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Northern bobwhite (Colinus virginianus) populations are irruptive along their western periphery. Previous research has failed to identify the factors associated with these irruptions, but precipitation is often assumed to be a primary causal factor. I hypothesize that the mechanism may involve demographic variables, specifically that birds entering their second breeding season are more successful than subadult breeders. A better understanding of age-specific survival and productivity in quail populations may be beneficial if managing for a population with an older age structure could ameliorate the irruptive cycles. Radiotagged bobwhites (n > 100 each year; approximately equal numbers (25) of each age-sex class) were followed throughout the breeding season (Mar. – Aug.) in 2003 and 2004 in Fisher County, Texas. Survival, nesting attempts, hatch rate, and clutch size were monitored. Probability of survival of radiotagged birds during the breeding season was S = 0.465 and S = 0.395 in 2003 and 2004, respectively; survival was similar among all age-sex classes. Nest success was greater in 2004 (52.4%, n = 42) than 2003 (28.6%, n = 35) and the 2004 breeding season was at least 20 days longer, likely due to more summer rainfall and cooler temperatures. Nest success was similar among adult and subadult hens in 2003 (4 of 21 adult nests, 6 of 14 subadult nests) and 2004 (16 of 28 adult nests, 7 of 14 subadult nests). Nest initiation was similar in 2003 (0.84 nests/adult hen vs. 0.61 nests/subadult hen), but adults initiated more nests than subadults in 2004 (1.04 nests/adult hen vs. 0.58 nests/subadult hen). Adult hens initiated 12 of 15 renesting attempts observed. Nest initiation dates and nest site selection were similar between adults and subadults. The adult:subadult ratios for 2003 and 2004 were 1:3.0 and 1:1.3 (n = 426 and n = 224, respectively). Extrapolating from the sample population, subadults contributed approximately 84% of the chicks fledged in 2003 but only 37% in 2004, while adults contributed 16% and 63% in 2003 and 2004, respectively. Results from this study suggest that if covey demographics are a component of bobwhite irruptions, the mechanism is most likely due to greater renesting effort by adult hens.

This thesis develops novel statistical methodology for estimating the incidence and the prevalence of Human Immunodeficiency Virus (HIV) using routinely collected surveillance data. The robust estimation of HIV incidence and prevalence is crucial to correctly evaluate the effectiveness of targeted public health interventions and to accurately predict the HIV- related burden imposed on healthcare services. Bayesian CD4-based multi-state back-calculation methods are a key tool for monitoring the HIV epidemic, providing estimates of HIV incidence and diagnosis rates by disentangling their competing contribution to the observed surveillance data. Improving the effectiveness of public health interventions, requires targeting specific age-groups at high risk of infection; however, existing methods are limited in that they do not allow for such subgroups to be identified. Therefore the methodological focus of this thesis lies in developing a rigorous statistical framework for age-dependent back-calculation in order to achieve the joint estimation of age-and-time dependent HIV incidence and diagnosis rates. Key challenges we specifically addressed include ensuring the computational feasibility of proposed methods, an issue that has previously hindered extensions of back-calculation, and achieving the joint modelling of time-and-age specific incidence. The suitability of non-parametric bivariate smoothing methods for modelling the age-and-time specific incidence has been investigated in detail within comprehensive simulation studies. Furthermore, in order to enhance the generalisability of the proposed model, we developed back-calculation that can admit surveillance data less rich in detail; these handle surveillance data collected from an intermediate point of the epidemic, or only available on a coarse scale, and concern both age-dependent and age-independent back-calculation. The applicability of the proposed methods is illustrated using routinely collected surveillance data from England and Wales, for the HIV epidemic among men who have sex with men (MSM).

Infants, toddlers and young children with cleft lip and palate (CLP) often present with multiple risk profiles due to the complex interaction between genotypical, phenotypical and environmental risk factors influencing their communication development at different ages. Current research recommends the need for a comprehensive early communication intervention (ECI) approach to the treatment of young children with CLP. The areas of strength and weakness in communication development and the factors influencing children with CLP at specific age-group intervals are under-emphasized. The aim of this study was to identify and describe the age-specific risk factors and assets which could influence the communication development of young children with CLP visiting a university-based ECI clinic, the Clinic for High-Risk Babies (CHRIB). Furthermore, the developmental areas of strength and weakness in the child with CLP at three specific age-group intervals, ranging from 1 month to 48 months were described. A retrospective, descriptive, between-subject developmental design with a correlation approach was employed. Purposive sampling was implemented as a non-randomized sampling method and 227 participants were included in the study. The data was extracted from the CHRIB database and analyzed by means of basic descriptive and advanced inferential statistical methods. Extensive data processing of all the potential factors that could have an influence on the early communication developmental areas of children with CLP was performed. A final analysis of the most important associations was performed in the SPSS. The findings revealed that expressive and receptive language and listening skills presented as the most vulnerable communication areas across all three age-groups. The cumulative effect of the risk factors was the greatest in the *[12;24) months age-group since this age group presented with the highest frequency of delayed communication development. The majority of participants in all three age-groups presented with areas of strength, which include age-appropriate cognitive skills, pragmatic development, gestural development and gross motor development. Low birth weight presented as a persistent phenotypical risk factor which influenced the development of functions related to language use in the [1;12) and [12;24) months age groups, and gross motor development and receptive language in the *[12;24) months age group. The environtypical factors such as education and occupation of the mother, as well as the type of day care, indicated significant associations with listening skill development in the [1;12) months group and with the development of functions relating to language use in the [12;24) months age group. Parent-child interaction showed recurrent significant associations with receptive and expressive language across the three age groups. The findings indicated that young children with CLP have unique communication profiles at different age intervals and that these age-specific risk factors and assets should be recognized to ensure a comprehensive approach to ECI services to these young children and their families. / Dissertation (MCommunication Pathology)--University of Pretoria, 2011. / Speech-Language Pathology and Audiology / Unrestricted

Introduction. This study examines the age-specific risk factors associated withradicalization that could contribute to Swedish research and responsible investigativeauthorities. Specific knowledge of individual risk factors for radicalization isremarkably limited, especially compared to what we know about other forms ofviolence.Methods. A total of 1240 cases are included after a data cleaning of the PIRUS-dataset. An exploratory factor analysis examined youths (<21), adults (>22), and a noage-specific group.Results. The younger population tends to have more often been abused as a child,had some traumatic experience, and are currently part of a gang. In comparison, theolder population tend to have alcohol or drug abuse problems and more unstructuredtime, have a radicalized friend and have actively searched for their radicalized group.The All-group shares a variety of variables with the age-specific groups.Conclusion. The results imply a need for specified risk factors according to age. Theage-specific analysis provides a deepened understanding of age-specific risk factorsthat contribute to radicalization and make individuals susceptible to radicalizedgroups. Since different authorities are responsible for minors and adults and alreadywork with a risk factor approach, the findings in this essay imply that the authoritiesshould investigate their current policies and update them to age-specific risk factors ifnecessary.

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The objective behind this study was to mathematically analyse, model and forecast the vital rates (mortality and fertility) of Nepal. In order to attain this goal, the data have been converted into tables and analysed intensively using several softwares such as Mocrosoft Excel, SPSS, Mathematica. The margin of error of data has been analysed. In Chapter 4, the error and uncertainity in the data have been analysed using Bayesian analysis. The reliability of the data of Nepal has been compared with the reliability of the data of Germany. The mortality and fertility conditions of Nepal have been compared from two angles. Data on India (particularly north India) have provided comparison on the socio-economic grounds whereas data on Germany(with accurate and abundant data) have provided comparison on the ground of data availability and accuracy. Thus in addition to analysing and modeling the data, the regional behaviour has been studied. The limited and defective data of Nepal have posed a challange at every stage and phase. Because of this very long term forecasting of mortality could not be made. But the model has provided a lot of information on the mortality for the years for which the data were lacking. But in the comming future, with new data at hand and with the new models developed here, it could be possible to do long term projections. In the less developed world, rural and urban areas have a big impact on the mortality and fertility of a country. The rural and urban effects on mortality and fertility have been studied individually. While analyzing the mortality scene of Nepal, it has been observed that the mortality is decreasing. The decrease is slow, but it reflects the advancement in medical facilities and health awareness. The fertility is also decreasing. There is a decrease in the number of children per woman and per family. This decrease is more pronounced in the urban areas as compared to the rural areas. This also reflects that the family planning programmes launched are showing results, particularly in urban areas.

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The thesis thematically focuses on the prevention of specific learning disabilities in preschool children. The theoretical part of the thesis characterizes the development of a child in preschool age and individual types of specific learning disabilities. Thereafter, the possibilities of screening and diagnostics of individuals at risk of specific learning disabilities and concrete diagnostic and preventive methods used in the Czech environment are presented. The aim of the diploma thesis is to create a program to prevent the emergence of specific learning disabilities, through the selection of activities aimed at the progress of individual areas of development and partial functions, especially those which are found by the research to be the least developed. The basis for the creation of a prevention program consists of data obtained in the diagnosis of the level of partial functions in preschool children and experience gained during targeted work with children at risk of developing SLD. The observation method, analysis of activity results and test method (specifically screening test) were used as research methods. The research took place in the form of action research reflecting pedagogical practice in a selected kindergarten. The output of the work is a preventive program focused on the...

Thesis (MSc)--Stellenbosch University, 2012. / ENGLISH ABSTRACT: See full text / AFRIKAANSE OPSOMMING: Sien volteks