نتایج جستجو برای: control study
تعداد نتایج: 4825609 فیلتر نتایج به سال:
ihd as a modern epidemic of our age is one of the main causes of mortality in iran. this research was done in order to determine the relationship between place of residence and place of occupation (as indicator of air pollution exposures) and other risk factors with ihd. this is a case- control study of ihd involving 191 men aged 45 -70 years. the cases were 91 male patients with myocardial inf...
objective: calpains are a family of ca 2+ dependent proteases. there is some evidence that calpains involved in fusion process that occurs between spermatozoa and the oocyte. the current study aimed to investigate the association of smoking with semen quality and µ-calpain level. materials and methods: this case-control study was conducted on 117 normospermia males between june 2013 and march ...
abstract this study was carried out to compare disinfecting effects of nanosilver with other feed disinfectants on layer hen performance, immune system, gastrointestinal microflora and intestinal morphology. total of 90 layers (lsl) were divided into five groups consisting: 1-control, 2- formalin (200 ppm), 3- formaycin (200 ppm), 4- nanosilver in drinking water (7.5 ppm) and 5-nanosilver in f...
Background and aims: Experience transfer and the knowledge utilization of rapid and timely outbreakcontrol can be the key path-finding to health systems (HSs). The aim of this study was to investigate anEntamoeba histolytica diarrhea outbreak through timely control.Methods: A case-control study and an environmental survey were conducted to identify the sourceof infection...
left-turn lanes; that is, protected left-turn control is recommended if the number of left-turn lanes exceeds 1. Such a decision process lacks a balanced consideration of other factors such as opposing traffic volume, which may be very low; therefore, the decision may not be rational at all locations or under all conditions. In many cases, an alternative left-turn control type might provide equ...
بمنظور بررسی اعتیاد به تریاک بعنوان یکی از عوامل مستعد کننده برای ابتلاء سکته قلبی روش بررسی گذشته نگر (retrospective case-control stydy) در دو بیمارستان سعدی و نمازی که هر دو وابسته بدانشگاه شیراز هستند انجامگرفت . جمعیت مورد مطالعه شامل 200 مورد سکته قلبی و 200 نفر شاهد بود (که شامل 51 زن و 149 مرد در هر گروه بوده است) که بر حسب جنس ، سن (سال +3) و بیمارستان مقایسه (match) شدند. سن، جنس و اعت...
in this study, the effects of oleothermal modification on physical and mechanical peroperties of fir wood (abeis sp.) blocks were examined. at first, some blocks of fir wood with 5 × 20 × 120 cm dimensions were prepared. the blocks were treated in soybean oil. the effects of 3 factors such as treatments temperature (180and 200 °c), holding time (12 and 15 h) and initial moisture content of wood...
In this paper we consider two-groups of i.i.d. normally distributed random variables (N(mu(x),sigma(x) (2)) and N(mu(y),sigma(y) (2))) without assuming equal variance (sigma(x) (2) = sigma(y) (2)). We propose a simple method for constructing confidence bounds based on Howe's approximation I. Its applications in parallel clinical trial (testing H(0) : mu(x)-mu(y)=0 versus H(1) : mu(x)-mu(y)<0) a...
the research questions were as follows: 1. is there any relationship between the students concious awareness of the form and implications of the conjuncations and their improvement in using appropriate conjunctions? 2. does students knowledge of the from and the implications of the conjunctions help them to produce more coherent writings. 3. does a comparison between english conjunctions and th...
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...
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