منابع مشابه
Cohort studies: prospective versus retrospective.
Cohort studies form a suitable study design to assess associations between multiple exposures on the one hand and multiple outcomes on the other hand. They are especially appropriate to study rare exposures or exposures for which randomization is not possible for practical or ethical reasons. Prospective and retrospective cohort studies have higher accuracy and higher efficiency as their respec...
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Background: Improvement of assisted reproductive technique (ART) results in higher pregnancy rates from positive Beta HCG to take home baby statistics. Despite developments in culture media allowing blastocyst stage transfer, some centers apply second, third and sometimes fourth day post injection for embryo transfer. This study aimed to compare their reproductive outcomes. Methods : This p...
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Background: Metabolic syndromes have been identified as a major risk factor for people with cardiovascular disease. Metabolic syndromes are defined as a range of conditions including waist-fat, abdominal obesity, high blood pressure, diabetes, high triglycerides, and HDL. Considering the importance of controlling metabolic syndrome, the research study subject with the mentioned aim is so import...
متن کاملDoes ethnicity affect survival following colorectal cancer? A prospective, cohort study using Iranian cancer registry
Background:The present study compared the differences between survivals of patients with colorectal cancer according to their ethnicity adjusted for other predictors of survival. Methods: In this prospective cohort study patients were followed up from definite diagnosis of colorectal cancer to death. Totally, 2431 person-year follow-ups were undertaken for 1127 colorectal cancer patients on...
متن کاملEffect of Adenotonsillectomy on Serum Levels of Total Antioxidant-A Prospective Cohort Study
Introduction: Antioxidants are essential elements in reducing the harmful effects of free radicals. The aim of this study was to compare the serum levels of total antioxidant before and after adenotonsillectomy procedure. Materials and Methods: This study was conducted on 41 children with the age range 3-12 who underwent adenotonsillectomy. The total l...
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ژورنال
عنوان ژورنال: European Journal of Vascular and Endovascular Surgery
سال: 2016
ISSN: 1078-5884
DOI: 10.1016/j.ejvs.2015.09.021