نتایج جستجو برای: nested case
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Background & Objectives: This investigation was prompted by the growing importance of nested case-control studies and the increasing frequency with which they are done in epidemiologic research. After a brief explanation of nested case-control studies, we evaluate the trends in research methodology over the last decade, especially with regard to cohort, case-control, and nested case-control des...
Background and objective: The nested case-control study has become popular as an efficient alternative to the full-cohort design. This study compares the results of a nested case-control analysis approach with the full cohort analysis. Methods: A cohort of 276 subjects (new cases from a TB registry) was used for this study. Cox Regression model was used for the full cohort analysis. In orde...
background: due to complex causal framework of neonatal mortality, improvement of this health indicator is quite gradual and it's decreasing trend is not as great as other health indicators such as infant and under 5 mortality rates.this study was conducted to evaluate neonatal mortality risk factors based on nested case-control design. methods: the study population was 6900 neonates who were ...
objective: although numerous studies have found higher rates of abortion and still births following consanguinity (familial marriages), the question of whether consanguinity significantly increases the risk of neonatal death has inadequately been addressed.this study aims to evaluate familial marriage effects on neonatal death in rural areas in iran. materials and methods: i n this nested case-...
Case-Cohort and nested case-control designs are the most well-known and cost-effective derivatives of prospective studies. Due to the popularity of these designs in recent years, the aim of this study is to provide a comprehensive and up-to-date description of them with respect to methodological issues such as sampling scheme, effect measure estimation, and analysis strategies. Overall, random ...
Introduction: Examination of Geimsa stained blood smears is the main method of malaria diagnosis in our country, however, accuracy of results is largely depended on the skill and laboratory conditions. This study was designed and carried out to assess the current situation and to determine the effectiveness and quality improvement of malaria diagnosis program. Methods: In this analytical s...
Introduction: Congenital toxoplasmosis is caused by acute toxoplasma gondii infection of mother during pregnancy, which may lead to such serious complications as stillbirth, ophthalmologic and neurologic disorders. The aim of this study was to determine the incidence of toxoplasmosis in pregnant women and their neonates, and disease complications. Methods: In this prospective cohort study, blo...
Case-cohort and nested case-control designs are often used to select an appropriate subsample of individuals from prospective cohort studies. Despite the great attention that has been given to the calculation of association estimators, no formal methods have been described for estimating risk prediction measures from these 2 sampling designs. Using real data from the Swedish Twin Registry (2004...
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