نتایج جستجو برای: case control study
تعداد نتایج: 5686763 فیلتر نتایج به سال:
background: coffee is implicated in the susceptibility to several cancers. however, the association between coffee and lymphoma remains unclear. this meta-analysis aimed to assess quantitatively the association between coffee and the incidence of lymphoma. methods: a literature search was performed for cohort and case-control studies published using pubmed, cochrane, and embase databases. studi...
ارائه راهکارهایی مناسب جهت تشخیص دقیق تر و بهتر گلوکوم مادرزادی و جلوگیری از پیشرفت آن. روش مطالعه: 50 کودک مبتلا به گلوکوم مادرزادی (گروه case) و 50کودک سالم (گروه control) در این مطالعه مورد بررسی قرار گرفتند. هر دو گروه مورد معاینه قرار گرفتند وتست پتانسیل برانگیخته از بینایی((vep روی آنها انجام شد. متغیرهای اندازه گیری شده شامل تاخیر فاز(latency) ودامنه(amplitude) بودند.نتایج ثبت و فراوا...
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...
background: to determine the risk factor for acute diarrhea disease in children. methods: in the survey, 220 cases and 220 controls were involved. cases were children with loose watery feces, pathologically diagnosed as acute diarrhea by the physician, and enrolled from the emergency ward as the incident cases in dr. sheykh hospital, mashhad, northeast of iran. control group too, was enrolled f...
the evaluation of matching in a case-control study of colorectal cancer using general practice lists
background: a crucial part of a case-control study is the selection of a sample of controls that represent the base-population from which cases were drawn. controls may be matched to cases by one or more potentially important confounding variables, such as socioeconomic status. in the united kingdom, one method for control selection has been based on the patient list of the general practice ...
adverse lifestyle changes like rapid change in dietary habits coupled with decreased physical activity and increasing rates of alcohol and tobacco consumption can increase coronary artery disease risk factors and its mortality even higher than the rates predicted. to evaluate the role of adverse lifestyle changes factors in the causation of cad, a hospital based case-control study was conducted...
the present study sought to investigate the impact of using mind-mapping technique instruction on female elementary efl learners reading comprehension; it also investigated their attitudes towards using mind-mapping technique as a tool to improve their reading comprehension. this study followed a quasi-experimental design with two intact groups as experimental, and control groups. the participa...
the ability to speak two languages in the world is a remarkable achievement. there is a good reason to believe that bilingualism is the norm for the majority of people in the world because 70% of the earth’s population are supposed to be bilingual or multilingual. various investigations have shown that the native language impacts foreign word recognition, and this influence is adapted by the de...
introduction: diabetes mellitus (dm) is one of the most common chronic diseases in the world and the most challenging health problems of the twenty first century. this disease is common in yazd and has a high prevalence in the province. due to not available analytic study, the aim of this study was to determine the risk factors of type 2 diabetes among the adult yazd population, iran. materials...
abstractintroduction: the role of breast-feeding in protection against childhood acute leukemia is uncertain. in this study, we tested the hypothesis that breast-feeding decreases the risk of 300 patients we investigated childhood acute leukemia. materials and methods: in a case control study, we inrestigated 300 patients, aged 2±13 years, with acute leukemia, as well as 300 controls, individua...
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