نتایج جستجو برای: case control study

تعداد نتایج: 5686763  

Journal: :گوارش 0
nasser ebrahimidaryani alireza moayyeri hosein bahrami babak haghpanah atousa nayyer-habibi mohsen sadatsafavi

introduction and aims: we noticed in our practice that the patients with ulcerative colitis (uc) who have developed primary sclerosing cholangitis (psc) experience a milder course of colonic disease. our objective in this study was to define whether there is any difference between uc activity and its course in patients with and without psc. materials and methods: 19 patients with uc and psc (8 ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه اصفهان - دانشکده زبانهای خارجی 1390

this study was conducted to investigate the impact of podcasts as a learning and teaching tool on iranian efl learners’ motivation for listening as well as on their listening comprehension ability. the study also investigated the learners’ perception towards listening to podcasts and examined whether the learners were likely to accept podcasts. out of fifty-five intermediate learners studying e...

A Arabipoor A Bahmanabadi F Ghaffari, F Hosseini

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...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه سمنان - دانشکده علوم تربیتی و روانشناسی 1391

anxiety is one common disorder during childhood. in curing anxiety disorders, there are different types of psychological remedies, pharmotherapy, family therapy, and music therapy that can improve the individual’s anxiety, but we need some other remedies to improve social and emotional relationship and interactions. considering the importance of curing the anxiety disorders, the effect of sand ...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه دریانوردی و علوم دریایی چابهار - دانشکده ادبیات و زبانهای خارجی 1390

abstract cooperative learning refers to small groups of learners working together as a team to solve a problem, complete a task, or accomplish a common goal. in a cooperative environment one’s success is directly related to the success of other members because the focus on the individual shifts towards the group. to test the effectiveness of the method, using jigsaw technique, a study was cond...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه سمنان - دانشکده علوم انسانی 1393

learning-oriented assessment seeks to emphasise that a fundamental purpose of assessment should be to promote learning. it mirrors formative assessment and assessment for learning processes. it can be defined as actions undertaken by teachers and / or students, which provide feedback for the improvement of teaching and learning. it also contrasts with equally important measurement-focused appro...

پایان نامه :دانشگاه آزاد اسلامی - دانشگاه آزاد اسلامی واحد شاهرود - دانشکده فنی 1390

آنالیز لایه های حفاظتی (lopa) یک ابزار تحلیلی قوی است و برای ارزیابی لایه های حفاظتی مناسب استفاده شده جهت کاهش ریسک فرایند می باشد. lopa بر پایه روش های آنالیز مخاطرات فرایند متداول ساخته شده و از مقیاس های نیمه کمی برای ارزیابی فراوانی حوادث بالقوه و احتمال خرابی لایه های حفاظتی بهره می برد. در این پروژه روش lopa مورد مطالعه قرار می گیرد و لایه های حفاظتی تجهیزات واحد شیرین سازی گاز پارس جنوب...

Abdullah Saleh Al-Samawi Haitham Abdulwahab Masood Hassan Abdulwahab Al-Shamahy Ibrahiem Husain El-Nono Mogahid Yahi'a Nassar Nagieb Waza'a Abu Asba

Background: Human leukocyte antigens (HLAs) are found to be significant genetic factors concerning the susceptibility of an individual to certain diseases. Objective: To determine the association between variants of class I (A and B) and class II (DRB1) HLA alleles and chronic renal failure (CRF), compared with healthy controls, in Yemen. Methods: A case-control study in the Urology and Nephrol...

Journal: :journal of biostatistics and epidemiology 0
seyedsaeed hashemi-nazari safety promotion and injury prevention research center and department of epidemiology, school of public health, shahid beheshti university of medical sciences, tehran, iran mohammadali mansournia department of epidemiology and biostatistics, school of public health, tehran university of medical sciences, tehran, iran

background  & aim: case-crossover  studies are the case-control  version of crossover studies. in these studies, cases and controls are the same subjects. the term crossover is applied for designs that all subjects pass through both treatment (exposure) and placebo (non-exposure) phases. in fact they are  crossover  of  subjects  between  periods  of  exposure  and  non-exposure.  this  design ...

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