نتایج جستجو برای: positive predictive value
تعداد نتایج: 1418773 فیلتر نتایج به سال:
As I read the study by Bakhtiari et al. (1), I noticed that they miscalculated the positive predictive value. They indicated that the positive predictive value of the PCR assay was 100%. But when I placed the values on the table and calculated the positive predictive value of the PCR assay, I found it 83.3%.
Computing the positive predictive value (PPV) of a wellknown test for a relatively common disease is a straight-forward exercise. However, in the case of a new test for a rare disorder; the extreme numbers involved-the very low prevalence of the disorder and the lack of previous false-positive results--make it difficult to compute the PPV. As new genetic tests become available in the next decad...
Introduction: Bleeding disorders are a common problem in daily practice, especially in premenopausal women. In our investigation, we compared the sensitivity and specificity of three different diagnostic methods Trans-vaginal sonography(TVS), saline infusion sonohystrography(SIS) and Hysteroscopy. Methods: It was a cross- sectional study with a study population of ninety-nine women suffering ...
ABSTRACT Health screening in student, such as Visual screening test usually carry out by school nurses in many rural schools in Iran. While students are in the growth age, visual acuity may be affected by growth. A Study was carried out to evaluate vision screening test on students in Hamadan, Iran. A sample of 878 pupils examined by a school nurse using E- Chart. According to the test, chil...
Background: Researchers and health specialists are increasingly obtaining information on chronic illnesses from self-reports. This study validates self-reports of hypertension, based on a recently fielded survey in Mashhad City, Iran. Methods: In this cross-sectional study, we used the results of 2015 census in Mashhad City, a population based survey of people over the age of 30 (n=300745) to ...
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