نتایج جستجو برای: interquartile range
تعداد نتایج: 668068 فیلتر نتایج به سال:
The aim of this study was to assess job satisfaction levels among health-care workers and factors correlated with their overall job satisfaction. This cross-sectional study was conducted from July to September 2011 with 164 health-care workers using self-administered questionnaires on a six-point Likert scale. Categorical variables were reported using frequencies and median (interquartile range...
UNLABELLED BACKGROUND Patient reported menstrual history, physician clinical evaluation, and ultrasonography are used to determine gestational age in the pregnant female. Previous studies have shown that pregnancy dating by last menstrual period (LMP) and physical examination findings can be inaccurate. An ultrasound performed in the radiology department is considered the standard for determ...
In this paper we propose a test statistic to discriminate between models with nite variance and models with in nite variance. The test statistic is the ratio of the sample standard deviation and the sample interquartile range. Both asymptotic and nite sample properties of the test statistic are discussed. We show that the test has good power properties against in nite-variance distributions and...
BACKGROUND Although several studies have reported that C-reactive protein (CRP) is associated with physical performance, few studies have evaluated the relationships between CRP and physical performance among subjects who had a very low range of CRP. Therefore, it is still unclear whether a lower CRP is favorably associated with physical performance even within a very low range. OBJECTIVE The...
OBJECTIVES The purpose of this study was to quantitatively examine the association of patient- and trial-specific factors with participation in cardiovascular randomized clinical trials. BACKGROUND Randomized clinical trials are central to evidenced-based medicine, but low patient participation rates and potentially modifiable barriers are not well understood. METHODS At a large U.S. academ...
OBJECTIVES To assess the accuracy with which workers report their exposure to occupational sources of hand transmitted (HTV) and whole body vibration (WBV). METHODS 179 Workers from various jobs involving exposure to HTV or WBV completed a self administered questionnaire about sources of occupational exposure to vibration in the past week. They were then observed at work over 1 hour, after wh...
Until now, mortality and spreading mechanisms of influenza pandemics have been studied only for the 1918, 1957, and 1968 pandemics; none have concerned the 19th century. Herein, we examined the 1889 "Russian" pandemic. Clinical attack rates were retrieved for 408 geographic entities in 14 European countries and in the United States. Case fatality ratios were estimated from datasets in the Frenc...
From January 2003 to December 2005, 5091 susceptibility test results from invasive isolates of Escherichia coli, collected from blood cultures and cerebrospinal fluid routinely processed within 58 participating laboratories, were investigated. These laboratories in turn serviced 64 hospitals in Algeria, Cyprus, Egypt, Jordan, Lebanon, Malta, Morocco, Tunisia and Turkey. The median proportion of...
BACKGROUND Some young women experience delays in diagnosis of cervical cancer, but little research about ways of studying these delays has been published. A major challenge is that gynaecological symptoms are common in young women, but cervical cancer is rare. This study describes the development and testing of a measure for studying delays in diagnosis in young women with cervical cancer. ME...
BACKGROUND The aim of the study was to assess whether medical students' fainting outside the university or while witnessing surgical procedures and/or autopsies influenced their choice of a specialization. MATERIALS AND METHODS The study group consisted of 605 medical students (from fourth to sixth year of study) from five medical universities in Poland (325 women, 212 men and 8 responders of...
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