33 resultados para statistical significance


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Purpose – The aim of this exploratory study was to examine and compare a range of business values held by farmers and food processors.

Design/methodology/approach – Questionnaires with a section on business values were posted to 200 farmers and 200 food processing businesses in Victoria, Australia, with response rates of 44 per cent (n=69) and 31 per cent (n=48), respectively, achieved.

Findings – The most important of the 28 value items for farmers were high quality produce, honesty, and caring for employees. For processors, the most important values were quality products, customer value, and caring for employees. Between group differences reached statistical significance for one-third of the items. In particular, processor businesses valued innovation and convenience products more highly and had a stronger process orientation than did farming businesses. Environmental sustainability, caring for the community, and providing healthy products were more integral to farming than processing businesses.

Research limitations/implications –
The main limitation was the small sample sizes, although it is likely that response bias was not high. Future research could survey a larger sample of food industry representatives and examine the values held by other food industry sectors.

Practical implications –
This information could increase the effectiveness of communications with industry groups on a range of issues and in the formulation of appropriate health and environmental policies.

Originality/value – To the authors' knowledge, this is the first study to compare the values of farmers and food processors. This information is particularly important for those in the food industry and health and environmental policy makers.

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The aim of this research is to conduct a review on the approaches used to assess different criteria on sustainability used by supply chains and to suggest a framework for a methodical approach that would be easy and practical in making complex sustainable assessments. A review was conducted on the present models that are used to examine sustainability within supply chains. A sample of 332 companies mainly from the manufacturing area was examined to determine what criteria they require for assessing sustainable issues amongst their supply chains. A quantitative study using factor analysis and multiple regression were used to analyse the data to determine the statistical significance of the attempted prediction. It was identified that corporate commitment to sustainability, corporate reporting and management systems are significant predictors for green procurement in supply chain management. This framework can be beneficial in implementing environmental sustainable assessments for supply chains. Much of the empirical research on supply chains has focused on business performance, while there is very little empirical work undertaken in the literature on sustainable supply chains, Sustainability within supply chains implies that businesses need to consider the economic, environmental and social impacts of their activities.

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We investigated whether a composite genetic factor, based on the combined actions of catechol-O-methyltransferase (COMT) (Val158Met) and serotonin transporter (5HTTLPR) (Long-Short) functional loci, has a greater capacity to predict persistence of anxiety across adolescence than either locus in isolation. Analyses were performed on DNA collected from 962 young Australians participating in an eight-wave longitudinal study of mental health and well-being (Victorian Adolescent Health Cohort Study). When the effects of each locus were examined separately, small dose–response reductions in the odds of reporting persisting generalized (free-floating) anxiety across adolescence were observed for the COMT Met158 [odds ratio (OR) = 0.85, 95% confidence interval (CI) = 0.76–0.95, P = 0.004] and 5HTTLPR Short alleles (OR = 0.88, CI = 0.79–0.99, P = 0.033). There was no evidence for a dose–response interaction effect between loci. However, there was a double-recessive interaction effect in which the odds of reporting persisting generalized anxiety were more than twofold reduced (OR = 0.45, CI = 0.29–0.70, P < 0.001) among carriers homozygous for both the COMT Met158 and the 5HTTLPR Short alleles (Met158Met + Short-Short) compared with the remaining cohort. The double-recessive effect remained after multivariate adjustment for a range of psychosocial predictors of anxiety. Exploratory stratified analyses suggested that genetic protection may be more pronounced under conditions of high stress (insecure attachments and sexual abuse), although strata differences did not reach statistical significance. By describing the interaction between genetic loci, it may be possible to describe composite genetic factors that have a more substantial impact on psychosocial development than individual loci alone, and in doing so, enhance understanding of the contribution of constitutional processes in mental health outcomes.

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To determine the relationship between femoral neck geometry and the risk of hip fracture in post-menopausal Caucasian women, we conducted a retrospective study comparing the femoral neck dimensions of 62 hip fracture cases to those of 608 randomly selected controls. Measurements were made from dual-energy X-ray absorptiometry scans (Lunar DPX-L), using the manufacturers ruler function, and included: hip axis length (HAL), femoral neck axis length (FNAL), femoral neck width (FNW), femoral shaft width (FSW), medial femoral shaft cortical thickness (FSCTmed), and lateral femoral shaft cortical thickness (FSCTlat). The fracture group was older (median age 78.3 years vs 73.8 years), lighter (median weight 59.9 kg vs 64.5 kg), and, after adjustment for age, taller (mean height 158.7±0.8 cm vs 156.7±0.2 cm) than the controls. Furthermore, bone mineral density was lower in this group (0.682±0.016 g/cm2 vs 0.791±0.006 g/cm2). After adjustment for age, bone mineral content (BMC) or height, hip fracture patients had greater FNW (up to 6.6%) and FSW (up to 6.3%) than did the controls. Each standard deviation increase in FNW and FSW was associated with a 1.7-fold (95% CI 1.3–2.3) and a 2.4-fold (95% CI 1.8–3.2) increase in the fracture risk, respectively. BMC-adjusted FNAL was greater in the fracture group (+2.1%) than in the controls, while the age-adjusted FSCTmed was reduced (–7.2%). There was a trend towards longer HAL (up to 2.1%) after adjustment for age or BMC, and thinner age-adjusted FSCTlat (–1.7%) in fracture patients that did not reach statistical significance. In multivariate analysis, the risk of hip fracture was predicted by the combination of age, FNW, FSW, BMC and FSCTmed. HAL was not analyzed because of the small number of HAL measurements among fracture cases. We conclude that post-menopausal women with hip fractures have wider femoral necks and shafts, thinner femoral cortices and longer femoral neck axis lengths than do women with no fractures. Alteration in hip geometry is associated with the risk of hip fracture.

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Background Recent data suggest that 3-hydroxy-3-methylglutaryl coenzyme A reductase inhibitors (statins) decrease fracture risk and increase bone mineral density (BMD).

Methods This cross-sectional study is set in southeastern Australia. We evaluated the association between statin use, fracture risk, and BMD in 1375 women (573 with incident fractures and 802 without incident fracture, all drawn from the same community). Fractures were identified radiologically. Medication use and lifestyle factors were documented by questionnaire.

Results Unadjusted odds ratio for fracture associated with statin use was 0.40 (95% confidence interval [CI], 0.23-0.71). Adjusting for BMD at the femoral neck, spine, and whole body increased the odds ratio to 0.45 (95% CI, 0.25-0.80), 0.42 (95% CI, 0.24-0.75), and 0.43 (95% CI, 0.24-0.78), respectively. Adjusting for age, weight, concurrent medications, and lifestyle factors had no substantial effect on the odds ratio for fracture. Statin use was associated with a 3% greater adjusted BMD at the femoral neck (P = .08), and BMD tended to be greater at the spine and whole body but did not achieve statistical significance.

Conclusion The substantial 60% reduction in fracture risk associated with statin use is greater than would be expected from increases in BMD alone.

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Axotomized neurons have the innate ability to undergo regenerative sprouting but this is often impeded by the inhibitory central nervous system environment. To gain mechanistic insights into the key molecular determinates that specifically underlie neuronal regeneration at a transcriptomic level, we have undertaken a DNA microarray study on mature cortical neuronal clusters maintained in vitro at 8, 15, 24 and 48 hrs following complete axonal severance. A total of 305 genes, each with a minimum fold change of ±1.5 for at least one out of the four time points and which achieved statistical significance (one-way ANOVA, P < 0.05), were identified by DAVID and classified into 14 different functional clusters according to Gene Ontology. From our data, we conclude that post-injury regenerative sprouting is an intricate process that requires two distinct pathways. Firstly, it involves restructuring of the neurite cytoskeleton, determined by compound actin and microtubule dynamics, protein trafficking and concomitant modulation of both guidance cues and neurotrophic factors. Secondly, it elicits a cell survival response whereby genes are regulated to protect against oxidative stress, inflammation and cellular ion imbalance. Our data reveal that neurons have the capability to fight insults by elevating biological antioxidants, regulating secondary messengers, suppressing apoptotic genes, controlling ion-associated processes and by expressing cell cycle proteins that, in the context of neuronal injury, could potentially have functions outside their normal role in cell division. Overall, vigilant control of cell survival responses against pernicious secondary processes is vital to avoid cell death and ensure successful neurite regeneration.

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Based on student evaluation of teaching (SET) ratings from 1,432 units of study over a period of a year, representing 74,490 individual sets of ratings, and including a significant number of units offered in wholly online mode, we confirm the significant influence of class size, year level, and discipline area on at least some SET ratings. We also find online mode of offer to significantly influence at least some SET ratings. We reveal both the statistical significance and effect sizes of these influences, and find that the magnitudes of the effect sizes of all factors are small, but potentially cumulative. We also show that the influence of online mode of offer is of the same magnitude as the other 3 factors. These results support and extend the rating interpretation guides (RIGs) model proposed by Neumann and colleagues, and we present a general method for the development of a RIGs system.

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Objective : To investigate the relationship between socioeconomic status (SES) and reported perceptions of quality of life (QOL) in a cross-sectional population-based analysis of a representative sample of Australian men.

Methods : In 917 randomly recruited men aged 24–92 years, we measured QoL in the domains of physical health, psychological health, environment and social relationships, using the Australian World Health Organization Quality of Life Instrument (WHOQOL-BREF). Residential addresses were cross-referenced with Australian Bureau of Statistics 2006 census data to ascertain SES. Participants were categorised into lower, mid, or upper SES based on the Index of Relative Socioeconomic Disadvantage and Advantage (IRSAD), the Index of Economic Resources (IER), and the Index of Education and Occupation (IEO). Lifestyle and health information was self-reported.

Results : Males of lower SES reported poorer satisfaction with physical health (OR=0.6, 95%CI 0.4–0.9, p=0.02), psychological health (OR=0.4, 95%CI 0.3–.7, <0.001) and environment (OR=0.5, 95%CI 0.3–0.7, p<0.001), although not social relationships (p=0.59). The poorest QOL for each domain was observed in the lower and upper SES groups, representing an inverse U-shaped pattern of association; however, statistical significance was only observed for psychological  health (OR=0.5, 95%CI 0.4–0.7, p<0.001). These relationships were similar for IEO  and IER.

Conclusions : Men from lower and upper SES groups have lower QOL compared to their counterparts in the mid SES group.

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 In anticipation of helping students mature from passive to more active learners while engaging with the issues and concepts surrounding computer security, a student generated Multiple Choice Question (MCQ) learning strategy was designed and deployed as a replacement for an assessment task that was previously based on students providing solutions to a series of short-answer questions. To determine whether there was any educational value in students generating their own MCQs students were required to design MCQs. Prior to undertaking this assessment activity each participant completed a pre-test which consisted of 45 MCQs based on the topics of the assessment. Following the assessment activity the participants completed a post-test which consisted of the same MCQs as the pre-test. The pre and post test results as well as the post test and assessment activity results were tested for statistical significance. The results indicated that having students generate their own MCQs as a method of assessment did not have a negative effect on the learning experience. By providing a framework to the students based on the literature to support their engagement with the learning material, we believe the creation of well-structured MCQs resulted in a more advanced understanding of the relationships between the concepts of the learning material as compared with plainly answering a series of short-answer questions from a textbook. Further study is required to determine to what degree this learning strategy encouraged a deeper approach to learning.

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The purpose of this project, supported by the Office for Learning and Teaching (formerly the Australian Learning and Teaching Council), is to design and implement a framework that uses a distributed leadership approach for the quality management of Online Learning Environments (OLE) in Australian higher education. The third phase of the research for this project included an online survey of ACODE (Australasian Council on Open, Distance and E-Learning) institutional representatives at Australasian universities conducted during March 2012. A copy of the survey instrument that was employed is included as Appendix 1. The survey included items addressing:


• background/demographic information;
• respondents’ perceptions of importance of, and satisfaction with, elements of the proposed framework;
• respondents’ perceptions of the importance of possible interactions between elements of the proposed framework;
• respondents’ perceptions of the importance and effectiveness of distributed leadership at their universities;
• respondents’ perceptions of the importance, and evidence of presence, of a range of characteristics of distributed leadership at their universities; and
• respondents’ suggested strategies for building and sustaining effective institutional distributed leadership.

A total of 46 current ACODE institutional representatives were publicly identifiable, and were invited to participate in the online survey. Those institutions for which an ACODE representative could be identified are highlighted in Appendix 2. This report presents the results and findings of the survey. In all of the following quantitative analyses, a statistical significance level of p < 0.01 has been adopted. This significance level indicates that the observed result is likely to occur by chance only once for every hundred similar respondent samples, and hence strongly suggests that any observed difference in mean ratings is a real difference. 

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Purpose The purpose of this paper is to review how real estate students perceive and define commercial awareness, which is one of the most important employability skills. This paper also examines students’ perceptions about how their courses support and develop their commercial awareness. In addition, it compares students’ and academics’ views on commercial awareness and identifies whether there are any gaps.

Design/methodology/approach –
This paper presents the research findings of a questionnaire survey and e-mail discussions with students who are currently studying Royal Institution of Chartered Surveyors (RICS)-accredited real estate courses in the UK. The questionnaire aimed to gather students’ views on the definitions and components of commercial awareness and identify what skills and attributes are required for its development. It also evaluates how commercial awareness has been embedded in the real estate courses. The aim of each discussion was to gain deeper insight on how components of commercial awareness are embedded in real estate courses, and 17 discussions were conducted. The contents of the e-mail discussions were analysed and similar themes were identified and coded. The frequency of the answer in the questionnaire and comments from interviewees is presented. The findings from students’ views have been compared to published research reporting UK RICS-accredited real estate course providers’ views on commercial awareness. In addition to descriptive statistics, Fisher’s exact test was used to identify the statistical significance between the academics’ and students’ views on commercial awareness.

Findings –
The UK real estate students agreed that the most important definition of commercial awareness is a “person’s ability to understand the economics of business”. They agreed that “financial” component is the most important component of commercial awareness and it is the largest portion of their courses. The most important skill and attribute for commercial awareness development are “critical thinking” and “ability and willingness to update professional knowledge”, respectively. Although the descriptive analysis shows students and academics have different views on the definition and components of commercial awareness and its incorporation within real estate courses, the Fisher exact test shows that only a few elements are different enough to be statistically significant. This analysis shows that while students and academics have slightly different views on commercial awareness they are not very different.  Commercial awareness is an important employability skill, thus, it is still necessary for real estate academics to re-visit the curriculum and to ensure learning outcomes related to commercial awareness have been clearly explained and communicated to students. Furthermore, it is vital for students to obtain practical experience in order to fully develop their commercial awareness. 

Originality/value –
This paper is a pioneer study focused on reviewing real estate students’ views on commercial awareness, including identifying its definition, components and evaluating the extent to which commercial awareness has been embedded in their courses. It also identifies the skills and attributes that students thought were required for the development of commercial awareness.  Furthermore, it discusses students’ preferred ways of enhancing their commercial awareness as part of the course they are studying. It is the first study identifying the statistical difference between students’ and academics’ views on commercial awareness. The understanding of students’ views on commercial awareness, their preferred delivery method and the divergence between students’ and academics’ views on commercial awareness can provide useful insights for course directors on the development and renewal of real estate course curriculum

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Objective The objective was to investigate parents' motives for selecting foods for their children and the associations between these motives and children's food preferences. Design Cross-sectional survey. A modified version of the Food Choice Questionnaire was used to assess parents' food choice motives. Parents also reported children's liking/disliking of 176 food and beverage items on 5-point Likert scales. Patterns of food choice motives were examined with exploratory principal component analysis. Associations between motives and children's food preferences were assessed with linear regression while one-way and two-way ANOVA were used to test for sociodemographic differences. Setting Two Australian cities. Subjects Parents (n 371) of 2-5-year-old children. Results Health, nutrition and taste were key motivators for parents, whereas price, political concerns and advertising were among the motives considered least important. The more parents' food choice for their children was driven by what their children wanted, the less children liked vegetables (β =-0·27, P<0·01), fruit (β=-0·19, P<0·01) and cereals (β=-0·28, P<0·01) and the higher the number of untried foods (r=0·17, P<0·01). The reverse was found for parents' focus on natural/ethical motives (vegetables β=0·17, P<0·01; fruit β=0·17, P<0·01; cereals β=0·14, P=0·01). Health and nutrition motives bordered on statistical significance as predictors of children's fruit and vegetable preferences. Conclusions Although parents appear well intentioned in their motives for selecting children's foods, there are gaps to be addressed in the nature of such motives (e.g. selecting foods in line with the child's desires) or the translation of health motives into healthy food choices.

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BACKGROUND: Identification of risk factors within precursor syndromes, such as depression, anxiety or substance use disorders (SUD), might help to pinpoint high-risk stages where preventive interventions for Bipolar Disorder (BD) could be evaluated.

METHODS: We examined baseline demographic, clinical, quality of life, and temperament measures along with risk clusters among 52 young people seeking help for depression, anxiety or SUDs without psychosis or BD. The risk clusters included Bipolar At-Risk (BAR) and the Bipolarity Index as measures of bipolarity and the Ultra-High Risk assessment for psychosis. The participants were followed up for 12 months to identify conversion to BD. Those who converted and did not convert to BD were compared using Chi-Square and Mann Whitney U tests.

RESULTS: The sample was predominantly female (85%) and a majority had prior treatment (64%). Four participants converted to BD over the 1-year follow up period. Having an alcohol use disorder at baseline (75% vs 8%, χ(2)=14.1, p<0.001) or a family history of SUD (67% vs 12.5%, χ(2)=6.0, p=0.01) were associated with development of BD. The sub-threshold mania subgroup of BAR criteria was also associated with 12-month BD outcomes. The severity of depressive symptoms and cannabis use had high effects sizes of association with BD outcomes, without statistical significance.

CONCLUSIONS AND LIMITATIONS: The small number of conversions limited the power of the study to identify associations with risk factors that have previously been reported to predict BD. However, subthreshold affective symptoms and SUDs might predict the onset of BD among help-seeking young people with high-prevalence disorders.

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This report investigated whether suicide risk by occupational groups differed for males and females. We examined this using a sub-set of articles examined in a recent meta-analysis and stratified by gender. For certain occupational groups, males and females had a similar risk of suicide (the military, community service occupations, managers, and clerical workers). There was some indication of gender differences for other occupations (technicians, plant and machine operators and ship’s deck crew, craft and related trades workers, and professionals), although these did not reach statistical significance. These findings highlight the complexity of the relationship between occupation and suicide and suggest the possible role of a range of individual, work-related and social-environmental risk factors that may differ for males and females.

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OBJECTIVE: To evaluate the impact of the National Perinatal Depression Initiative on access to Medicare services for women at risk of perinatal mental illness. METHOD: Retrospective cohort study using difference-in-difference analytical methods to quantify the impact of the National Perinatal Depression Initiative policies on Medicare Benefits Schedule mental health usage by Australian women giving birth between 2006 and 2010. A random sample of women of reproductive age enrolled in Medicare who had not given birth where used as controls. The main outcome measures were the proportions of women giving birth each month who accessed a Medicare Benefits Schedule mental health items during the perinatal period (pregnancy through to the end of the first postnatal year) before and after the introduction of the National Perinatal Depression Initiative. RESULTS: The proportion of women giving birth who accessed at least one mental health item during the perinatal period increased from 88 to 141 per 1000 between 2007 and 2010. The difference-in-difference analysis showed that while there was an overall increase in Medicare Benefits Schedule mental health item access as a result of the National Perinatal Depression Initiative, this did not reach statistical significance. However, the National Perinatal Depression Initiative was found to significantly increase access in subpopulations of women, particularly those aged under 25 and over 34 years living in major cities. CONCLUSION: In the 2 years following its introduction, the National Perinatal Depression Initiative was found to have increased access to Medicare funded mental health services in particular groups of women. However, an overall increase across all groups did not reach statistical significance. Further studies are needed to assess the impact of the National Perinatal Depression Initiative on women during childbearing years, including access to tertiary care, the cost-effectiveness of the initiative, and mental health outcomes. It is recommended that new mental health policy initiatives incorporate a planned strategic approach to evaluation, which includes sufficient follow-up to assess the impact of public health strategies.