نتایج جستجو برای: matched case control studies
تعداد نتایج: 3744722 فیلتر نتایج به سال:
Background Endometriosis is defined as overgrowth of endometrial tissue outside the uterine cavity. Diet may play a role in the aetiology of endometriosis through effects on oxidative stress, prostaglandin metabolism, and steroid hormone levels. The objective of this paper is to assess the role of diet on risk of endometriosis among infertile Iranian women. MaterialsAndMethods In this case cont...
Background The effect of hysteroscopic polpectomy for endometrial polyps during treatment cycles is still debated and further studies are necessary to evaluate beneficial effect of this procedure. MaterialsAndMethods This matched case-control study compared retrospectively 86 women with and without hysteroscopic polypectomy who underwent in vitro fertilization and / or Intracytoplasmic sperm in...
Background and Aim: Case-Control studies provide evidence in the area of health. Validity and accuracy of such studies depend to a large extent on the similarity (similar distributions) of the case and control groups according to confounding variables. Matching is a method for controlling or eliminating the effects of important confounders. Matching using propensity score has recently been intr...
Introduction: Exposure to systemic corticosteroids is known to be associated with a risk of cataract. This study was undertaken to determine the risk of cataract associated with the use of inhaled corticosteroids in old age. Methods: A case-control study consisting of 160 people with cataract (case) and 160 controls matched for age and sex was conducted at Shaheed Sadoughi and Shaheed Rahnemoo...
BACKGROUND Coffee is implicated in the susceptibility to several cancers. However, the association between coffee and lymphoma remains unclear. This meta-analysis aimed to assess quantitatively the association between coffee and the incidence of lymphoma. METHODS A literature search was performed for cohort and case-control studies published using PubMed, Cochrane, and EMBASE databases. Studi...
building on previous studies on the effectiveness of different types of written corrective feedback, the present study aimed at investigating whether direct focused corrective feedback and direct unfocused corrective feedback produced any differential effects on the accurate use of english articles by efl learners across two different proficiency levels (low and high). in current study, the par...
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