نتایج جستجو برای: control study
تعداد نتایج: 4825609 فیلتر نتایج به سال:
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 ...
Background: Acne vulgaris has a multifactorial pathogenesis; however, the exact role of genetic predisposition is not clear. Some studies have reported an association between familiy historyof acne and moderate to severe acne. In this study, we investigated the relationship between familiy history and prevalence of acne vulgaris in girls 8 to 13 years of age.Methods: This case-control study enr...
stability study of biological products plays an important role for determination of product changes in maintenance period and ensuring of safety and efficacy of vaccines. in this research, accelerated and long-term stability study performed for six batches of full and reduced-dose cattle iriba strain brucellosis vaccine that manufactured by razi vaccine and serum research institute as a new vac...
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 geopolitics of afghanistan after september 11, 2001, and its impact on iranian national security
abstract u.s. attack to afghanistan after 9/11 provided opportunities for us who tried to become the dominant power after collapse of ussr and bipolar world. thinkers like fukuyama believed american liberal democrats thought would be universally accepted without resistances. liberal democracy is the best and final model of governance; in this regard, united state has moral responsibilities for...
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...
stability studies play a critical role in assuring product quality at all points in the vaccine life cycle and havea major impact on the success of immunization programs worldwide. the purpose of stability study isdetermination of the vaccine quality under the variety of environmental factors and to establish a re-testperiod or a shelf life and recommended storage conditions. in this study thre...
Background: Lung cancer is considered as one of the most frequent cancers worldwide, and has been the cause of more than one <span style="font-variant...
abstract tasks nowadays are at the center of attention in sla research. task types is one of the critical issues in this regard, their effectiveness and suitability to any particular context, their characteristics and the result they yield are among some of these issues. on the other hand, discourse markers (dms) have been very much investigated and their effectiveness in conveying the meaning...
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