Background. Acute pyelonephritis is a potentially severe disease for which there are few population-based studies.
急性肾盂肾炎是较少几项以人口基础研究的潜在严重性疾病之一。
In particular, a significant positive association was present in population-based studies, which had lower response rates in cases and controls, but not in hospital-based studies.
特别是在以人群为基础的研究中有显著正相关性，在病例和对照中相关性较低，但在住院病人研究中这种相关性较高。
BACKGROUND. To the authors' knowledge, few population-based studies to date have considered the serial use of colorectal cancer screening tests, which are usually recommended at specific intervals.
据作者所知，现在很少有以人群为基础的关于结直肠癌扫描试验连续应用的研究，而在特殊的时期，这个是被推荐的。
Population-based surveillance studies using laboratory-confirmed cases were sought for each incidence group by a computerized search of the scientific literature.
检索相关科学文献，为每个发病率组检索出基于人群监测研究并采用实验室检查确诊的病例数据。
Most studies could not quantify disease frequency in the general population as they are hospital-based and confounded by variations in threshold and the rate of hospitalization.
多数研究不能把一般人群当中的发病频率给予定量是因为它们是基于医院的并且被混杂在住院率的变化之中。
This paper studies the urban population growth style in about 40 cities of Jiangsu province, based on the regression and Lorenz curves.
本文以江苏省40个城市为研究对象，通过回归分析方法、绘制人口洛伦兹曲线实证研究了江苏省城市人口增长的方式。
"We continue to support studies to provide clarity on the use of our drug in this population, " she adds. "But it is really hard to reach a conclusion based on the small sample sizes in this study.
“我们会继续向研究活动提供支持以澄清我们的药物用于这个群体的后果，”她补充道，“但是想通过这样一个小样本量的研究获得确切结论确实比较困难。”
Large population-based NGS studies have demonstrated that the majority of individuals carry presumed pathogenic variants.
大规模人群为基础ngs研究表明，大部分人携带推测致病变种。
The report was released Tuesday by the Population Council, an international organization based in New York that studies issues related to child bearing.
这份报告是本星期二由人口委员会公布的。人口委员会是一家研究儿童养育问题的国际组织，总部设在纽约。
Previous studies have estimated that wake-up strokes comprise 8%to 28% of all ischemic strokes, but these studies were either small or not population-based.
先前的研究估计醒后脑卒中占所有缺血性脑卒中的8%至28%，但这些研究要不样本规模小，要不就是非人群学研究。
Previous studies have estimated that wake-up strokes comprise 8%to 28% of all ischemic strokes, but these studies were either small or not population-based.
先前的研究估计醒后脑卒中占所有缺血性脑卒中的8%至28%，但这些研究要不样本规模小，要不就是非人群学研究。
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