Showing papers by "San Diego State University published in 2004"

Relationships between media use, body fatness and physical activity in children and youth: A meta-analysis

Abstract: OBJECTIVE: To review the empirical evidence of associations between television (TV) viewing, video/computer game use and (a) body fatness, and (b) physical activity. DESIGN: Meta-analysis. METHOD: Published English-language studies were located from computerized literature searches, bibliographies of primary studies and narrative reviews, and manual searches of personal archives. Included studies presented at least one empirical association between TV viewing, video/computer game use and body fatness or physical activity among samples of children and youth aged 3–18 y. MAIN OUTCOME MEASURE: The mean sample-weighted corrected effect size (Pearson r). RESULTS: Based on data from 52 independent samples, the mean sample-weighted effect size between TV viewing and body fatness was 0.066 (95% CI=0.056–0.078; total N=44 707). The sample-weighted fully corrected effect size was 0.084. Based on data from six independent samples, the mean sample-weighted effect size between video/computer game use and body fatness was 0.070 (95% CI=−0.048 to 0.188; total N=1722). The sample-weighted fully corrected effect size was 0.128. Based on data from 39 independent samples, the mean sample-weighted effect size between TV viewing and physical activity was −0.096 (95% CI=−0.080 to −0.112; total N=141 505). The sample-weighted fully corrected effect size was −0.129. Based on data from 10 independent samples, the mean sample-weighted effect size between video/computer game use and physical activity was −0.104 (95% CI=−0.080 to −0.128; total N=119 942). The sample-weighted fully corrected effect size was −0.141. CONCLUSION: A statistically significant relationship exists between TV viewing and body fatness among children and youth although it is likely to be too small to be of substantial clinical relevance. The relationship between TV viewing and physical activity is small but negative. The strength of these relationships remains virtually unchanged even after correcting for common sources of bias known to impact study outcomes. While the total amount of time per day engaged in sedentary behavior is inevitably prohibitive of physical activity, media-based inactivity may be unfairly implicated in recent epidemiologic trends of overweight and obesity among children and youth. Relationships between sedentary behavior and health are unlikely to be explained using single markers of inactivity, such as TV viewing or video/computer game use.

Mental health need and access to mental health services by youths involved with child welfare: a national survey.

Abstract: Objective This study assessed the relationship between the need for and use of mental health services among a nationally representative sample of children who were investigated by child welfare agencies after reported maltreatment. Method Data were collected at study entry into the National Survey of Child and Adolescent Well-Being and were weighted to provide population estimates. Results Nearly half (47.9%) of the youths aged 2 to 14 years ( N = 3,803) with completed child welfare investigations had clinically significant emotional or behavioral problems. Youths with mental health need (defined by a clinical range score on the Child Behavior Checklist) were much more likely to receive mental health services than lower scoring youth; still, only one fourth of such youths received any specialty mental health care during the previous 12 months. Clinical need was related to receipt of mental health care across all age groups (odds ratio=2.7–3.5). In addition, for young children (2–5 years), sexual abuse (versus neglect) increased access to mental health services. For latency-age youths, African-American race and living at home significantly reduced the likelihood of care. Adolescents living at home were also less likely to receive services, whereas having a parent with severe mental illness increased (odds ratio=2.4) the likelihood of service use. Conclusions Routine screening for mental health need and increasing access to mental health professionals for further evaluation and treatment should be a priority for children early in their contact with the child welfare system.

Leadership and Procedural Justice Climate as Antecedents of Unit-Level Organizational Citizenship Behavior.

Abstract: Despite an abundance of research conducted on organizational citizenship behavior (OCB) at the individual level of analysis, relatively little is known about unit-level OCB. To investigate the antecedents of unit-level OCB, data were collected from employees of 249 grocery store departments. Structural equation modeling techniques were used to test a model in which procedural justice climate was hypothesized to partially mediate the relationship between leadership behavior (servant-leadership) and unit-level OCB. Models were tested using both employee ratings and manager ratings of unit-level OCB. The results gave general support for the hypotheses, although there were some differences depending on the source of the OCB ratings (supervisor or subordinate), whether the type of department was controlled for, and whether a common method variance factor was included. Overall, the evidence generally supported the association of both servant-leadership and procedural justice climate with unit-level OCB. Building on the current study, a multilevel framework for the study of OCB is presented in conjunction with a discussion of future research directions in four specific areas.

Active transportation and physical activity: opportunities for collaboration on transportation and public health research

Abstract: Physically inactive lifestyles are a major public health challenge, and research in the transportation field on influences on the choice to walk and bike may provide guidance toward solutions. In the interests of promoting effective collaboration among the transportation, planning, and health fields, the current paper was written to fulfill three purposes. The first purpose was to summarize the transportation and planning studies on the relation between community design and non-motorized (“active”) transport and to interpret these studies from a health perspective. The second purpose was to summarize studies from the health literature that examine the relation between physical environmental variables and leisure-time physical activity that have relevance for transportation research. The third purpose was to promote more collaboration among transportation, planning, and health investigators by identifying opportunities for transdisciplinary research.

Penetrance of the Fragile X–Associated Tremor/Ataxia Syndrome in a Premutation Carrier Population

Abstract: ContextPremutation expansions (55-200 CGG repeats) of the fragile X mental retardation 1 (FMR1) gene are frequent in the general population, with estimated prevalences of 1 per 259 females and 1 per 813 males. Several articles have recently described the presence of late-onset neurological symptoms in male carriers of premutation (FMR1) alleles. The main clinical features described in this newly identified syndrome are cerebellar ataxia and intention tremor. Additional documented symptoms include short-term memory loss, executive functional deficits, cognitive decline, parkinsonism, peripheral neuropathy, lower-limb proximal muscle weakness, and autonomic dysfunction.ObjectiveTo study the penetrance of the fragile X–associated tremor/ataxia syndrome (FXTAS) among premutation carriers.Design, Setting, and ParticipantsFamily-based study of 192 individuals (premutation carriers and controls) whose families belong to the Northern or Southern California Fragile X Associations. Data were collected (March 2002-April 2003) through a survey and a standardized neurological examination, which was videotaped and subsequently scored in a blinded fashion.Main Outcome MeasuresPenetrance of intention tremor and ataxia among adult carriers (aged ≥50 years) of premutation expansions of the FMR1 gene.ResultsData from the survey of 192 individuals demonstrated an age-related penetrance of the combination of reported intention tremor and gait ataxia in male carriers (17%, 38%, 47%, and 75% [lower-bound estimates] for participants aged 50-59, 60-69, 70-79, and ≥80 years, respectively). The male carrier group had an age-adjusted 13-fold increased risk (95% confidence interval, 3.9-25.4; P = .003) of combined intention tremor and gait ataxia when compared with male controls. The clinical examination data from 93 individuals demonstrated that male carriers experienced more difficulties on each of 3 standardized neurological rating scales compared with controls (P<.05). Female carrier scores were also higher than those of female controls (P<.05) on 2 of the 3 neurological rating scales, but no participant was identified with probable or definite FXTAS.ConclusionsThe study demonstrates that older male carriers of premutation alleles of the FMR1 gene are at high risk of developing FXTAS. Since male premutation carriers are relatively common in the general population, older men with ataxia and intention tremor should be screened for the FMR1 mutation, especially if these signs are accompanied by parkinsonism, autonomic dysfunction, or cognitive decline, regardless of family history.

The effects of mindfulness meditation on cognitive processes and affect in patients with past depression.

Abstract: This study describes the effects of an 8-week course in Mindfulness-Based Stress Reduction (MBSR; J. Kabat-Zinn, 1982, 1990) on affective symptoms (depression and anxiety), dysfunctional attitudes, and rumination. Given the focus of mindfulness meditation (MM) in modifying cognitive processes, it was hypothesized that the primary change in MM practice involves reductions in ruminative tendencies. We studied a sample of individuals with lifetime mood disorders who were assessed prior to and upon completion of an MBSR course. We also compared a waitlist sample matched with a subset of the MBSR completers. Overall, the results suggest that MM practice primarily leads to decreases in ruminative thinking, even after controlling for reductions in affective symptoms and dysfunctional beliefs.

Hostility, anger, aggressiveness, and coronary heart disease: an interpersonal perspective on personality, emotion, and health.

Abstract: The related traits of hostility, anger, and aggressiveness have long been suggested as risk factors for coronary heart disease (CHD). Our prior review of this literature (Smith, 1992) found both considerable evidence in support of this hypothesis and important limitations that precluded firm conclusions. In the present review, we discuss recent research on the assessment of these traits, their association with CHD and longevity, and mechanisms possibly underlying the association. In doing so, we illustrate the value of the interpersonal tradition in personality psychology (Sullivan, 1953; Leary, 1957; Carson, 1969; Kiesler, 1996) for not only research on the health consequences of hostility, anger, and aggressiveness, but also for the general study of the effects of emotion, personality and other psychosocial characteristics on physical health.

Transfer of photosynthesis genes to and from Prochlorococcus viruses

Abstract: Comparative genomics gives us a new window into phage–host interactions and their evolutionary implications. Here we report the presence of genes central to oxygenic photosynthesis in the genomes of three phages from two viral families (Myoviridae and Podoviridae) that infect the marine cyanobacterium Prochlorococcus. The genes that encode the photosystem II core reaction center protein D1 (psbA), and a high-light-inducible protein (HLIP) (hli) are present in all three genomes. Both myoviruses contain additional hli gene types, and one of them encodes the second photosystem II core reaction center protein D2 (psbD), whereas the other encodes the photosynthetic electron transport proteins plastocyanin (petE) and ferredoxin (petF). These uninterrupted, full-length genes are conserved in their amino acid sequence, suggesting that they encode functional proteins that may help maintain photosynthetic activity during infection. Phylogenetic analyses show that phage D1, D2, and HLIP proteins cluster with those from Prochlorococcus, indicating that they are of cyanobacterial origin. Their distribution among several Prochlorococcus clades further suggests that the genes encoding these proteins were transferred from host to phage multiple times. Phage HLIPs cluster with multicopy types found exclusively in Prochlorocococus, suggesting that phage may be mediating the expansion of the hli gene family by transferring these genes back to their hosts after a period of evolution in the phage. These gene transfers are likely to play a role in the fitness landscape of hosts and phages in the surface oceans.

Assessment of Children: WISC-IV and WPPSI-III Supplement

Abstract: Chapter 1: Weschler Intelligence Scale for Children-IV (WISC-IV): Description A Note about Terminology Standardization Standard Scores, Scaled Scores, and Test-Age Equivalents Reliability Validity Intercorrelations for Subtests and Composites Demographic Variables Factor Analysis Range of Subtest and Process Score Scaled Scores Range of Full Scale IQs Comparison of the WISC-IV and WISC-III Administering the WISC-IV Short Forms Choosing Between the WISC-IV and the WPPSI-III and Between the WISC-IV and the WAIS-III Administering the WISC-IV to Children with Disabilities Assets Limitations Concluding Comment Thinking Through the Issues Summary Key Terms, Concepts, and Names Study Questions

Constructing the Spatial Weights Matrix Using a Local Statistic

Abstract: Spatial weights matrices are necessary elements in most regression models where a representation of spatial structure is needed. We construct a spatial weights matrix, W, based on the principle that spatial structure should be considered in a two-part framework, those units that evoke a distance effect, and those that do not. Our two-variable local statistics model (LSM) is based on the G i * local statistic. The local statistic concept depends on the designation of a critical distance, d c , defined as the distance beyond which no discernible increase in clustering of high or low values exists. In a series of simulation experiments LSM is compared to well-known spatial weights matrix specifications – two different contiguity configurations, three different inverse distance formulations, and three semi-variance models. The simulation experiments are carried out on a random spatial pattern and two types of spatial clustering patterns. The LSM performed best according to the Akaike Information Criterion, a spatial autoregressive coefficient evaluation, and Moran’s I tests on residuals. The flexibility inherent in the LSM allows for its favorable performance when compared to the rigidity of the global models.

RHESSys: Regional Hydro-Ecologic Simulation System—An Object- Oriented Approach to Spatially Distributed Modeling of Carbon, Water, and Nutrient Cycling

Abstract: Process-based models that can represent multiple and interacting processes provide a framework for combining field-based measure- ments with evolving science-based models of specific hydroecological processes. Use of these models, however, requires that the representation of processes and key assumptions involved be understood by the user community. This paper provides a full description of process implementation in the most recent version of the Regional Hydro-Ecological Simulation System (RHESSys), a model that has been applied in a wide variety of research

Organizational citizenship behavior in work groups: a group norms approach.

Abstract: Although the relationship between unit-level organizational citizenship behavior (OCB) and unit outcomes has been well established in recent years, the conceptual development of OCB at the unit level of analysis has not been adequately addressed. In an effort to fill this conceptual gap and to spur future research, the authors apply the literature on group norms to the concept of OCB. The resulting framework suggests a cyclical relationship between individual- and group-level processes and ultimately offers an explanation for how OCB norms are established and maintained in work groups. The authors demonstrate how this framework incorporates past research on the relationship between unit-level OCB and unit outcomes and how it extends previous research by suggesting multiple directions for future efforts related to unit-level OCB.

Households contaminated by environmental tobacco smoke: sources of infant exposures

Abstract: Objectives: To examine (1) whether dust and surfaces in households of smokers are contaminated with environmental tobacco smoke (ETS); (2) whether smoking parents can protect their infants by smoking outside and away from the infant; and (3) whether contaminated dust, surfaces, and air contribute to ETS exposure in infants. Design: Quasi-experiment comparing three types of households with infants: (1) non-smokers who believe they have protected their children from ETS; (2) smokers who believe they have protected their children from ETS; (3) smokers who expose their children to ETS. Setting: Homes of smokers and non-smokers. Participants: Smoking and non-smoking mothers and their infants ⩽ 1 year. Main outcome measures: ETS contamination as measured by nicotine in household dust, indoor air, and household surfaces. ETS exposure as measured by cotinine levels in infant urine. Results: ETS contamination and ETS exposure were 5–7 times higher in households of smokers trying to protect their infants by smoking outdoors than in households of non-smokers. ETS contamination and exposure were 3–8 times higher in households of smokers who exposed their infants to ETS by smoking indoors than in households of smokers trying to protect their children by smoking outdoors. Conclusions: Dust and surfaces in homes of smokers are contaminated with ETS. Infants of smokers are at risk of ETS exposure in their homes through dust, surfaces, and air. Smoking outside the home and away from the infant reduces but does not completely protect a smoker’s home from ETS contamination and a smoker’s infant from ETS exposure.

Child Anxiety in Primary Care: Prevalent But Untreated.

Abstract: We present prevalence and treatment utilization rates for child anxiety disorders in a university-affiliated primary care clinic. Families were recruited from a pediatric patient list and 714 families participated in an initial study wherein they completed child anxiety questionnaires. According to parent and child self-report questionnaires (n=714), 22% and 20% of children, respectively, were above a suggested clinical cutoff on a brief anxiety screen; 19% and 14% of children exceeded clinical cutoffs on a separate social anxiety questionnaire. All families were invited to participate in a second study that included the Anxiety Disorders Interview Schedule for Children-Parent Version and questions about treatment utilization; telephone interviews with 190 parents showed 1-year prevalence rates of DSM-IV child disorders to be 10.0% (se=2.2%) for specific phobia, 6.8% (se=1.8%) for social phobia, 3.2% (se=1.3%) for generalized anxiety disorder, 0.5% (se=.7%) for selective mutism, 1.6% (se=.9%) for major depressive disorder, 1.1% (se=.7%) for dysthymia, and 12.6% (se=2.4%) for attention deficit-hyperactivity disorder (ADHD). Among children with a current anxiety disorder, 31% had received counseling or medication treatment during their lifetime, compared to 40% of children with depression and 79% with ADHD. Adolescent age and being Caucasian were predictors of psychotherapy use; having an ADHD diagnosis was a predictor of both psychotherapy and medication use. The high prevalence of impairing anxiety disorders, in concert with the very low extent of treatment utilization, suggests a need for methods to identify and disseminate empirically validated treatments for these disorders in the primary care setting.

Physical activity and sedentary behaviours in youth: issues and controversies

Abstract: There is growing concern over the effects of sedentary lifestyles on the health of young people Recent rapid increases in juvenile obesity have received a great deal of attention in the scientific and popular press and have been attributed partly to television viewing, computer games and other sedentary behaviours These are thought to compete with physical activity There is a 'moral panic' concerning the 'couch kids' culture in modern western society Project STIL (Sedentary Teenagers and Inactive Lifestyles) at Loughborough University is investigating 'what young people do' and focuses on active and inactive pursuits chosen in their leisure time The following issues are addressed in this paper with specific reference to young people: how do we define 'sedentary behaviour' and do key sedentary behaviours displace physical activity? Are key sedentary behaviours obesogenic? What are the secular trends for children and youth for TV viewing? Our results for young people suggest that: 1 TV viewing and video-game playing are largely uncorrelated with physical activity, suggesting that there is time for both 2 meta-analytic findings show that body fatness is not related in any clinically meaningful way with key sedentary behaviours 3 although more children and youth have greater access to TVs than in previous generations, the amount of TV watched per head has not changed for 40 years Preliminary findings from Project STIL suggest that inactivity is more complex that we sometimes think Indeed, measures of 'couch potato-ism', such as TV viewing, may be inappropriate markers of inactivity

It's Beyond My Control: A Cross-Temporal Meta-Analysis of Increasing Externality in Locus of Control, 1960-2002

Abstract: Two meta-analyses found that young Americans increasingly believe their lives are controlled by outside forces rather than their own efforts. Locus of control scores became substantially more external (about .80 standard deviations) in college student and child samples between 1960 and 2002. The average college student in 2002 had a more external locus of control than 80% of college students in the early 1960s. Birth cohort/time period explains 14% of the variance in locus of control scores. The data included 97 samples of college students (n = 18,310) and 41 samples of children ages 9 to 14 (n = 6,554) gathered from dissertation research. The results are consistent with an alienation model positing increases in cynicism, individualism, and the self-serving bias. The implications are almost uniformly negative, as externality is correlated with poor school achievement, helplessness, ineffective stress management, decreased self-control, and depression.

Socioeconomic status and perceptions of access and safety for physical activity.

Abstract: Background: Environmental factors may play an important role on influencing physical activity (PA) behaviors.Purpose: Perceptions of access and safety for PA were compared among residents who were stratified as low or high in socioeconomic status (SES).Methods: Residents of a U.S. southeastern county (N = 1,194, 18–96 years of age) were contacted using a random-digit-dial method and asked about neighborhood and community environmental supports for PA. A Geographic Information System (GIS) was used to identify trails, sidewalks, public recreation facilities, and violent crime incidents.Results: A cluster analysis identified 10 census tracts as low SES and 11 census tracts as high SES (median household income, owner-occupied houses). More African Americans (66.5%) than Whites (33.5%) were classified as living in low-SES areas. Respondents from low-SES areas also reported engaging in less PA based on Centers for Disease Control and Prevention and American College of Sports Medicine recommendations than respondents from high-SES areas (p < .05). Respondents from low-SES (vs. high-SES) areas reported higher perceptions of neighborhood crime, unattended dogs, unpleasantness of neighborhoods, untrustworthy neighbors, and less access to public recreation facilities (ps < .05). GIS data for presence of sidewalks, recreation facilities, and crime did not support these differences in perceptions; however, respondents from low-SES (vs. high-SES) areas had substantially fewer trails. Having and using trails in one’s community predicted sufficient PA and walking for 150 min/week for low-SES respondents but not for high SES respondents (ps = .05, adjusted for covariates).Conclusions: Having access to trails is an important environmental feature among low-SES communities and should be the focus of future community-based PA interventions.

Depression and cardiovascular sequelae in postmenopausal women. The Women's Health Initiative (WHI)

Abstract: Background Subclinical depression, often clinically unrecognized, may pose increased risk of cardiovascular disease. Few studies have prospectively investigated cardiovascular events related to depression in older women. We describe prevalence, cardiovascular correlates, and relationship to subsequent cardiovascular events of depressive symptoms among generally healthy postmenopausal women. Methods The Women's Health Initiative Observational Study followed up 93 676 women for an average of 4.1 years. Depression was measured at baseline with a short form of the Center for Epidemiological Studies Depression Scale. Risks of cardiovascular disease (CVD) events were estimated from Cox proportional hazards models adjusting for multiple demographic, clinical, and risk factor covariates. Results Current depressive symptoms above the screening cutoff point were reported by 15.8% of women. Depression was significantly related to CVD risk and comorbidity (odds ratios ranging from 1.12 for hypertension to 1.60 for history of stroke or angina). Among women with no history of CVD, depression was an independent predictor of CVD death (relative risk, 1.50) and all-cause mortality (relative risk, 1.32) after adjustment for age, race, education, income, diabetes, hypertension, smoking, high cholesterol level requiring medication, body mass index, and physical activity. Taking antidepressant medications did not alter the depression-associated risks associated. Conclusions A large proportion of older women report levels of depressive symptoms that are significantly related to increased risk of CVD death and all-cause mortality, even after controlling for established CVD risk factors. Whether early recognition and treatment of subclinical depression will lower CVD risk remains to be determined in clinical trials.

What is a TOT? Cognate and translation effects on tip-of-the-tongue states in Spanish-English and tagalog-English bilinguals.

Abstract: The authors induced tip-of-the-tongue states (TOTs) for English words in monolinguals and bilinguals using picture stimuli with cognate (e.g., vampire, which is vampiro in Spanish) and noncognate (e.g., funnel, which is embudo in Spanish) names. Bilinguals had more TOTs than did monolinguals unless the target pictures had translatable cognate names, and bilinguals had fewer TOTs for noncognates they were later able to translate. TOT rates for the same targets in monolinguals indicated that these effects could not be attributed to target difficulty. Two popular TOT accounts must be modified to explain cognate and translatability facilitation effects, and cross-language interference cannot explain bilinguals' increased TOTs rates. Instead the authors propose that, relative to monolinguals, bilinguals are less able to activate representations specific to each language.

Medical Interpreting and Cross-cultural Communication

Abstract: List of figures List of tables Acknowledgements List of abbreviations Prologue 1 Questioning invisibility 2 Communication in the medical encounter 3 A different set of lenses 4 California Hope: a public hospital in changing times 5 Putting it all together 6 Finding visibility 7 Interpreters' voices 8 Emerging metaphors and final words References Index

Women's Preferences for Male Behavioral Displays Change Across the Menstrual Cycle

Abstract: Women prefer both the scent of symmetrical men and masculine male faces more during the fertile (late follicular and ovulatory) phases of their menstrual cycles than during their infertile (e.g., luteal) phases. Men's behavioral displays in social settings may convey signals that affect women's attraction to men even more strongly. This study examined shifts in women's preferences for these behavioral displays. A sample of 237 normally ovulating women viewed 36 or 40 videotaped men who were competing for a potential lunch date and then rated each man's attractiveness as a short-term and a long-term mate. As predicted, women's preference for men who displayed social presence and direct intrasexual competitiveness increased on high-fertility days relative to low-fertility days, but only in a short-term, not a long-term, mating context. These findings add to the growing literature indicating that women's mate pref- erences systematically vary across the reproductive cycle.

Constraints experienced by beginning secondary science teachers in implementing scientific inquiry lessons

Abstract: ‘Science as inquiry’ is a key content standard in the National Science Education Standards to be enacted by US science teachers. This paper is the result of a study that was conducted in order to understand factors that impacted the inquiry-based instruction of 14 beginning secondary science teachers. These teachers were part of a collaborative university/school district induction program designed to facilitate inquiry-based instruction. For a period of 1 year, the teachers were followed in an attempt to understand their teaching beliefs, instructional practices, knowledge of the nature of science and scientific inquiry, and their experiences with inquiry instruction in the classroom. Case and cross-case comparisons revealed five main constraints that impacted their enactment of inquiry-based instruction: an understanding of the nature of science and scientific inquiry, content knowledge, pedagogical content knowledge, teaching beliefs, and concerns about management and students. This study reinforces the...