نتایج جستجو برای: non linear multivariable regression analysis
تعداد نتایج: 4245067 فیلتر نتایج به سال:
the acute ecotoxicity of a set of mixture samples (washing powders, wastes, fuel extracts etc.) was assessed using four acute ecotoxicity assays with aquatic organisms (daphnia magna, poecilia reticulata, artemia salina and desmodesmus subspicatus). the experimental concentration-response curves were fitted by seven two-parameter sigmoid equations using non-linear regression. the regression per...
PURPOSE To review the principles of multivariable analysis and to examine the application of multivariable statistical methods in general medical literature. DATA SOURCES A computer-assisted search of articles in The Lancet and The New England Journal of Medicine identified 451 publications containing multivariable methods from 1985 through 1989. A random sample of 60 articles that used the t...
BACKGROUND With one quarter of the world population infected, the intestinal nematode Ascaris lumbricoides is one of the most common infectious agents, especially in the tropics and sub-tropics. Infection is caused by oral intake of eggs and can cause respiratory and gastrointestinal problems. To identify high risk areas for intervention, it is necessary to understand the effects of climatic, e...
Background and Objective: For nearly a century, it has been suspected that reproductive tract infections play an etiologic role in uterine leiomyoma. However, no epidemiologic study of leiomyoma has used the polymerase chain reaction (PCR) to compare uterine tissues from cases and non-cases, and to investigate associations between uterine leiomyoma and infections detected by PC...
Background: The ”July effect” is a colloquialism asserting an increased rate of errors at the start of the academicyear in teaching hospitals. This retrospective population-based study evaluated for the presence of the July effect inperforming shoulder arthroplasty.Methods: Using the Nationwide Inpatient Sample for 2002 through 2011, a total of 178,590 patients undergoingshoulder arthroplasty a...
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