sexuality more often were less sexually experienced. CONCLUSIONS: The relationship between adolescents' television viewing and sexual experiences depends on the type of sexual messages viewed, the sexual outcome considered, and the gender of the viewer. Parents and practitioners should learn to identify the Heterosexual Script on television and encourage young people to negotiate sexual encounters in safe and positive ways.

Adolescent↗

Heterogeneity among juvenile antisocial behaviours: findings from the Virginia Twin Study of Adolescent Behavioural Development.

The examination of heterogeneity in antisocial behaviour was accomplished by applying latent class analytic methods to multivariate categorical data on 389 same-sex male twins, aged 11 to 16 from the Virginia Twin Study of Adolescent Behavioural Development (VTSABD). The data included multiple measures of oppositional and conduct disorder, attention deficit disorder, hyperactivity, impulsivity, reading disability and anxiety from mother, teacher, and child report from both questionnaire and interview (child and adult psychiatric assessment; CAPA). A latent four-class model provided a good fit to the data and yielded four phenotypically and aetiologically distinct latent classes: (1) a non-symptomatic class influenced by both additive genetic and shared environmental factors; (2) a hyperactivity-conduct disturbance class accounted for by both additive and non-additive genetic effects; (3) a 'pure' conduct disturbance class with a very strong shared environmental component; and (4) a multisymptomatic class explained entirely by the additive effect of the genes. Further characterization of these four latent classes by age of the child and parental psychiatric history is also shown.

Adolescent↗

Impact of disfiguring burn scars on adolescent sexual development.

It is popularly believed that disfiguring scars compromise the burned adolescent's ability to establish satisfactory dating relationships and to develop positive identities as sexually attractive people. The purpose of this study was to test that belief by obtaining information about the sexual behaviors and beliefs of adolescents who have disfiguring scars. Nineteen adolescents, ages 13 to 20 and at least 1 year postburn, completed a sexuality survey entitled What Young People Believe and Do--Revised. When compared with the available information, adolescents with disfiguring burn scars appear to have thoughts, feelings, and behaviors that are similar to those of nonburned adolescents. The severity of disfigurement as measured by numbers of affected body areas does not seem to be related to the sexual behaviors of the teenagers in this sample.

Adolescent↗

Adolescent cortical development: a critical period of vulnerability for addiction.

Cortical growth and remodeling continues from birth through youth and adolescence to stable adult levels changing slowly into senescence. There are critical periods of cortical development when specific experiences drive major synaptic rearrangements and learning that only occur during the critical period. For example, visual cortex is characterized by a critical period of plasticity involved in establishing visual acuity. Adolescence is defined by characteristic behaviors that include high levels of risk taking, exploration, novelty and sensation seeking, social interaction and play behaviors. In addition, adolescence is the final period of development of the adult during which talents, reasoning and complex adult behaviors mature. This maturation of behaviors corresponds with periods of marked changes in neurogenesis, cortical synaptic remodeling, neurotransmitter receptors and transporters, as well as major changes in hormones. Frontal cortical development is later in adolescence and likely contributes to refinement of reasoning, goal and priority setting, impulse control and evaluating long and short term rewards. Adolescent humans have high levels of binge drinking and experimentation with other drugs. This review presents findings supporting adolescence as a critical period of cortical development important for establishing life long adult characteristics that are disrupted by alcohol and drug use.

Adolescent↗

Family unemployment and its impact on adolescent personality development.

The issue of family unemployment is examined in terms of its effect on adolescent work values and self-concept. The subjects were 344 high school youths from an Israeli development town. The study findings show no significant differences among youth from families where the father is either employed or unemployed. These results tend to be consistent with other research in the sense that father's work status has little, if any, impact on adolescent family member's attitudes toward work and self.

Adolescent↗

Update: adolescent gynecology.

As adolescents develop their sexual identities they are at risk for acquiring sexually transmitted diseases, unwanted pregnancies, and cervical dysplasia. As physical growth and development progress during adolescence, the risk of developing dysmenoorhea or adverse effects from exposure to diethylstilbestrol increase. The pediatrician with a background in growth and development should be capable of recognizing these conditions and participating in their management.

Adenocarcinoma↗

A survey on growth and sexual development of adolescent students in Changhua City: growth of body height and weight.

In order to understand the physical growth and sexual development of contemporary adolescents, a cross-sectional survey was conducted during the period September 1983 to May 1984. The population came from all the pupils from 4th grade up, and all the junior and senior high students of Changhua City. By using stratified cluster sampling, 1419 boys and 1599 girls participated, ranging in age from 8 to 19 years. Body weight and height were measured. Growth spurt is a unique event during adolescence. It is well shown in the distance curves and pseudo-velocity curves of body height and weight. In boys, the growth spurt of height spanned from 12.0 to 14.8 years, with peak height velocity (PHV) at 13.5 years. In girls it was from 10.0 to 12.6 years and peaked at 11.5 years. The growth spurt of weight occurred from 12.0 to 15.9 years in boys with peak weight velocity (PWV) at 14.5 years, while girls had a growth spurt at 10.0-12.7 years with PWV at 11.5 years. Girls entered into the growth spurt about 2 years earlier, and also entered into PHV, PWV, two and three years earlier respectively than boys, while boys had a more intense and longer growth during the growth spurt than girls. Between 10.0-13.0 years girls were taller than boys, and between 12.0-13.0 years they were heavier than boys. However, from 13.5 years onward girls were soon surpassed by boys both in height and weight. Growth in height after 16.5 years in boys and after 15.5 in girls was minimal. Growth in weight in boys also became minimal after 16.5 years while girls weight even dropped a little bit after 16.5 years. At the mean age of 17.5 years, boys were 168.1 cm, girls were 156.2 cm in average, boys being 12 cm taller than girls after reaching their final height.

Adolescent↗

Religious involvement and adolescent psychosocial development.

The purpose of this study was to determine if religious involvement was associated with psychosocial maturity of adolescents as understood in Erikson's psychosocial theory. Three forms of religious involvement (attendance at religious services, participation in a Bible study group, and youth group involvement) were examined in relation to ego strengths, ideological and ethnic forms of identity, general self-esteem, and school self-esteem. Questionnaires were completed by 62 African-American and 63 European-American students in the 11th grade. All participants were from rural areas in West Virginia and of lower income status. Ego strengths of hope, will, purpose, fidelity, love, and care were associated with various forms of religious involvement. These associations were most apparent for European-Americans. Although ideological identity was not related to religious involvement, higher ethnic identity was associated with being African-American, especially for those more religiously involved. General self-esteem was not significant in the analyses, but school self-esteem was higher for each form of religious involvement.

Adolescent↗

Adolescent suicide.

In the introduction to this report our committee, with its focus on adolescent development, expressed its concern that adolescent suicidal behavior represented a grave crisis in the adolescent, a crisis not only in the development of the adolescent but one that endangers the existence of the adolescent. The possibility of a fatal outcome is abhorrent to us as physicians and psychiatrists, as it is to all those entrusted with the care and development of our fellow human beings. Consequently, we explored the ways in which developmental and other forces lead to adolescent suicide and the measures that can be taken to prevent it. We first considered the historical and cross-cultural aspects of suicidal behaviors. Societal and cultural stresses arise from parental attitudes, beliefs, expectations, and childrearing practices that evolve from the social and economic needs in each culture. If unbalanced by growth-sustaining supports, they may compromise or constrict the existential adaptive ability of the developing adolescent and place the adolescent at risk for suicide. Research into vulnerability in adolescence has revealed gender, ethnic, and geographic differences in the dimension of the problem and has indicated the social, psychological, and biological conditions that increase the likelihood that adolescents will resort to suicidal behaviors. Research is still needed to distinguish those adolescents who commit suicide from those adolescents with similar conditions who do not. Research has only begun to explore the ways in which the interaction of specific individual dynamics, precipitating events, and personal characteristics result in an adolescent's attempt of suicide. We discussed the strengths that adolescents acquire, but we emphasized the weaknesses that ensue as adolescents are faced with the impact of the thrust of their own biological, psychological, and social development with the forces inherent in their cultures. Adolescents progress through this period in their lives with varying and varied attempts to master, or cope with, the inevitable change in their existential status. Some try but fail and some fail to try, with resulting despair that can lead those adolescents to believe that suicide is the only choice they have to end their suffering. We described how psychodynamics can influence motivation, relationships, and behaviors, and how these may contribute to an outcome of suicide. Existing psychopathological conditions contribute. These include anxiety, dysthymia, posttraumatic stress disorders, acute reactive disorders, major affective disorders, severe conduct disorders, and psychotic disorders. We considered the possible lethal interplay between psychodynamic and psychopathological factors. This led to the crux of this report, a full discussion of prevention and treatment. The first and most important aspect of suicide prevention is early recognition of the adolescent at risk. It is of high priority to detect and treat those psychiatric disorders accompanied by greatest suicidal risk; depression, conduct disorders, substance abuse disorders, borderline conditions, and schizoaffective disorders. With all adolescents, threats of suicide must be taken seriously. There should be an immediate, complete psychiatric workup preferably before specific treatment begins. If crisis intervention must precede diagnostic study, the workup should not be delayed longer than necessary. Education of health care professionals, educators, families, and peers about warning signs can emphasize early intervention and thereby enable a skilled psychiatrist to assess suicidal thoughts, plans, means, and previous attempts, past and current life stresses, and available family and environmental support. All of this information will lead to a decision regarding hospitalization and treatment for the adolescent.(ABSTRACT TRUNCATED)

Adolescent↗

Late adolescent identity development: narrative meaning making and memory telling.

Personally important autobiographical memories are the smallest unit of the life story, which begins to emerge in adolescence. This study examined 2 features of self-defining memories in late adolescence, the meaning made of the memories to garner an understanding of the narrative construction of identity as a life story and how those memories were told with an emphasis on the functions for telling and audiences to understand the social component of narrative identity development. For late adolescents (N = 185), meaning was infrequently reported for the entertainment function in comparison with the self-explanation function. At later ages, adolescents' audiences were more likely to be peers, and at earlier ages, adolescents' audiences were more likely to be parents. Discussion focuses on the individual and social levels of identity construction that are apparent in personally important autobiographical memory narratives.

Adaptation, Psychological↗

Relationship of pain and symptoms to pubertal development in adolescents.

Temporomandibular disorder (TMD) pain, abdominal pain, migraine and tension-type headache are more prevalent in women than in men. This study assessed the relationship of back pain, headache, abdominal pain, TMD pain, and the presence of multiple pain conditions to gender and pubertal development in a cross-sectional, population-based survey of adolescents. We also examined the association between pubertal development and depressive and somatic symptoms, factors often associated with pain in adults. We hypothesized that prevalence of all pain conditions, as well as rates of other symptoms, would increase as puberty progresses in females, but not males. Subjects (3,101 boys and girls, 11-17 years old, selected from an HMO population) reported on the presence of each pain condition in the prior 3 months and completed scales assessing pubertal development, and depressive and somatic symptoms. Data were analyzed using descriptive statistics and multivariate logistic regression. Prevalence rates were weighted for factors affecting response. Prevalence of back pain, headache and TMD pain increased significantly (odds ratios, OR=1.4-2.0, P<0.001) and stomach pain increased marginally with increasing pubertal development in girls. Rates of somatization, depression and probability of experiencing multiple pains also increased with pubertal development in girls (P<0.0001). For boys, prevalence of back (OR=1.9, P<0.0001) and facial pain (OR=1.5, P<0.01) increased, stomach pain decreased somewhat and headache prevalence was virtually unchanged with increasing maturity. For both sexes, pubertal development was a better predictor of pain than was age. Thus it appears that pain, other somatic symptoms and depression increase systematically with pubertal development in girls.

Adolescent↗

Bulimic symptoms in the Virginia Twin Study of Adolescent Behavioral Development: correlates, comorbidity, and genetics.

BACKGROUND: This paper addresses bulimia symptoms in a large community sample of twins aged 8 to 17 years. We aim to identify environmental correlates of bulimia symptoms and relationships with other psychiatric disorder symptoms. The twin design allows examination of the structure of genetic and environmental effects. METHODS: DSM-IIIR bulimia symptoms and consequential impairment were measured by interview in the first wave of the Virginia Twin Study of Adolescent Behavioral Development. Comorbidity with other psychiatric symptoms and environmental correlates were examined and the relative contributions of genes and environment were assessed using structural equation modeling. RESULTS: An item-response theory model indicated that the range of bulimic symptoms represented a single underlying trait. Bulimia symptoms were more common in postmenarche girls and positively associated with body-mass index. Subdiagnostic symptomatology was associated with impairment in psychosocial functioning. Bulimia symptoms were strongly associated with other psychiatric disorders symptoms including anxiety and depression. Genetic model fitting identified strong additive genetic effects on the symptom score. Accounting for a potential violation of the equal environment assumption for identical and fraternal twins slightly reduced estimated genetic variance. CONCLUSIONS: The pattern of comorbidity suggests overlap between bulimia symptoms and those of internalizing disorders. Substantial genetic variance (44%) was evident in the most conservative model.

Adolescent↗