Predictors of adolescent dieting behaviors: A longitudinal study.

Research suggests that dieting is a risk factor for bulimia nervosa, yet little is known about the predictors of dieting. Accordingly, this study examined the correlates and prospective predictors of dieting in a community sample of 320 adolescent females (aged 16–19 yrs). Results indicate that body mass, pressure to be thin, thin-ideal internalization, body dissatisfaction, and binge eating were positively correlated with dieting. Moreover, body mass, pressure to be thin, body dissatisfaction, and binge eating prospectively predicted increased dieting over a 9-mo period. Multivariate analyses revealed that this set of predictors accounted for significant variance in concurrent and subsequent dieting, although only some of the unique effects were significant in the full models. Not only do these findings identify several risk factors for dieting, but they also suggest that dieting may be a response to bulimic pathology. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Parental influences on the dieting beliefs and behaviors of adolescent females in New Zealand

In 1909, in an isolated community hospital, on the northern tip of the Province of Newfoundland and Labrador, Canada, Dr. John Mason Little, Jr. performed electrical stimulation of the cerebral cortex, prior to cortical excision, as treatment of recurrent cerebral seizures in three patients. Extracts from Dr. Little's written records of the clinical features, the neurosurgical procedures and cerebral cortical stimulation are summarised. A brief review of the contemporaneous history of neurosurgical procedures for epilepsy provides a prospective of Dr. Little's remarkable surgical virtuosity.     

Problem dieting behaviors among young adolescents

OBJECTIVE: To examine dieting, eating and exercise behaviors, use of diet pills, and vomiting or use of laxatives to lose weight among younger adolescents. DESIGN: Analysis of data from a modified version of the Youth Risk Behavior Survey administered to middle school students in North Carolina in 1995. SETTING: Fifty-three randomly selected middle schools in North Carolina. SUBJECTS: Two thousand three hundred thirty-one students in the sixth, seventh, and eighth grades. INTERVENTIONS: None. MAIN OUTCOME MEASURES: Responses to questions regarding weight control practices, including vomiting or laxative use, dieting, exercise, or diet pill use. RESULTS: Of the students surveyed, 110 (9.7%) of the girls and 46 (4.0%) of the boys reported vomiting or using laxatives to lose weight. Among the girls, vomiting or laxative use was associated with feeling overweight, other weight loss practices, older age, being a poor student, smoking, eating more salads or vegetables, and eating more candy or other sweets (P< or =.01). A logistic regression model consisting of diet pill use, dieting to lose weight, lower academic achievement, and currently trying to lose weight correctly classified 92% of female students who had or had not vomited or used laxatives. Among boys, vomiting or laxative use was associated with feeling overweight, other weight loss practices, minority racial status, smoking, frequency of eating hamburgers or other high-fat meats, and frequency of eating french fries or potato chips (P< or =.01). A model consisting of diet pill use, minority race, dieting to lose weight, smoking, feeling overweight, and number of servings of hamburgers, hot dogs, or barbecue correctly classified 97% of the boys who had or had not vomited or used laxatives. CONCLUSION: Younger adolescents trying to lose weight engage in a variety of problem dieting and weight loss behaviors that can compromise health and may be associated with eating disorders.     

Measuring adolescent alcohol outcome expectancies.

The psychometric properties and construct validity of the Comprehensive Effects of Alcohol (CEOA) questionnaire were compared with those of the Alcohol Expectancy Questionnaire—Adolescent version (AEQ-A) in relation to adolescent alcohol consumption. Ss were aged 13–17 yrs. Both measures of adolescent alcohol expectancies were found to be internally reliable and temporally stable. Alcohol use was significantly associated with subjective evaluations for Cognitive and Behavioral Impairment and Self-Perception on the CEOA and with expected effects for Cognitive and Motor Impairment and Changes in Social Behavior on the AEQ-A. Compared with the AEQ-A, the CEOA explained more variance in quantity (28%) and a similar variance in frequency (15%) for adolescent alcohol use (AEQ-A quantity = 20%, frequency = 15%). Whereas the general content and psychometric properties of the 2 measures are markedly similar, the Likert response format, shorter length, and assessment of both expected effects and subjective evaluations with the CEOA may offer measurement advantages over the AEQ-A. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Internal–external expectancies and health-related behaviors.

Reviews research on internal–external (I–E) locus of control expectancies and health attitudes and behaviors. The theoretical background of the I–E construct is described. Topics include I–E relation to health knowledge, precautionary health practices, reactions to physical disorders, psychological responding, psychological disturbances, and responses to psychological treatment. (5? p ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Relationships between leisure time physical activity for exercise and other health-related behaviors

In this article the relationships between physical activity for exercise and other health-related behaviors is studied. The data analyzed were collected during 1991 by telephone in Glasgow and Edinburgh and concern 2418 male and 3053 female respondents between 18 and 60 years of age. In the analysis, respondents who reported exercising less than once in the previous week were contrasted with respondents who reported exercising more often. Compared with respondents exercising less often, respondents who reported exercising more often reported being smokers and adding salt to their food significantly less often, and more often reported drinking alcohol, using low-fat spread and engaging in weight-losing behavior. No significant relation was found between physical activity for exercise and seat-belt use among males and blood pressure checking among males and females.     

Relationships between parenting and adolescent adjustment over time: Genetic and environmental contributions.

The predictive association between parenting and adolescent adjustment has been assumed to be environmental; however, genetic and environmental contributions have not been examined. This article represents one effort to examine these associations in which a genetically informative design was used. Participants were 395 families with adolescent siblings who participated in the Nonshared Environment in Adolescent Development (D. Reiss et al., 1994) project at 2 times of assessment, 3 years apart. There were 5 sibling types in 2 types of families: 63 identical twins, 75 fraternal twins, and 58 full siblings in nondivorced families and 95 full, 60 half, and 44 genetically unrelated siblings in stepfamilies. Results indicate that the cross-lagged associations between parental conflict–negativity and adolescent antisocial behavior and depressive symptoms can be explained primarily by genetic factors. These findings emphasize the need to recognize and examine the impact that adolescents have on parenting and the contribution of genetic factors to developmental change. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Personal values as a mediator between parent and peer expectations and adolescent behaviors.

The current study examined the mediating role of adolescents' personal values on the relation between maternal and peer expectations for prosocial behaviors and adolescents' self-reported prosocial and antisocial behaviors. One hundred thirty-four adolescents (mean age = 16.22 years, 54% girls) completed measures of their own values and behaviors, as well as their perceptions of the positive expectations that their mother and their best friend(s) had for their (the adolescents') prosocial behaviors. Stepwise regression analyses suggested that adolescents' personal prosocial values mediated the relation between adolescents' perceptions of both maternal and peer expectations and adolescents' prosocial behaviors. In addition, for boys, perceptions of positive peer expectations were directly and negatively related to antisocial behaviors. The current study has important implications for parents, educators, and practitioners who are concerned about promoting adolescents' positive behaviors and discouraging negative behaviors. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

An application of expectancy theory to eating disorders: Development and validation of measures of eating and dieting expectancies.

Instruments for measuring learned expectations for reinforcement from eating and from dieting and thinness were constructed and validated. Five eating reinforcement expectancies and 1 dieting-thinness reinforcement expectancy were identified and their factor structure replicated on an independent sample. The expectancy that dieting and thinness lead to overgeneralized self-improvement characterized bulimia nervosa and anorexia nervosa patients and correlated with dieting behavior in a general sample. Expectancies for negative reinforcement from eating (e.g., eating helps manage negative affect) characterized bulimic but not anorexic individuals and were correlated with indexes of restraint plus disinhibition in a general sample. Positive reinforcement expectancies (e.g., eating is pleasurable and rewarding) were unrelated to disinhibited eating, but anorexic patients expected significantly less positive reinforcement from eating than did bulimic patients or controls. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Health-promoting behaviors of rural adolescent women

A part of a larger study of the health behaviors of adolescent women, this investigation examined health-promoting behaviors and the influence of cognitive, social, and environmental factors on these health-promoting behaviors of rural adolescent women. The sample consisted of 128 rural African-American and white adolescent women. Forty-four percent of the variance in health-promoting behavior of this sample was explained by five variables: self-image, problem solving, mother's education, employment status, and family structure. Self-image was the most salient predictor of health-promoting behavior, explaining 33% of the variance.     

Perceived consequences and adolescent drinking: Nonlinear and interactive models of alcohol expectancies.

Nonlinear and interactive models of alcohol expectancies and drinking were investigated using survey data obtained from junior and senior high school students on 2 occasions 2 years apart. Significant nonlinear and interactive effects were found in cross-sectional analyses. First, negative expectancies were most predictive when subjective likelihood was low. Second, drinking was highest when respondents believed that (a) negative consequences were unlikely and affective enhancement was likely and (b) both affective enhancement and social facilitation were likely. A simpler linear model was adequate for predicting changes in drinking, with both negative and affective enhancement expectancies having significant longitudinal effects. The results support the importance of alcohol expectancies but suggest that the relationships between these beliefs and adolescent drinking may be complex. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Thinness and eating expectancies predict subsequent binge-eating and purging behavior among adolescent girls.

One's expectancies for reinforcement from eating or from thinness are thought to represent summaries of one's eating-related learning history and to thus influence the development of binge-eating and purging behavior. In a 3-year longitudinal study, the authors tested this hypothesis and the hypothesis that binge eating also influences subsequent expectancy development. The authors used trajectory analysis to identify groups of middle school girls who followed different trajectories of binge eating, purging, eating expectancies, and thinness expectancies. Initial eating and thinness reinforcement expectancies identified girls whose binge eating and purging increased during middle school, and expectancies differentiated girls who began these problem behaviors from girls who did not. Initial binge-eating scores differentiated among eating expectancy developmental trajectories. The onset of most behaviors can be understood in terms of learned expectancies for reinforcement from these behaviors. The same model can be applied to the risk for eating disorders. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Parental work schedules and adolescent risky behaviors.

Using a large contemporary data set (the National Longitudinal Survey of Youth–Child Supplement), the authors examined the effects of parental work schedules on adolescent risky behaviors at age 13 or 14 and the mechanisms that might explain them. Structural equation modeling suggests mothers who worked more often at night spent significantly less time with children and had lower quality home environments, and these mediators were significantly linked to adolescent risky behaviors. Similar effects were not found for evening work schedules, while other types of maternal and paternal nonstandard work schedules were linked to higher parental knowledge of children's whereabouts, which led to lower levels of adolescent risky behaviors. Subgroup analyses revealed that boys, those in families with low incomes, and those whose mothers never worked at professional jobs may particularly be affected by mothers working at nights, due to spending less time together, having a lower degree of maternal closeness, and experiencing lower quality home environments. In addition, the effects of maternal night shifts were particularly pronounced if children were in the preschool or middle-childhood years when their mothers worked those schedules. Implications and avenues for future research are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The relationship between pre-, during-, post-treatment factors, and adolescent substance abuse behaviors

Extracellular electrical stimulation of the gray matter is often used to determine the function of a given cortical area or pathway. However, when it is used to elicit postsynaptic effects, the presynaptic neuronal elements activated by electrical stimulation have never been clearly identified: it could be the excitable dendrites, the cell body, the axon initial segment, or the axonal branches. To identify these elements, we performed two series of experiments on slices of rat visual cortex maintained in vitro. The first series of experiments, reported in this paper, was aimed at determining the chronaxie, a temporal parameter related to the membrane properties of the neuronal elements. In order to identify the presynaptic elements that were activated by extracellular electrical stimulation, chronaxies corresponding to postsynaptic responses were measured and compared with those corresponding to the activation of axons (antidromic activation) and those corresponding to the activation of cell bodies (intracellular current injection in intracellularly recorded neurons). The chronaxie for orthodromic activation was similar to that for axonal activation, but was 40 times smaller than the chronaxie for direct cell body activation. This suggests that, whenever a postsynaptic response is elicited after electrical stimulation of the cortical gray matter, axons (either axonal branches or axon initial segments), but not cell bodies, are the neuronal elements activated.     

Using alcohol expectancies to predict adolescent drinking behavior after one year.

An accumulating literature has shown the influence of childhood experiences associated with alcohol use on later drinking practices. Recent studies have suggested that alcohol-related expectancy may serve as an intervening variable to connect these early experiences with the later, proximal decision to drink when opportunities for actual alcohol consumption arise. Those studies, however, have collected expectancy and drinking data concurrently, whereas the present study for the first time reports on the power of expectancies measured in early adolescents (seventh and eighth grades) to predict self-reported drinking onset and drinking behavior measured a full year later. Results show that five of seven expectancy scores readily discriminated between nonproblem drinkers and those subsequently beginning problem drinking and accounted for a large portion of the variance in a continuous quantity/frequency index and a problem drinking index. The strength of these time-lagged relations strengthens the case for inferring that expectancies have causal power on drinking behavior and suggests prevention strategies. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Interactive effects of menarcheal status and dating on dieting and disordered eating among adolescent girls.

The effects of menarcheal status and opposite-sex socializing (mixed-sex social activity, dating, and noncoital sexual involvement with boyfriends) on dieting and disordered eating among early adolescent girls are examined. In all, 89 12- and 13-year-old girls reported their menarcheal status, dieting behaviors and attitudes, and involvement in dating and other heterosocial activities. Girls who are more involved in mixed-sex social activities are more likely to exhibit disordered eating tendencies, and this effect is stronger among girls who have experienced menarche. Also, girls who are dating and are more physically involved with boyfriends are more likely to report dieting and disordered eating than are their peers. An interaction between dating and menarcheal status was observed in the prediction of dieting and disordered eating, with dating more strongly linked to dieting and disordered eating among girls who have recently experienced menarche. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Parental alcohol involvement and adolescent alcohol expectancies predict alcohol involvement in male adolescents.

Current models of adolescent drinking behavior hypothesize that alcohol expectancies mediate the effects of other proximal and distal risk factors. This longitudinal study tested the hypothesis that the effects of parental alcohol involvement on their children's drinking behavior in mid-adolescence are mediated by the children's alcohol expectancies in early adolescence. A sample of 148 initially 9–11 year old boys and their parents from a high-risk population and a contrast group of community families completed measures of drinking behavior and alcohol expectancies over a 6-year interval. We analyzed data from middle childhood (M age = 10.4 years), early adolescence (M age = 13.5 years), and mid-adolescence (M age = 16.5 years). The sample was restricted only to adolescents who had begun to drink by mid-adolescence. Results from zero-inflated Poisson regression analyses showed that 1) maternal drinking during their children's middle childhood predicted number of drinking days in middle adolescence; 2) negative and positive alcohol expectancies in early adolescence predicted odds of any intoxication in middle adolescence; and 3) paternal alcoholism during their children's middle childhood and adolescents' alcohol expectancies in early adolescence predicted frequency of intoxication in middle adolescence. Contrary to predictions, child alcohol expectancies did not mediate the effects of parental alcohol involvement in this high-risk sample. Different aspects of parental alcohol involvement, along with early adolescent alcohol expectancies, independently predicted adolescent drinking behavior in middle adolescence. Alternative pathways for the influence of maternal and paternal alcohol involvement and implications for expectancy models of adolescent drinking behavior were discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Relationship between nicotine and alcohol expectancies and substance dependence.

The relation between nicotine and alcohol expectancies and lifetime nicotine and alcohol dependence was examined. Higher expectancies for nicotine and alcohol were found for nicotine and alcohol-dependent groups, respectively, compared with asymptomatic and nonusing groups. These data extend work showing a positive relation between level of smoking and expectancy by showing that, with level of use controlled statistically, enhanced expectancies are characteristic of persons meeting Diagnostic and Statistical Manual of Mental Disorders (3rd ed., rev.; American Psychiatric Association, 1987) criteria for nicotine dependence. A similar relation was found between alcohol expectancies and alcohol dependence. Implications for understanding the role of cognitive factors in drug dependence are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Relationships between adolescent sexual outcomes and exposure to sex in media: Robustness to propensity-based analysis.

Adolescent sexual health is a substantial problem in the United States, and two recent studies have linked adolescent sexual behavior and/or outcomes to youths' exposure to sex in the media. Both studies had longitudinal survey designs and used covariate-adjusted regression analysis. Steinberg and Monahan (2011) reanalyzed data from one of these studies (Brown et al., 2006) using a propensity score approach, arguing that this method better addresses the possibility of unobserved confounders. On the basis of their reanalysis, which found no relationship between media exposure and sexual behavior, Steinberg and Monahan concluded that “Adolescents' Exposure to Sexy Media Does Not Hasten the Initiation of Sexual Intercourse” (p. 562). We subjected data from the second study (Chandra et al., 2008; Collins et al., 2004) to reanalysis using a propensity-score approach. We find only modest reductions in two of the three previously documented associations and no reduction in the third. On the basis of these findings, we conclude that there is an association between exposure to sex in the media and adolescent sexual outcomes. Although the evidence does not prove causality, it is sufficient to advise caution among parents, develop interventions for youths, and work with media producers and distributors to reduce youth exposure to sexual content. (PsycINFO Database Record (c) 2011 APA, all rights reserved)     

Alcohol-related expectancies versus demographic/background variables in the prediction of adolescent drinking.

The best method currently available for predicting adolescent alcohol consumption is to use the significant relationship that has been found between this variable and demographic/background variables. To assess the theoretical and practical utility of adolescent alcohol expectancies, the present authors pitted these expectancies against important demographic/background variables in the prediction of adolescent drinking. This comparison required 3 procedural steps: (a) factor analytic derivation of 3 adolescent drinking styles, (b) multiple regression prediction of these drinking styles using demographic/background variables, and (c) assessment of the predictive power of alcohol expectancies. Ss were 1,580 12–19 yr olds. Results show that expectancies (as measured by the Alcohol Expectancy Questionnaire for Adolescents) at least equalled and even added to the predictive power of the background variables. Specifically, Ss who drank in a frequent, social manner expected alcohol to enhance their social behavior, whereas Ss who reported alcohol-related problems expected an improvement in their cognitive and motor functioning. Results suggest assessment and treatment strategies for high-risk adolescents and indicate a possible mediator of adolescent drinking problems. (27 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)