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 ...

Background and purpose: Peripheral leukocytosis is a marker of inflammatory response in the early phase of acoute myocardial infarction(ÂMÏ). Role of peripheral leukocytosis and relative neutrophilia as a risk factor for early development of left ventricular systolic dysfunction (LVSD) is not established. Ôbjective of this study was to examine the relation between peripheral leukocyte differe...

Background and Objectives: Since there is inconsistency reports in relationship between shift work (SW) and blood pressure (BP), therefore we aimed to show any association between SW and BP by using of Bayesian Multilevel Modeling, which is a reliable method for this type of analysis. Methods: The profiles of 4145 workers in Polydactyl Iran Corporation were examined in historical cohort between...

مقدمه: این مطالعه به منظور بررسی ارتباط بین سطح سرمی لیپید مادر با وزن هنگام تولد نوزاد در بیمارستان جواهری طی سالهای 89-88 انجام شده است. روش مطالعه: این مطالعه به صورت یک بررسی مشاهده ای (observational) از نوع کوهورت (cohort) آینده نگر (prospective) انجام گردیده است. جامعه مورد بررسی شامل 210 نفر از مادران و نوزادان یا زایمان تک قلو بود که آنها را با استفاده از روش نمونه گیری در دسترس (conve...