Search results for "longitudinal"
showing 10 items of 1501 documents
Longitudinal Associations of Fitness, Motor Competence, and Adiposity with Cognition
2019
Purpose: The purpose of this study was to investigate the longitudinal associations of cardiorespiratory fitness (CRF), motor competence (MC), and body fat percentage (BF%) with cognition in children. Methods: Altogether, 371 children (188 boys and 183 girls) 6–9 yr of age at baseline participated in this 2-yr follow-up study. We assessed CRF by maximal cycle ergometer test, computed the MC score from the z-scores of the 50-m shuttle run, static balance, and box and block test results, measured BF% by dual-energy x-ray absorptiometry, and assessed cognition using the Raven’s Coloured Progressive Matrices (RCPM) score. The associations were studied by linear regression analysis and repeated-…
Early-onset tobacco use and suicide-related behavior – A prospective study from adolescence to young adulthood
2018
Abstract Background Developmental relationships between tobacco use and suicide-related behaviors (SRB) remain unclear. Our objective was to investigate the longitudinal associations of tobacco use in adolescence and SRB in adulthood. Methods Using a prospective design, we examined whether tobacco use in adolescence is associated with SRB (intentional self-injury, suicide ideation) in young adulthood in a population-based sample of 1330 twins (626 males, 704 females). The baseline and follow-up data were collected by professionally administered semi-structured poly-diagnostic interviews at ages 14 and 22, respectively. Results After adjusting for multiple potential confounders, those who re…
The heritability of depressive symptoms: multiple informants and multiple measures
2002
Background: Earlier research suggests large rater differences in heritability estimates of children's depressive symptoms in the context of significant age and sex-limitation effects. Methods: With data from an ongoing, population-based twin-family study, we estimated genetic and environmental influences on children's depression with models allowing for sex-specific effects. Our assessments of twins included self-reports and ratings made by their classmate peers, their parents and their teachers, allowing estimates of genetic and environmental effects with data from different informants. Model-fitting used maximum likelihood estimation of log-transformed data from a sample of 1,366 11- and …
Splenic marginal zone lymphoma: A prognostic model for clinical use
2006
The Integruppo Italiano Linfomi (IIL) carried out a study to assess the outcomes of splenic marginal zone lymphoma and to identify prognostic factors in 309 patients. The 5-year cause-specific survival (CSS) rate was 76%. In univariate analysis, the parameters predictive of shorter CSS were hemoglobin levels below 12 g/dL (P < .001), albumin levels below 3.5 g/dL (P = .001), International Prognostic Index (IPI) scores of 2 to 3 (P < .001), lactate dehydrogenase (LDH) levels above normal (P < .001), age older than 60 years (P = .01), platelet counts below 100 000/μL (P = .04), HbsAg-positivity (P = .01), and no splenectomy at diagnosis (P = .006). Values that maintained a negative influence …
Associations of temperament types and gender of early adolescents and teachers with adolescents’ school well‐being
2021
This study examined the role of temperament type and gender of adolescents and teachers in adolescents’ well‐being in school. The sample consisted of 677 Finnish students and 56 classroom teachers. Parents rated adolescent temperament and teachers rated their own temperament in autumn of Grade 6. Self‐reports of school well‐being among adolescents were obtained in autumn and the fall of Grade 6. The results showed that being a girl and having resilient temperament type predicted higher school well‐being. In turn, boys with undercontrolled temperament, who were otherwise at risk for decreased school well‐being, particularly benefited from having a female teacher with resilient temperament. O…
Early maturation and substance use across adolescence and young adulthood: A longitudinal study of Finnish twins.
2017
AbstractEarly maturation, indexed by pubertal development (PD), has been associated with earlier initiation and greater frequency of adolescent substance use, but this relationship may be biased by confounding factors and effects that change across development. Using a population-based Finnish twin sample (N = 3,632 individuals), we conducted twin modeling and multilevel structural equation modeling of the relationship between PD and substance use at ages 12–22. Shared environmental factors contributed to early PD and heavier substance use for females. Biological father absence was associated with early PD for boys but not girls, and did not account for the relationship between PD and subst…
Genetic and Environmental Influences Underlying Externalizing Behaviors, Cigarette Smoking and Illicit Drug Use Across Adolescence
2012
We investigated genetic and environmental influences common to adolescent externalizing behavior (at age 12), smoking (at age 14) and initiation of drug use (at age 17) using the FinnTwin12 cohort data. Multivariate Cholesky models were fit to data from 737 monozygotic and 722 dizygotic twin pairs. Heritability of externalizing behavior was 56%, that of smoking initiation/amount 20/32%, and initiation of drug use 27%. In the best-fitting model common environmental influences explained most of the covariance between externalizing behavior and smoking initiation (69%) and amount (77%). Covariance between smoking initiation/amount and drug use was due to additive genetic (42/22%) and common en…
Setting-up tension in the style of Marantaceae
2008
The Marantaceae stand out from other plant families through their unique style movement which is combined with a highly derived form of secondary pollen presentation. Although known for a long time, the mechanism underlying the movement is not yet understood. In this paper, we report an investigation into the biomechanical principles of this movement. For the first time we experimentally confirm that, in Maranta noctiflora, longitudinal growth of the maturing style within the 'straitjacket' of the hooded staminode involves both arresting of the style before tripping and building up of potential for the movement. The longer the style grows in relation to the enclosing hooded staminode, the m…
Do Financial Crises Moderate Entrepreneurial Recipes? A Comparative Fuzzy Analysis
2016
ABSTRACTThis study performs a fuzzy set qualitative comparative analysis (fsQCA) on entrepreneurial recipes. The research focuses on the moderating role of the 2007 financial crisis on the antecedents of entrepreneurship. Standard regressions analysis proves insufficient to uncover asymmetrical and complex relationships that explain the effect of credit constraints on new business. Empirical results on longitudinal data suggest that the crisis moderated entrepreneurial recipes in Spain. This research contributes to QCA analysis by studying moderation effects on time-series data.
B2B services: IT adoption in travel agency supply chains
2008
PurposeThe purpose of this paper is to examine and test a model which integrates the antecedents and consequences of adopting information technology (IT) with suppliers (i.e. online communication and e‐procurement) in the context of the travel agency supply chain.Design/methodology/approachA mail survey was conducted among 101 managers of travel agencies. A structured questionnaire was developed to measure the informants' scores on a set of the model constructs (i.e. IT adoption, B2B interactions, environmental factors, sales performance, efficiency, and relationship development).FindingsThe findings confirm the influence of e‐communication on e‐procurement in supply chains. Regarding the a…