نتایج جستجو برای: case control studies
تعداد نتایج: 3684408 فیلتر نتایج به سال:
Background & Objectives: This investigation was prompted by the growing importance of nested case-control studies and the increasing frequency with which they are done in epidemiologic research. After a brief explanation of nested case-control studies, we evaluate the trends in research methodology over the last decade, especially with regard to cohort, case-control, and nested case-control des...
background: tuberculosis (tb) is still a major cause of morbidity and mortality in both developed and developing countries. delay in accessing tuberculosis care is associated with the highest densities of mycobacterium tuberculosis (m. tuberculosis) bacilli on sputum smears. objectives: the current study aimed to determine the extent of delay, and the major health system contributing factors to...
background and objectives: multiple sclerosis (ms) is the most prevalent autoimmune disease of the central nervous system, and it has been suggested that nutrition might play a role in the etiology of ms. this study was aimed to evaluate the relationship between ms risk and intake of some macro- and micro-nutrients in tehran (iran). materials and methods: in this hospital based, case-control st...
background: lung cancer is considered as one of the most frequent cancers worldwide, and has been the cause of more than onemillion mortalities each year. exposure to tobacco smoke is the primary cause of most lung cancers, since it contains several thousandcompounds, including more than 50 known carcinogens. however, a small fraction of individuals who are exposed to tobacco smokedevelop lung ...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید