نتایج جستجو برای: case control
تعداد نتایج: 2543674 فیلتر نتایج به سال:
Version control systems are critical for coordinating work in large software engineering teams. Recently, distributed version control (DVC) systems have become popular, as they have many advantages over their centralized (CVC) counterparts. DVC allows for more frequent commits, and simplifies branching and merging. These features encourage developers to make smaller, finergrained commits that d...
background: the traditional methods of studying the gene-environment interactions need a control group. however, the selection of an appropriate control group has been associated with problems. therefore, new methods, such as case-only design, have been created to study such interactions. the objective of this study was to compare the case-only and case-control designs using data from patients ...
Background Endometriosis is defined as overgrowth of endometrial tissue outside the uterine cavity. Diet may play a role in the aetiology of endometriosis through effects on oxidative stress, prostaglandin metabolism, and steroid hormone levels. The objective of this paper is to assess the role of diet on risk of endometriosis among infertile Iranian women. MaterialsAndMethods In this case cont...
Background The effect of hysteroscopic polpectomy for endometrial polyps during treatment cycles is still debated and further studies are necessary to evaluate beneficial effect of this procedure. MaterialsAndMethods This matched case-control study compared retrospectively 86 women with and without hysteroscopic polypectomy who underwent in vitro fertilization and / or Intracytoplasmic sperm in...
this study investigated the effect of prior knowledge on the listening comprehension performance of fl learners. twenty students, male and female, drawn from the two intact groups of the senior and junior english language and literature majors were chosen as the participants of this study . the two groups were then randomly assigned into the experimental and control group. the experimental gr...
چکیده این پایان نامه به بررسی اثر سیم پیچ مغناطیسی و کاوه یِ خوشه گر با بسامد رادیویی بر هاله و بیرونگراییِ باریکه هایِ پیوسته و خوشه ایِ ذرات باردار در شتابدهنده های خطیِ یونی، پروتونی با جریان بالا می پردازد و راه حل هایی برای بهینه نگهداشتن این کمیتها ارایه می دهد. بیرونگرایی یکی از کمیتهای اساسی باریکه هایِ ذرات باردار در شتابدهنده ها است که تاثیر قابل توجهی بر قیمت، هزینه و کاراییِ هر شتابدهند...
in this thesis, we consider a mathematical model of cancer with completely unknown parameters. we study the stability of critical points which are biologically admissible. then we consider a control on the system and introduce situations at which solutions are attracted to critical points and so the cancer disease has auto healing. the lyapunov stability method is used for estimating the un...
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...
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