The main approach to solve this problem is to stratify the population studied through taking the confounder as the stratifying variable.
解决这一问题的主要方法是将混杂因子作为分层变量把被研究群体分层。
The Pediatric Outcomes Data Collection Instrument and the Gross Motor Function Measure were not sensitive to brace treatment in the population studied.
儿科成果数据采集仪器和大体运动功能测试量表在戴支架群体研究敏感性不高。
Two study limitations include the use of self-reported food recall surveys and the fact that receptor data were only available for 65.4% of the population studied.
此项研究存在两个局限，包括受试者自身报告的食物摄入回忆调查准确性的保证及受体资料在调查人群中的不完全性(其中只有65.4%的人资料完备)。
However, given the small sample size and limited nature of the population studied, naturally these results should be taken with a grain of salt until replicated by other researchers.
但因研究对象范围小以及研究对象的局限性，在有其他研究者进行此研究前，对此研究结果应持谨慎态度。
For many years I have studied global agricultural, population, environmental and economic trends and their interactions.
多年来，我一直在研究全球农业、人口、环境和经济趋势及其相互作用。
It is difficult to figure out a global population of polar bears as much of the range has been poorly studied.
由于大部分有关其生活范围的研究还很少，所以很难统计出全球北极能的数量。
The population and community characteristics in the Platycladus orientalis forest on Qianfo Mountain in Jinan are studied.
研究了济南千佛山侧柏林的种群和群落特征。
Because Kaufman studied some writers who lived hundreds of years ago, it is impossible to compare their average age of death to that of the general population.
由于考夫曼研究的一些作家生活在数百年前，因此无法拿他们的平均死亡年龄与全体人口来作比较。
Three of the cases they studied found that the rise of West Nile virus in the U.S. corresponded to decreases in bird population density.
他们在研究过的三个案例中发现西尼罗河热在美国的的流行与鸟类种群密度的下降相关。
In the studied communities in the world, close to half the population is moving up or down the socioeconomic ladder, often with the same people rising and then falling at different times.
在世界上经研究的社区中，几乎有一半的人口正在社会经济的阶梯上向上或向下移动，往往是同样的人在不同的时间内上行而后又下跌。
This trial does not provide evidence to support the use of aspirin or antioxidants in primary prevention of cardiovascular events and mortality in the population with diabetes studied.
这次测试并没有提供证据支持使用阿司匹林或抗氧化剂作为初级预防糖尿病心血管事件和死亡率的人口研究。
Among 32 countries Straus studied, in those where spanking was accepted, the average IQ of the survey population was lower than in nations where spanking was rare, the researcher says.
在施特劳斯所研究的32个国家当中，在体罚可以被接受的国家，接受调查人口的平均智商要比体罚罕见的国家的要低，研究者如是说。
The olms studied by Voituron’s team are part of a population established 48 years ago to help conserve the rare amphibian, which is found in caves in Croatia and Slovenia.
48年前为了保护稀有的两栖物种，洞螈作为其中一种被人们保护了起来，当时是在克罗地亚和斯洛文尼亚的山洞里面找到了它们，这些洞螈中的一部分正是Voituron研究小组的研究对象。
In 14 of the 20 countries studied, these increases in wealth outpaced the growth of their population, leaving per-person wealth higher in 2008 than in 1990.
在调研的20个国家中，14个国家的财富增长速度超过人口增速，使得2008年的人均财富高于1990年。
Studied on the relationship between leaf area composition of population and photosynthetic production of rice at middle growth stage.
通过密肥试验，研究水稻生育中期群体叶面积组成与光合生产的关系。
Based on the administrative distinction, this paper studied the issues of population distribution with different spatial scales.
论文通过划分行政区等级，在不同的空间尺度下研究人口的分布问题。
Wheat population quality, root system distribution, grain yield and quality were studied under different fertilizer application treatment in the condition of superhighyielding wheat cultivation.
在小麦超高产栽培条件下利用不同施肥量和不同施肥比例的处理，研究了小麦群体质量、根系分布、子粒产量和品质。
The community structure and population distribution of rotifera in Dongchang Lake was studied.
对东昌湖轮虫群落结构、种群分布和丰度进行了初步研究。
Effect of temperature on development, survival, reproduction, population parameter and population trend index of Spodoptera litura (Fabricius) were studied.
研究了温度对斜纹夜蛾的发育、存活、生殖、种群参数和种群趋势指数的影响。
Relationships between gene frequencies of a metric character and maximum, minimum population means are studied by differentiation.
本文利用微分学知识，研究了数量性状的基因频率与群体最大和最小均值的关系。
The effects of light distribution in maize population on grain yield and quality were studied by determining the light distribution character among different plant densities.
通过测定不同种植密度玉米群体的光能分布，研究了群体光能分布特征对玉米产量和品质的影响。
Community structure of planktonic crustacean in the Xiqi river, Hangzhou including species composition, population dynamics and biomass, was studied .
本文研究了杭州西溪河浮游甲壳动物的种类组成、种群动态、生物量及其与环境因子的关系。
By taxing about some over-exploitation populations how to restore optimal population level is moderately studied.
对系统某些种群因捕获造成过度开发，如何通过征税恢复最优种群水平作了适当的研究；
Influence of the slopes with different directions on population regeneration was also studied, and it showed that the slope direction was one important factor for regeneration.
坡向对锐齿槲栎种群的更新有重要影响，光照好的东南坡上的更新情况明显比光照较少的西北坡好。
A numerical method is studied for an age-structured population model with space-limited recruitment.
对一类有限空间年龄结构种群模型提出了一种数值方法。
The asymptotical behavior of population models with diffusion is studied.
研究了一般的具有周期环境扩散种群模型的渐近性态。
In this paper, the optimal distributed control problems for a class of age-dependent non-linear population diffusion system with final state observation are studied.
讨论了一类具终端观测且与年龄相关的非线性时变种群扩散系统的最优分布控制问题。
The spawning times, absolute fecundities, age structures of breeding population, and spawning types of fish were also studied.
测定分析鱼类生殖力、产卵期、繁殖群体的年龄结构及产卵类型。
Method The dynamic changes of natural infections of the population and mosquito vectors were studied by vertical and horizontal surveillance systems.
方法通过建立纵向、横向监测系统，观察人群和蚊媒的自然感染变化情况。
Method The dynamic changes of natural infections of the population and mosquito vectors were studied by vertical and horizontal surveillance systems.
方法通过建立纵向、横向监测系统，观察人群和蚊媒的自然感染变化情况。
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