نتایج جستجو برای: case control studies
تعداد نتایج: 3684408 فیلتر نتایج به سال:
vocabulary as a major component of language learning has been the object of numerous studies each of which has its own contribution to the field. finding the best way of learning the words deeply and extensively is the common objective of most of those studies. however, one effective way for achieving this goal is somehow neglected in the field. using a variety of activities such as games can r...
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...
Noise is one of the main parameters to be considered to achieve a healthy indoor ambience in ferries. Therefore, the noise standards need to be more specialized and specifically based on real sampled data and case studies. In the present research, the noise levels in a ship, under different working conditions, were sampled and compared with those specified in the new and old standards. An initi...
Background Children are more likely to be burned than other age. The aim of this study was to determine the burn-related factors in children in Kermanshah province, Iran. Materials and Methods In the present hospital based case-control study, 198 under 15 years age children who were burned ( from beginning of spring 2016 until the end of spring 2017), enrolled into the study as cases and 19...
Noise is one of the main parameters to be considered to achieve a healthy indoor ambience in ferries. Therefore, the noise standards need to be more specialized and specifically based on real sampled data and case studies. In the present research, the noise levels in a ship, under different working conditions, were sampled and compared with those specified in the new and old standards. An initi...
abstract the first purpose of this study was to investigate the effect of consciousness-raising (c-r) activities on learning grammatical structures (simple present tense in this case) by iranian guidance school efl learners. the second one was to investigate the effect of gender on learning the simple present tense through c-r activities and tasks. finally, this study aimed to investigate the ...
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 ...
It is well known that the presence of untractable normalizing constants in a probability density function complicates the calculation of maximum likelihood estimators. Usually numerical or Monte Carlo methods are employed in order to obtain an approximation. We propose a new statistical method for carrying out the calculations regarding maximum likelihood estimation by avoiding calculation of t...
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