نتایج جستجو برای: matched case control studies
تعداد نتایج: 3744722 فیلتر نتایج به سال:
several demographic factors may be considered as barriers to osteoporosis prevention like high rate of illiteracy and low socioeconomic status in developing countries, there is lack of studies that assess the relationship between socioeconomic status and osteoporosis. this study was a case-control study and it was conducted in two bone mineral density centers in tehran. case group includes 163 ...
cohesion is an indispensable linguistic feature in discourse analysis. lexicald such a differe cohesion and conjunction in particular as two crucial elements to textual cohesion and comprehension has been the focus of a wide range of studies up to now. yet the relationship between the open register and cohesive devices has not been thoroughly investigated in discourse studies. this study concen...
Background The aim of this study was to evaluate the anxiety and depression in women with infertility. MaterialsAndMethods A case control study was carried out on 150 subjects with infertility and on 150 subjects with tubal ligation. The two groups were matched in demographic and personal characteristics. Data collection tool was a questionnaire including questions regarding demographic and obs...
We use causal diagrams to illustrate the consequences of matching and the appropriate handling of matched variables in cohort and case-control studies. The matching process generally forces certain variables to be independent despite their being connected in the causal diagram, a phenomenon known as unfaithfulness. We show how causal diagrams can be used to visualize many previous results about...
background : myocardial infarction in young age is increasing. identifying risk factors could be important for health promotion. we studied classic atherosclerotic risk factors in premature myocardial infarction. methods : in this matched case-control study, which was conducted from 2005 to 2007 in birjand county, the east of iran, atherosclerotic risk factors ( hypertension , family history of...
conclusions levothyroxine absorption testing over 2 hours may offer a more rapid alternative to the commonly used longer protocols to rule out malabsorption. scheduling a levothyroxine absorption test may induce some patients to start adhering to levothyroxine therapy. patients and methods serum levels of thyroid stimulating hormone (tsh), ft4, and free triiodothyronine (ft3) were drawn at 0, 6...
Background and Aim: Along with the development of cardiac diagnostic procedures, new risk factors ,such as homocysteine role in cardiovascular disease, have been proposed. The aim of the present study was to evaluate the levels of homocysteine and total antioxidant capacity in patients with acute myocardial infarction compared with the control group. Materials and Methods: A case-control stu...
Background The aim of this study was to compare sexual function between women of infertile couples and women who have undergone TL. MaterialsAndMethods In this case control study in Royan Institute and in a health center in Gilan province (Iran), between 2013 and 2014. There were 150 infertile women (cases) and 150 women undergoing TL (controls). A questionnaire was completed for each patient. ...
OBJECTIVES Research on how the risk of gastric cancer increases with Epstein-Barr virus (EBV) infection is lacking. In a systematic review that investigated studies published until September 2014, the authors did not calculate the summary odds ratio (SOR) due to heterogeneity across studies. Therefore, we include here additional studies published until October 2015 and conduct a meta-analysis w...
conclusions the prevalence of both fv and fii variants are population based. iran is an ethnically diverse country. therefore, for a comprehensive analysis of a potential association of fv and/or fii mutations with stroke among iranian population, epidemiological studies could be conducted among different ethnic groups. patients and methods the study population consisted of 153 patients of diff...
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