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大多数人类疾病不止和遗传因素有关,也受多种环境因素的影响[1-5]。25%—33%的全球疾病负担可以归因于环境因素,对于儿童而言这一比例甚至更高[6]。研究发现环境污染物如金属和抗氧化剂在癌症的发生过程中起着重要作用[7],室外空气污染导致了全球3.3%的过早死亡的发生[8],另外环境因素也会影响基因的表达过程,从而影响疾病的发生[9]。为了表征复杂的环境因素,参照基因组、代谢组和蛋白质组的概念,Wild等在2005年提出暴露组的概念[10]。暴露组涵盖了个体从受精卵到死亡整个生命周期历经的所有暴露,可以分为三大类:内部暴露、特定外部暴露和广泛外部暴露[11]。内部暴露主要包括体内的过程,诸如代谢、肠道菌群、炎症、脂质过氧化、氧化应激和衰老等,特定的外部暴露包括辐射、传染源、化学污染物、饮食和生活方式等,广泛的外部暴露则主要是社会、经济和心理方面的因素,包括社会资本、教育、财务状况、心理和精神压力以及城乡环境气候等。为了评估暴露组-疾病的相关关系,参照全基因组关联研究(GWAS),Patel等引入了全环境关联分析的概念,并将其应用于研究与Ⅱ型糖尿病相关的多种环境因素[12]。
与GWAS的成熟体系有所不同的是,对暴露组-疾病关联的研究体系还未得到统一。在Patel等引入全环境关联分析(environment-wide association study)的概念之后[12],又有研究者引入了全暴露组广泛关联研究(exposome-wide association study)[13]、邻域广泛关联研究(neighborhood-wide association study)[14]和邻域环境广泛关联研究(neighborhood environment-wide association study)[15]的概念。这些不同的概念在对于暴露变量的选取上各有侧重,全环境关联分析主要选取内部暴露和特定的外部暴露变量,包括化学污染物和体内的代谢情况, 邻域广泛关联研究和邻域环境广泛关联研究则主要选取广泛的外部暴露变量,包括社会经济地位和自然环境特征等。为了更全面地描述暴露组,在本综述中将不对这些概念进行严格区分,而将其均纳入全暴露组关联分析(EWAS)的范畴中。
全暴露组关联分析是一种数据驱动、无目的、不可知的探索性研究方法,旨在确定与疾病相关的环境因素[16]。本文将对全暴露组关联分析的研究对象、暴露因素、流行病学结局和统计分析进行介绍,综述目前的研究进展,讨论研究的特定和局限,并对未来方向进行展望。
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全暴露组关联研究一般先确定研究对象的暴露变量和疾病相关结局,再筛选和疾病有显著关系的暴露变量,识别重要的暴露因子。因此本文将从研究对象、选取的暴露变量、流行病学结局和统计分析手段几个方面来综述研究方法。如表1所示,共有28个研究被纳入讨论中。
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全暴露组关联分析的参与者人数差异较大,最少仅473人[31],最多至819399人[35],其中有3个研究针对老年人进行[15, 19, 22],7个研究针对婴幼儿和儿童进行[30, 32-33, 36-37, 40-41],其余均为针对成年人的研究。大多数研究为横断面研究和纵向队列研究,也存在一例病例对照研究[24]。有11项研究[12, 17-18, 20-21, 23, 25-27, 38-39]采用了美国营养与健康调查(NHANES)的队列数据,这是由美国疾病控制与预防中心(CDC)每两年进行一次的全国性的健康调查,数据集公开提供。另外有5项研究[30, 32-33, 36-37]采用了人类早期暴露计划(HELIX)的纵向队列,这项计划由欧洲13个机构合作开展,研究32000对母婴的暴露状况,试图描绘欧洲人口早期生命暴露,并阐明其与胎儿和儿童健康之间的关系[42]。
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EWAS研究中涉及到的暴露变量总数在11—14663之间,中位数为205个。暴露种类涉及到内部暴露如营养素等,特定的外部暴露如污染物等,广泛的外部暴露如人口学变量和社会经济因素,具体可分为以下几类:(1)微量营养素:如维生素,通过血液和尿液生物标志物测定;(2)代谢物和蛋白质:如脂肪酸和C-反应蛋白等,通过血液和尿液生物标志物测定;(3)污染物:常见的包括重金属、酚类、持久性有机污染物、氟化物、有机磷农药和内分泌干扰物等,通过血液和尿液生物标志物测定;(4)生活方式:包括饮食、社交、体育锻炼、吸烟和酒精摄入等,通过问卷调查获取;(5)建筑环境:包括公共设施比例、建筑密度、绿化面积和道路交通状况等,通常通过社区调查数据集、谷歌街景和政府部门网站获得;(6)大气条件:包括空气污染物(如二氧化氮、PM2.5和PM10)、紫外线强度、空气湿度和温度等,数据通常通过当地监测站和气象部门获得;(7)社会因素:如财务状况、受教育程度、休闲旅行、婚姻状态和心理健康状况等,通过问卷调查获取。文章中涉及最多的暴露变量是污染物(19/27)和生活方式(16/27)。
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流行病学研究发现环境因素在某些疾病发展过程中起到重要因素,多个持久性有机污染物被发现与糖尿病的发展有关[43],环境暴露可能通过影响血压、血脂和动脉粥样硬化而对心血管疾病的发展起重要作用[26]。此外,吸烟、石棉和二氧化硅会导致肺癌的发生[44],而生活方式的改变会影响前列腺癌的遗传[45]。孕期的环境暴露不仅影响妊娠高血压[46]和早产[47]的发生,对胎儿的生长发育也存在不良效应[48]。基于此,EWAS评估了多种不同的结局,包括疾病如2型糖尿病、代谢综合征、1型糖尿病、心血管疾病、动脉粥样硬化、艾滋病、前列腺癌;临床指标如血脂水平、白细胞端粒长度、血细胞比容、甲状腺激素、血压睾丸激素缺乏、精液质量和蛋白尿;健康状态如身体活动、腹部肥胖和身心健康;孕妇儿童相关的妊娠高血压、早产、胎儿体重、儿童超重、儿童血压、儿童肺功能和儿童精神运动发育,以及一项研究评估了和全因死亡率相关的因素。
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为了探究暴露组和健康之间的关系,最常用的方法是EWAS方法[12],即进行多重假设检验,单独探究每一种暴露因素和结局之间的关系。EWAS方法中最常用的统计模型是广义线性回归模型,当结果变量为二分类变量时则采用logistic回归,结果变量为连续变量时则采用线性回归或加权线性回归,研究通常将协变量纳入模型以对模型进行调整。为了控制多重检验的假阳性率,一般采用Benjamini&Hochberg校正[49]或Bonferroni校正[50],前者通过为p值排序后将原始p值乘以检验次数后除以排名得到校正后的p值,后者则用设定的p值阈值除以检验次数得到校正后的p值阈值,Bonferroni校正相对而言更为严格,假阳性率更低,但也更容易拒绝真正的阳性结果。除了一项研究[18]采用cox比例风险回归外,其它所有研究都采用了EWAS方法,其中有6项研究[19, 22, 28-29, 41]采用了EWAS两步法(EWAS2),即在用EWAS发现显著性相关的变量后,将所有显著变量纳入回归模型中进行多变量线性回归(EWAS-MLR)。
另外几种常用的统计模型包括DSA算法、主成分分析和随机森林等。DSA算法是一种迭代的线性回归模型[51],在每次迭代中允许进行以下3种操作:(1)删除一个变量;(2)替代一个变量;(3)添加一个变量,通过交叉验证得到的均方根误差来选择最终的模型。有5项研究[30, 32-33, 36-37]采用了这种算法,其中有一项研究是在采用了EWAS算法后将显著因子纳入DSA模型中[37],其余研究则将DSA和EWAS并列使用。在对比几种常用的线性回归模型后,Agier等[52]和Barrera等[53]认为DSA模型假阳性率低,整体性能较好。另外一些研究中涉及到的套索回归[15]和弹性网络回归[35]则是在最小二乘法回归的损失函数中加入正则化项以约束系数,达到收缩系数和稀疏变量的目的,可以剔除冗余变量,仅保留和结果相关程度高的变量。此外,有3项研究[14, 25, 39]用到了主成分分析(PCA)的方法,将变量折射到几个主成分上,再找到影响主成分最多的变量。有2项研究[15, 26]采用了随机森林算法,这是一种强大的集成学习方法[54],其从原始数据集有放回地抽样,得到多个子集,训练多个子决策树后再对结果进行结合,在子决策树的每一次分裂时随机选取一个包含一定特征的子集,在其中找到最优的属性用于划分。模型最终可以得到优先级较高的属性,即对结果有较大影响的变量。
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胡萝卜素是从某些水果和蔬菜中获得的维生素A前体,具有抗氧化作用[55]。全暴露组关联研究发现,β-胡萝卜素和2型糖尿病[12]、动脉粥样硬化[27]、心血管疾病[26]、甘油三酯水平[17]和腹部肥胖[25]显著负相关,与高密度脂蛋白胆固醇(HDL-C)正相关[17],而高密度脂蛋白胆固醇含量与患心血管病风险呈负相关[56],这些结果强烈暗示了β-胡萝卜素有助于降低糖尿病和心血管疾病风险,且在多个关联研究中相统一。在先前的研究中已经发现,β-胡萝卜素的抗氧化作用,可以减少氧化应激损伤,从而降低心血管疾病风险[57-59],然而在服用β-胡萝卜素的随机实验中却发现了矛盾的结论[60]。一种类胡萝卜素,番茄红素,被发现和全因死亡率显著负相关[18],而之前的流行病学研究、动物研究和临床实验也发现了番茄红素可以预防慢性疾病的发生[61]。另外一种类胡萝卜素β-隐黄素被发现与腹部肥胖显著负相关[25],然而一篇关联研究表明其与早产显著正相关[20],作者表示可能有因果颠倒的发生,即早产后补充营养而导致营养素升高。维生素A的水平和白细胞端粒长度[21]、睾丸激素水平[39]正相关,然而关联分析也发现维生素A和血细胞比容[22]、心血管疾病[26]之间的正相关关系,暗示了其可能与心血管疾病发生有关。总体而言,营养素与疾病的发生之间存在着复杂的关系,而不是单向关系,在补充营养素时也应该慎重考虑。
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不饱和脂肪酸如亚油酸是人体的必需脂肪酸,关联研究发现高棕榈酸和油酸水平以及较低的亚油酸与代谢综合征显著相关[19],暗示了不饱和脂肪酸相对于饱和脂肪酸对人体更有益。C-反应蛋白(CPR)是机体受到感染或组织损伤后急剧上升的蛋白质,EWAS发现C-反应蛋白和白细胞端粒长度显著负相关[21],和心血管疾病以及动脉粥样硬化显著正相关[26-27],暗示了炎症反应对机体的不良影响,并可能与衰老有关。先前的研究中已经发现C反应蛋白与心血管疾病和死亡率之间的正相关关系[62-64],可以作为心血管疾病的生物标志物[65]。另外EWAS研究发现血糖、尿酸和尿白蛋白与动脉粥样硬化、心血管疾病相关[26-27],与先前的研究结果具有一致性[66-68]。
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已有研究表明暴露于污染物可能对人类健康产生诸多不利影响[69-72],在全暴露组关联分析中也发现了污染物和疾病之间显著的相关关系。多氯联苯是一类人工合成的有机物,由于其持久存在和高毒性被斯德哥尔摩公约(POPs公约)禁止使用,Patel等[12]发现多氯联苯和2型糖尿病存在显著的正相关关系,在先前的病例对照研究中也发现了多氯联苯和2型糖尿病患病率显著正相关[73],为多关联分析的结果进行了佐证。此外,多氯联苯被发现和白细胞端粒长度有显著的正相关关系[21],孕妇体内的多氯联苯可能导致儿童收缩压较低[30],这种关联难以解释,可能存在因果颠倒或间接相关。其它卤代有机物也被发现和不良结局之间的显著关联,如二氯二苯二氯乙烯(DDE)被发现与代谢综合征显著正相关[19],和儿童收缩压显著负相关[30]。在最近的研究中已经发现DDE会显著改变小鼠肠道微生物组成并影响血浆脂质代谢和导致脂肪组织功能障碍[74-75],这可能是其导致代谢综合征的机理。环氧七氯是一种杀虫剂,毒性较强且难以降解,被发现与2型糖尿病显著正相关[12],有机氯农药曾被报道和糖尿病之间的关联[76-77],但这是首次发现环氧七氯和2型糖尿病的正相关关系。全氟化合物由于广泛的使用和在环境中难以降解而被广泛检出,全氟辛酸(PFOA)由于其较强的毒性和生物蓄积性已被列入POPs公约。关联分析发现儿童体内PFOA水平和收缩压正相关[30],和肺功能显著负相关[33]。最近的一项关于全氟化合物和儿童肺功能的队列研究也证明了这一关联[78]。塑化剂类物质如双酚A、邻苯二甲酸酯等是广受关注的内分泌干扰物[79],且被发现与多种不良出生结局相关[80],关联分析表明双酚A与孕妇早产显著正相关[20],这与流行病学结果一致[81]。邻苯二甲酸卞酯和儿童收缩压降低有关[30],邻苯二甲酸酯类物质可能导致儿童肺功能损伤[33],这些结果提示我们关注孕期和儿童早期的塑化剂暴露。另外一类与疾病关联的污染物是金属离子,血清中的镉浓度和全因死亡率、动脉粥样硬化、蛋白尿风险正相关[18, 27, 38],和白细胞端粒长度负相关[21],在其它流行病学研究中也发现了镉和死亡率、心血管疾病的相关性[82-83],并且母亲产前镉暴露和新生儿端粒长度呈反比[84]。孕妇血清中铯的浓度和早产显著正相关[20],儿童血液中的铜、铯的含量与较高的BMI相关[36]。孕产妇血清中铅浓度和胎儿体重负相关[37],而成人体内血铅含量和蛋白尿风险正相关[38]。对于和疾病关联显著的污染物应加以重视。
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吸烟是导致疾病的重要风险因素[85],全暴露组关联分析研究发现吸烟行为和全因死亡率有显著的正相关关系[18],其它流行病学研究有着相似的结果[86]。尼古丁的生物标志物可替宁被发现与较高的儿童血压[30]、超重[36]、蛋白尿[38]显著正相关,临床研究也发现吸烟会使蛋白尿风险增加5倍[87]。另外一个不良生活方式是饮酒,被发现与血压正相关[23],酒精和高血压之间的关系已经被多次报道[88-90]。较为健康的生活方式主要是体育活动,体育活动被发现与全因死亡率[18]、腹部肥胖[25]、代谢综合症[19]和血细胞比容[22]显著负相关。另外有一些有趣的发现,如拥有一辆自行车和艾滋病患病率显著负相关[28]。还有一些难以解释的关联,牙齿卫生、榛子可可的摄入和被蜜蜂蛰伤与儿童Ⅰ型糖尿病显著负相关[24],这可能源于家庭收入导致的间接相关。
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公共设施密度被发现与儿童血压、肺活量、胎儿体重和儿童BMI显著负相关[30, 32-33, 36],这意味着公共设施密集的地区儿童超重会减少,但是血压和肺活量会下降。房屋密度与胎儿体重和儿童肺活量显著负相关[32-33],在一个纵向队列中得到了相同的结果[91]。同时EWAS发现房屋密度与儿童1型糖尿病患病率[40]显著正相关,这是一个较为新颖的结果。另外,母亲孕期交通设施便利和胎儿体重显著正相关[32]。
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大气条件主要包括大气污染物如PM2.5和氮氧化物,以及紫外线、空气湿度等。两篇EWAS研究均发现孕期暴露于PM2.5和胎儿体重显著负相关[32, 37],在其它流行病学研究中也发现了类似的关联[92-93]。另外一些空气毒物如丙烯醛、马来酸酐等物质被发现与妊娠高血压显著正相关[35]。空气中的二氧化氮被发现与儿童BMI显著正相关[36]。
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社会因素主要包括收入、就业和婚姻状况等社会经济因素。EWAS研究发现收入与身体活动和园艺活动显著正相关[15],而和前列腺癌显著负相关[14],这意味着收入更高的人锻炼和园艺活动更多,前列腺癌患病比例更低。婚姻状态和艾滋病有非常强烈的相关关系,已婚和丧偶与艾滋病患病率显著正相关,而正在哺乳与艾滋病显著负相关[28]。
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环境因素对人类健康有着重要的影响,已经有许多研究表明了化学污染物、自然环境、建筑环境和社会因素与疾病发展之间的显著关系[94-95]。然而这些研究主要针对于一种或几种已知的环境因素进行,而个人经历的暴露是多样而动态的,在日常生活中可能暴露于数千种生物物种和化学品[96],在社会生活中会受到广泛的影响,对单个因素的评估已经难以满足暴露组的需求。EWAS作为一种高通量、不可知的方法,可以同时评估多种环境因素并识别与疾病相关的因素,由于其并不需要先验知识,有助于我们发现新的结果,对环境-疾病的关系产生新的见解。如Hu等发现空气中的丙烯醛、马来酸酐等物质和妊娠期高血压相关[35],Patel等发现环氧七氯和二型糖尿病的正相关关系[12]。而研究中也发现了诸多和以往单因素-疾病关联研究中类似的结果,这也证明了EWAS方法的可重现性。相较于遗传因素,环境因素具有较大的时空变异性,相对更容易改变,因此EWAS不仅可以用于疾病风险预测,还可以用于疾病预防或干预。EWAS研究有以下特点:(1)无假设、无目标、不可知论的研究,即事先并不假设和结果相关联的物质;(2)通常存在确定的结局,一般为疾病或生理状态;(3)评估多个暴露组变量;(4)研究人数通常较多,由于评估的环境变量较多,基于统计学需求,通常需要足够的样本量[31]。
尽管有好的应用前景,目前的EWAS研究仍然存在诸多局限。首先,EWAS研究只能表征暴露因素和不良结果之间的相关关系,但难以说明其因果关系和作用机制。尤其是横断面研究中可能存在的反向因果偏差,即疾病状态影响了生物标志物的毒理学和浓度而不是其导致了疾病的发展。例如关联研究中发现β-隐黄素和早产的正相关关系[20],甲基叔丁基醚和妊娠高血压显著的负相关关系[35]。第二,对于暴露变量的评估存在着不同尺度和不同类型的误差,例如在化学品测定方面的误差和在问卷调查方面的误差便不相同,因此难以比较变量的显著性水平而对其重要程度进行排序。第三,尽管EWAS研究试图涵盖更多的暴露变量,其仍然难以表征整个暴露组,暴露组是一个复杂的动态概念[97],而文献对于变量的选择和数据来源各不相同。另外,如何在不牺牲对每种暴露评估准确性的前提下增加暴露变量种类仍然是一个问题。第四,由于大多数研究采用的是广义线性模型,而忽略了对于暴露变量和结果之间的非线性关联以及变量中潜在的相互作用。第五,尽管一些研究将数据集分为发现集和复制集[35],或通过内部数据集进行验证[28],然而对于结果的外部验证仍然是非常缺乏的。最后,尽管协变量通常被考虑和在模型中被调整,仍然不能排除未测定的混杂因素。
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目前的EWAS体系仍然不够完善,对于EWAS的概念并不统一,EWAS研究也存在较大的异质性[98]。为了保证EWAS结果的可重复性和再现性,仍然需要付出大量的努力。实验设计中应充分考虑样本的合理选取和分层,内部验证和外部验证,对于缺失值的合理处理(敏感性分析和多次估算),对于暴露变量的客观测量,对结局的验证评估,暴露和结局所来自数据源的可信程度等。在统计方法上,相较于传统的线性回归模型,机器学习可能会给我们新的见解[99]。另外, EWAS和GWAS的结合[28],甚至于多组学的联合[100]可能更有利于我们理解基因、环境如何联合作用于疾病。
基于全暴露组关联分析技术的环境健康研究进展
Research progress on environmental health based on exposome-wide association study
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摘要: 暴露组是整个生命周期中历经的所有暴露。为了更好地评估暴露组-疾病的关联,参照全基因组关联研究的概念(GWAS),提出了全暴露组关联分析(EWAS)。全暴露组关联分析是一种数据驱动的探索性研究方法,可用于发现与某些复杂疾病相关联的环境因素。文章搜索并纳入了当前的全暴露组关联分析文章,从研究对象、暴露变量、流行病学结局和统计分析几个方面总结了文章的研究方法,综述了目前的研究进展,提炼研究的特点和当前局限,并对其未来做出展望。Abstract: The exposome represents the totality of environmental exposures received by a person during life. To investigate the environmental causes for disease, the exposome-wide association study (EWAS) was proposed based on the concept of the genome-wide association study (GWAS). EWAS is a data-driven, exploratory research method that can be used to identify specific environmental exposures associated with complex diseases. In this article, current articles on EWAS were searched, and the research methods of EWAS were summarized from the aspects of research objects, exposures, outcomes and statistical analysis. Meanwhile, the current progresses, features and limitations of EWAS were reviewed, and the prospect of future research on EWAS was put forward.
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Key words:
- exposome /
- EWAS /
- environmental health
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表 1 EWAS的研究方法总结
Table 1. Summary of research methods of EWAS
文献
Articles参与者
Research objects暴露因素
Exposures流行病学结局
Outcomes统计方法
StatisticsPatel et al. (2010)[12] 多个队列,人数在503—3318之间 污染物、营养素,p=266 2型糖尿病 EWAS Patel et al. (2012)[17] 12973参与者 污染物、营养素,p=188 血脂水平 EWAS Patel et al. (2013)[18] 330—6008参与者 生活方式、污染物、营养素,p=249 全因死亡率 cox比例风险回归 Lind et al. (2013)[19] 1016名老年人 生活方式、污染物、代谢物,p=76 代谢综合征 EWAS-MLR Patel et al. (2014)[20] 780名怀孕一次女性 污染物、营养素 ,p=201 早产 EWAS Patel et al. (2016)[21] 7827名成年人 污染物、生活方式、营养素、代谢物,p=461 白细胞端粒长度 EWAS Zhong et al. (2016)[22] 20443名老年人 营养素、污染物、生活方式,p=73 血细胞比容 EWAS-MLR McGinnis et al. (2016)[23] 71916名参与者 污染物、生活方式,p=429 血压 EWAS-随机效应荟萃分析 Balazard et al. (2016)[24] 1151名患者和689个对照 生活方式、社会因素,p=845 1型糖尿病 EWAS Lynch et al. (2017)[14] 77086名男性 社会因素,p=14663 前列腺癌 EWAS -贝叶斯分层逻辑回归-主成分分析 Mooney et al. (2017)[15] 3497名65—75岁老人 社会因素,p=337 身体活动 EWAS、套索回归、随机森林 Wulaningsih et al.
(2017)[25]7403名男性,8238名女性 营养素、生活方式,p=182 腹部肥胖 EWAS -主成分分析 Zhuang et al. (2018)[26] 43568名参与者 污染物、营养素、代谢物,p=335 心血管疾病 EWAS -随机森林 Zhuang et al. (2018)[27] 6819名参与者 污染物、生活方式、营养素、代谢物,p=417 动脉粥样硬化 EWAS -AIC准则惩罚回归 Patel et al. (2018)[28] 15433名女性 污染物、生活方式、社会因素,p=1415 艾滋病 EWAS-MLR 郭静 (2019)[29] 915名孕妇 污染物,p=11 甲状腺激素 EWAS-MLR Warembourg et al.
(2019)[30]1277名6—11岁儿童 污染物、生活方式、建筑环境、大气条件,p=217 儿童血压 DSA算法、EWAS Chung et al. (2019)[31] 473名男性 污染物,p=128 精液质量 EWAS Nieuwenhuijsen et al. (2019)[32] 31458对母婴 建筑环境、大气条件,p=60 胎儿体重 DSA算法、EWAS Agier et al. (2019)[33] 1033对母子 污染物、建筑环境、生活方式、大气条件,p=210 儿童肺功能 DSA算法、 EWAS Ni et al. (2019)[34] 10484名参与者 生活方式,社会因素,p=194 身心健康 EWAS Hu et al. (2020)[35] 819399名有过产子记录的
妇女建筑环境、大气条件,p=5784 妊娠高血压 EWAS-弹性网模型-MLR Vrijheid et al. (2020)[36] 1301名6—11岁儿童及其
母亲污染物、生活方式、建筑环境、大气条件,p=173 儿童体重 EWAS-DSA算法 Agier et al. (2020)[37] 1287对母婴 污染物、生活方式、大气条件,p=131 胎儿体重 DSA算法、EWAS Lee et al. (2020)[38] 46748名成年人 污染物,p=262 蛋白尿 EWAS Lopez et al. (2020)[39] 1316名成年男性 营养素、生活方式,p=173 睾丸激素缺乏 EWAS-MLR、主成分分析 Sheehan et al. (2020)[40] 13948名0—9岁糖尿病患者 建筑环境、大气条件、社会因素,p=53 1型糖尿病 EWAS(泊松回归)-贝叶斯泊松回归-多元泊松回归 Calamandrei et al.
(2020)[41]984名儿童 污染物、社会因素、生活方式,p=29 精神运动发育 EWAS-MLR 注:p代表暴露因素的个数. p refers to the number of exposure factors.
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