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Large Community Sample (large + community_sample)
Selected AbstractsThe genetics of tea and coffee drinking and preference for source of caffeine in a large community sample of Australian twinsADDICTION, Issue 10 2005Michelle Luciano ABSTRACT Aims To investigate the genetic and environmental influences on tea consumption and their commonalities with coffee consumption; and to further examine the genetic and environmental aetiology of preference for tea/coffee. Design A classical twin design was used in which the similarity of identical and non-identical twins is compared, enabling estimates of genetic, common environmental and unique environmental influence on the trait. Setting and participants An Australian population-based sample of 1796 identical (i.e. monozygotic) and 2013 non-identical (i.e. dizygotic) twin pairs aged 16,87 years was studied, roughly three-fifths of whom were female. The sample represented approximately 70% of those approached for study participation. Measurements As part of a Health and Lifestyle Questionnaire, respondents were asked how many cups of each tea and coffee they consumed per day. Additional measures of ,total tea and coffee consumption' and ,preference for coffee' were calculated. Findings Age was positively associated with tea consumption but negatively associated with coffee preference; women consumed more beverages than men, but showed a lower preference for coffee. An inverse relation between tea and coffee consumption,larger in females (,0.41) than males (,0.34),was supported. This association was mediated entirely by the unique environment in males, and by both the unique environment (68.3%) and genes (31.7%) in females. Tea and coffee drinking were shown to have similar heritabilities (0.46) in males, but tea consumption was influenced by common environmental factors whereas coffee consumption was not. Coffee preference was shown to be influenced by genes (0.42) and the unique environment (0.58). Conclusions As the patterns of genetic and environmental variation were shown to differ for tea and coffee consumption it may be more informative to retain them as separate measures of caffeine intake in future studies of stimulant use and taste perception. [source] Maximizing follow-up in longitudinal studies of traumatized populationsJOURNAL OF TRAUMATIC STRESS, Issue 6 2006Christy K. Scott Although longitudinal research is essential in understanding the nature and course of posttraumatic mental health problems, high rates of attrition often threaten the internal validity of such studies and make results hard to interpret. C. K. Scott (2004) developed an approach to minimizing attrition in longitudinal studies that consistently yielded retention rates in excess of 90% through to 2-year follow-up. In this article, the authors discuss the interface between trauma exposure and participation in longitudinal research, before describing in detail a model to address those effects. The effectiveness of the model is examined with reference to traumatic stress in a large community sample (N = 887) with eight waves of data over 2 years. [source] Self-reported health and cardiovascular reactions to psychological stress in a large community sample: Cross-sectional and prospective associationsPSYCHOPHYSIOLOGY, Issue 5 2009Anna C. Phillips Abstract Exaggerated cardiovascular reactions to acute psychological stress have been implicated in a number of adverse health outcomes. This study examined, in a large community sample, the cross-sectional and prospective associations between reactivity and self-reported health. Blood pressure and heart rate were measured at rest and in response to an arithmetic stress task. Self-reported health was assessed concurrently and 5 years later. In cross-sectional analyses, those with excellent/good self-reported health exhibited larger cardiovascular reactions than those with fair/poor subjective health. In prospective analyses, participants who had larger cardiovascular reactions to stress were more likely to report excellent/good health 5 years later, taking into account their reported health status at the earlier assessment. The findings suggest that greater cardiovascular reactivity may not always be associated with negative health outcomes. [source] Smoking, alcohol use and engagement in exercise and cognitive performance among older adultsAUSTRALASIAN JOURNAL ON AGEING, Issue 2 2002Janet Bryan Objectives: To examine cross-sectional and longitudinal effects of history of smoking, alcohol use and engagement in exercise on cognitive performance. Method: Health habits and cognitive performance of a large community sample of older adults were assessed at measurement points two years apart. Results: Past smokers performed more poorly on tests of recall and speed of information processing at times 1 and 2 than those who had never smoked. Past smokers and moderate users of alcohol performed better on confrontation naming and working memory, than those who had never smoked or drank alcohol. Engagement in exercise was related to immediate recall and speed of processing before, but not after, controlling for covariates. Health habits were not related to longitudinal change in cognition. Conclusions: The results suggest a negative effect of history of smoking on effortful cognitive tasks and a protective effect of alcohol use on more automatic cognitive tasks among older adults. [source] Linkage Analysis of Alcohol Dependence Symptoms in the CommunityALCOHOLISM, Issue 1 2010Narelle K. Hansell Background:, We have previously identified suggestive linkage for alcohol consumption in a community-based sample of Australian adults. In this companion paper, we explore the strength of genetic linkage signals for alcohol dependence symptoms. Methods:, An alcohol dependence symptom score, based on DSM-IIIR and DSM-IV criteria, was examined. Twins and their nontwin siblings (1,654 males, 2,518 females), aged 21 to 81 years, were interviewed, with 803 individuals interviewed on 2 occasions, approximately 10 years apart. Linkage analyses were conducted on datasets compiled to maximize data collected at either the younger or the older age. In addition, linkage was compared between full samples and truncated samples that excluded the lightest drinkers (approximately 10% of the sample). Results:, Suggestive peaks on chromosome 5p (LODs >2.2) were found in a region previously identified in alcohol linkage studies using clinical populations. Linkage signal strength was found to vary between full and truncated samples and when samples differed only on the collection age for a sample subset. Conclusions:, The results support the finding that large community samples can be informative in the study of alcohol-related traits. [source] Relations between different types of jealousy and self and partner perceptions of relationship qualityCLINICAL PSYCHOLOGY AND PSYCHOTHERAPY (AN INTERNATIONAL JOURNAL OF THEORY & PRACTICE), Issue 3 2007D. P. H. Barelds The present paper examines the relationships between relationship quality and three different types of jealousy, including both partners' levels of jealousy and perceptions of relationship quality. It was expected that jealousy in response to a direct threat to the relationship,that is, reactive jealousy,would be positively related to relationship quality, whereas forms of jealousy that may also be triggered in the absence of such a threat would be negatively related to relationship quality. Three studies were conducted among large community samples of heterosexual married and cohabiting couples (a total of 961 couples), using three different operationalizations of relationship quality. In all three studies both partners' levels of reactive jealousy related positively to relationship quality, whereas in all three studies, both partners' levels of anxious jealousy were negatively related to relationship quality. Findings and clinical implications are discussed.,Copyright © 2007 John Wiley & Sons, Ltd. [source] | |||||||||||||