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...

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...