نتایج جستجو برای: case control study
تعداد نتایج: 5686763 فیلتر نتایج به سال:
چکیده ندارد.
south asian countries have a high prevalence of coronary heart disease (cad) in line with their economic development. in these countries, we find nearly one quarter of the total world population in the process of nutritional transition, from poverty to affluence due to rapid economic development. india; in particular, with a population of over one billion has a high burden of cad. to evaluate t...
background: nowadays, chlamydia trachomatis is known as a causative agent of infertility. because of, asymptomatic nature of infection, many may suffer from its lasting complications such as infertility. this study was performed in tehran during april 2007 to april 2008 to compare the prevalence of chlamydia trachomatis infection in fertile and infertile women using elisa and pcr methods. metho...
background: a case-control study was carried out to investigate the roles of prior allergies and family history of cancers and their interaction in the etiology of adult leukemia. methods: prior allergies status and family history of cancers in first-degree relatives were compared between 131 incident leukemia cases and 206 hospital-based controls. odds ratios (or) were estimated using an uncon...
a significant problem in multicarrier communication systems is the necessity to reduce the value of papr (peak-to-average power ratio) of transmitting signal. in this thesis we study the effect of the system parameters such as coding and modulation types on papr and ultimate ber in a mc-cdma system. in this study we consider fading channel as well as the nonlinearity of transmitter’s amplifier ...
چکیده ندارد.
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...
there is no doubt that human being needs to become integrated with industry and industry needs to be progressed, daily. on the other hand, serious events in industrial units specially in oil industries has been shown that such damages and events are industry related ones. the consequence of such events and damages which resulted in chemical and poisoned explosions and loss of life and property ...
abstract the following study, in the first place, attempted to examine the effect of less experienced teachers participation in experienced teachers classes on their own skills and teaching methodology, in the second place, attempted to find out the role of teachers training in students achievements. for this purpose, 21 efl teachers were selected according to available sampling in kish l...
abstract the present study tried to investigate the effect of visual aids (films) on the development of the speech act of disagreement among iranian efl intermediate learners. to this end, the researcher selected 40 homogeneous intermediate learners based on their scores on oxford placement test. .the subjects then divided into control group and experimental group. both classes were tested by ...
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