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非进食障碍肥胖者在IGT中决策的Meta分析

2020-07-04李亚铃鲁玉洁谭巧文王志宏郭宗君

青岛大学学报(医学版) 2020年3期
关键词:肥胖症Meta分析决策

李亚铃 鲁玉洁 谭巧文 王志宏 郭宗君

[摘要] 目的 分析非進食障碍肥胖人群在爱荷华州赌博任务(IGT)中的决策情况。

方法 计算机检索万方中文科技期刊数据库、中国知网、Pubmed、Web of Science、Elsevier ScienceDirect数据库中所有关于IGT测量非进食障碍肥胖者决策的随机对照试验,检索年限为数据库建库至2019年7月,语种为中、英文。由两位研究者按照制定的纳入与排除标准和Jadad质量评分表独立筛选、评估文献,提取数据。用RevMan 5.3软件进行Meta分析。

结果 共有9篇文献符合要求纳入研究。Meta分析结果显示,非进食障碍肥胖组IGT总净得分明显低于健康对照组,差异具有统计学意义(MD=-12.28,95%CI=-15.52~-9.04,P<0.001)。IGT中的Block1结果显示,两组间任务表现差异无统计学意义(MD=0.26,95%CI=-0.68~1.20,P>0.05);Block2~5结果显示,非进食障碍肥胖组IGT得分明显低于健康对照组,差异具有统计学意义(Block2:MD=-2.93,95%CI=-4.39~-1.47,P<0.001;Block3:MD=-2.94,95%CI=-4.44~-1.45,P<0.001;Block4:MD=-3.45,95%CI=-4.80~-2.10,P<0.001;Block5:MD=-3.59,95%CI=-5.60~-1.58,P<0.001)。

结论 非进食障碍肥胖人群的决策能力明显受损。

[关键词] 肥胖症;决策;Meta分析

[中图分类号] R589.25;R395.1

[文献标志码] A

[文章编号] 2096-5532(2020)03-0313-05

doi:10.11712/jms.2096-5532.2020.56.111

[开放科学(资源服务)标识码(OSID)]

[网络出版] https://kns.cnki.net/kcms/detail/37.1517.R.20200610.1354.001.html;2020-06-11 11:14

DECISION MAKING IN IOWA GAMBLING TASK IN OBESE INDIVIDUALS WITHOUT EATING DISORDERS: A META-ANALYSIS

LI Yaling, LU Yujie, TAN Qiaowen, WANG Zhihong, GUO Zongjun

(Department of Geriatrics, The Affiliated Hospital of Qingdao University, Qingdao 266003, China)

[ABSTRACT]ObjectiveTo investigate the decision-making ability of obese individuals without eating disorders in Iowa Gambling Task (IGT).

MethodsWanfang Data, CNKI, PubMed, Web of Science, and Elsevier ScienceDirect were searched for randomized controlled trials (RCTs) on IGT for evaluating the decision-making ability in obese individuals without eating disorders published up to July 2019 and written in English or Chinese. Two researchers independently performed literature screening, assessment, and data extraction according to the inclusion and exclusion criteria and the Jadad quality scale, and RevMan 5.3 was used to perform the Meta-analysis.

ResultsA total of 9 RCTs which met the requirements were included in the study. The Meta-analysis showed that the non-eating disorder obese group had a significantly lower total net score of IGT than the healthy control group (mean difference (MD)=-12.28,95% confidence interval (CI)=-15.52 to -9.04,P<0.001). The results of Block1 in IGT showed that there was no significant difference in task performance between the two groups (MD=0.26,95%CI=-0.68 to 1.20,P>0.05), and the results of Block2-5 showed that the non-eating disorder obese group had a significantly lower IGT score than the healthy control group (Block2:MD=-2.93,95%CI=-4.39 to -1.47,P<0.001; Block3:MD=-2.94,95%CI=-4.44 to -1.45,P<0.001; Block4:MD=-3.45,95%CI=-4.80 to -2.10,P<0.001; Block5:MD=-3.59,95%CI=-5.60 to -1.58,P<0.001).

ConclusionImpaired decision-making ability is observed in obese individuals without eating disorders.

[KEY WORDS]obesity; decision making; Meta-analysis

在当今发达国家和发展中国家中,肥胖患病率正逐步上升[1-2]。肥胖会导致多种疾病的发生发展,包括心血管疾病、糖尿病[3],同时肥胖也是焦虑症和抑郁症等精神疾病的危险因素[4],这严重影响了肥胖者正常的社交和生活。有研究认为,肥胖特别是伴有进食障碍者存在脑部前额叶皮质异常,特别是在腹内侧前额叶皮质(vmPFC)和背外侧前额叶皮质(DLPFC)区域,这些脑区的异常可能与肥胖者的行为表现有关[5]。

决策是对选择的后果进行反思后作出选择的认知过程,其中前额叶皮质区的DLPFC和vmPFC起关键的作用[6]。决策通常通过爱荷华州赌博任务(IGT)来进行评估,IGT是一个以赚钱为目标的简单纸牌任务,用来评估风险偏好,通过考虑不确定性、奖励和惩罚来模拟现实生活中的决策策略[7]。IGT允许模糊性和风险下的决策,其中的Block1对应以未知事件为特征的模糊性决策,而Block2~5对应以可能结果的已知概率分布为特征的风险决策[8]。该任务可应用于评估vmPFC病变的行为特点,其结果表明vmPFC损伤可能导致IGT表现异常[9]。有研究表明,肥胖经常与进食障碍尤其是暴饮暴食和相关疾病导致的决策受损有关[10-13]。但是目前对于非进食障碍肥胖病人决策情况的相关临床对照试验较少,样本量不足,难以全面评估这类人群的决策差异。故本研究通过检索国内外已发表的文献,利用Meta分析方法进行综合统计、定量分析与评价,探讨非进食障碍肥胖者的决策情况,为实现有效控制体质量和减肥的治疗策略提供理论依据。现将结果报告如下。

1 资料和方法

1.1 资料来源

由两名研究者独立检索万方中文科技期刊数据库、中国知网、Pubmed、Web of Science及Elsevier ScienceDirect数据库中所有关于IGT测量非进食障碍肥胖者决策的随机对照试验,并将检索结果进行合并,根据纳入标准和排除标准选取符合标准的中英文文献,若有分歧,则经两名研究者讨论后达成一致。中文数据库检索关键词为肥胖、决策、爱荷华州赌博任务,检索式为“肥胖”和“决策或爱荷华州赌博任务或赌博任务”。英文数据库的检索策略为,以“Obesity”AND“Decision making OR Iowa Gambling Task OR Gambling Task”为检索式进行检索。检索年限为数据库建库至2019年7月。根据初次检索所得文献的参考文献,再行扩大检索。

1.2 文献纳入和排除标准

纳入标准:①原始文献有明确的分组,明确没有暴饮暴食或者其他进食障碍;②研究结果报告了IGT得分;③非进食障碍肥胖组(简称肥胖组,体质量指数(BMI)≥30 kg/m2)与正常体质量(BMI<30 kg/m2)的健康对照组进行了比较。排除标准:①暴饮暴食病人和具有其他进食障碍者;②重复报告、质量差、报道信息太少及无法利用的文献;③研究类型为动物实验。

1.3 质量评价

文献的质量采用Jadad质量评分表评价,总评分1~3分为低质量,4~7分为高质量。分别从以下几个方面进行评价:随机分组序列产生方法(0~2分),分配隐藏(0~2分),双盲法(0~2分),退出与失访(0~1分)。

1.4 数据提取

由两名研究者单独对纳入文献进行数据提取,提取的数据包括文献的第一作者和发表时间,以及肥胖组和健康对照组的样本数、年龄、性别、BMI、受教育年限和IGT净得分(有利选择减去不利选择)等。对IGT中5个Block分别提取IGT得分,区别模糊决策和风险决策。

1.5 统計分析

应用Cochrane协作网提供的Meta分析软件RevMan 5.3进行统计学分析。采用Q统计量评估研究异质性:当I2<25%时,认为不存在异质性;当25%≤I2<50%时,则认为研究存在轻度异质性;当50%≤I2<75%时,认为存在中度异质性;当I2≥75%时,认为存在重度异质性。采用随机效应模型进行Meta分析,Meta分析中的连续变量以x±s表示,计算均数差(MD)及其95%置信区间(CI),当95%CI不为0且P<0.05时,即认为差异有显著性。采用漏斗图评估发表偏倚。

2 结果

2.1 纳入文献基本特征

初步筛选后得到文献1 190篇,排除重复出现的文献及与研究目的无关的文献后剩余108篇,通过进一步阅读全文排除了综述、动物实验性研究,纳入文献13篇,其中4篇由于数据不全被排除,最终纳入文献9篇[14-22]。9篇均为英文文献,其中5篇为低质量文献,4篇为高质量文献。纳入文献特征见表1。

2.2 Meta分析

异质性分析结果显示,各研究间异质性可以被接受(P>0.1;Q=4.94,df=8,I2=0)。采用随机效应模型进行Meta分析,结果显示,肥胖组IGT净得分低于健康对照组,差异具有统计学意义(MD=-12.28,95%CI=-15.52~-9.04,P<0.001)。见图1。有4篇文献提供了5个环节的具体数据,对这4篇文献的Meta分析结果显示,在模糊环境下(Block1环节),肥胖组与健康对照组的IGT得分差异无显著性(MD=0.26,95%CI=-0.68~1.20,P>0.05);在风险环境下(Block2~5环节),肥胖组的IGT得分明显低于健康对照组,差异具有统计学意义(Block2:MD=-2.93,95%CI=-4.39~-1.47,P<0.001;Block3:MD=-2.94,95%CI=-4.44~-1.45,P<0.001;Block4:MD=-3.45,95%CI=-4.80~-2.10,P<0.001;Block5:MD=-3.59,95%CI=-5.60~-1.58,P<0.001)。见图2。从漏斗图中可以看出,纳入的各项研究基本呈对称分布,提示不存在发表偏倚。两组IGT净得分比较漏斗图见图3。

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(本文編辑 马伟平)

[收稿日期]2019-11-15; [修订日期]2020-04-07

[基金项目]山东省科技发展计划项目(2011YD18045);山东省自然科学基金资助项目(ZR2012HM049);青岛市科技局科研基金资助项目(09-1-1-33-nsh;15-9-2-74-nsh);青岛市黄岛区科技局科研基金资助项目(2014-1-73)。

[第一作者]李亚铃(1993-),女,硕士研究生。

[通信作者]郭宗君(1964-),男,博士,主任医师,硕士生导师。E-mail:guozjj@163.com。

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