نتایج جستجو برای: case control studies
تعداد نتایج: 3684408 فیلتر نتایج به سال:
current studies in second language (l2) learning have revealed the positive role of corrective feedback (cf) in both oral and written forms in different language features. the present study was an attempt to investigate the effect of both direct and indirect written corrective feedback (wcf) on the use of grammatical collocations in l2 writing. the study also sought to examine whether the effec...
abstract purpose of this paper: this paper presents an analysis toward understanding the business value components that a health care organization can drive by adopting rfid technology into its system. this researcher proposes a framework for evaluating the business value of rfid technology. to do so, emphasis is put on delivering business value through refining business processes and expanding...
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...
â background: the relationship between subfertiltiy and celiac disease has been well described and may be the only presenting feature of celiac disease. therefore, this study was designed to show the prevalence of celiac disease in unexplained infertility among iranian patients in tehran, iran. â methods: this case-control study includes 125 patients with primary unexplained infertility and 1...
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...
To address concerns regarding the representativeness of controls in case-control studies, two selection strategies were evaluated in a study of childhood leukemia, which commenced in California in 1995. The authors selected two controls per case: one from among children identified by using computerized birth records and located successfully, the other from a roster of friends; both were matched...
Multiple control groups in case-control studies are used to control for different sources of confounding. For example, cases can be contrasted with matched controls to adjust for multiple genetic or unknown lifestyle factors and simultaneously contrasted with an unmatched population-based control group. Inclusion of different control groups for a single exposure analysis yields several estimate...
While preparing for this day, I have pondered, how can medical statistics help improve the state of medical care? The potential for better medical care is dependent on the scientific temper of our medical profession. The question is how can we improve the scientific temper? The search for evidence is fundamental to the practice of modern day medicine. There is now a movement towards evidence ba...
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