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           important indicator for estimating visceral fat accumulation,could be used to predict MS more directly. However,few studies
           have explored whether VAI mediates the association between SUA/Scr ratio and MS in euthyroid population. Objective To
           explore the mediating effect of VAI on SUA/Scr ratio and MS in people with normal thyroid function. Methods A total of 10 042
           annual health examinees were selected from the Health Examination Center,Hebei General Hospital from January 2020 to June
           2021. The basic demographic information,physical examination and biochemical parameters,as well as calculated SUA/Scr ratio
           and VAI were collected. MS was diagnosed according to the criteria recommended by Chinese Diabetes Society. The risk of MS was
           analyzed by quartiles of SUA/Scr ratio(Q1-Q4 quartiles),and VAI(V1-V4 quartiles),respectively. Pearson correlation
           analysis was used to explore the association between SUA/Scr ratio and VAI. Multivariate Logistic regression analysis was used to
           explore the association of SUA/Scr ratio and VAI with MS. Bootstrap was used to explore whether VAI mediated the association
           between SUA/Scr ratio and MS. Results Of the 10 042 participants,1 833(18.25%) had MS and 8 209(81.75%) did
           not. Pearson correlation analysis showed that SUA/Scr ratio was positively associated with VAI(P<0.05). Multivariate Logistic
           regression analysis indicated that compared with Q1 group,the risk of MS significantly increased in Q2 group〔OR=1.310,
           95%CI(1.039,1.651)〕,Q3 group〔OR=1.372,95%CI(1.089,1.729)〕,and Q4 group〔OR=1.744,95%CI(1.381,
           2.203)〕(P<0.05). Compared with V1 group,the risk of MS notably increased in V3 group〔OR=6.721,95%CI(4.600,9.819)〕
           and V4 group〔OR=33.327,95%CI(21.509,51.640)〕(P<0.01). Mediating effect analysis indicated that SUA/Scr
           ratio significantly,directly influenced MS prevalence〔β=0.154,95%CI(0.104,0.205)〕,and VAI partly mediated the
           indirect effect of SUA/Scr ratio on MS prevalence〔β=0.183,95%CI(0.156,0.213)〕,and the mediating effect accounted
           for 54.25% of the total effects. Conclusion Both SUA/Scr ratio and VAI were predictors of MS,and VAI partly mediated the
           indirect effect of SUA/Scr ratio on MS prevalence in population with normal thyroid function.
               【Key words】 Metabolic syndrome;Visceral adiposity index;Serum uric acid;Serum creatinine;Thyroid function;
           Mediating effect


               代谢综合征(MS)是一组包括中心性肥胖、胰岛素
                                                                行业贡献:
           抵抗、葡萄糖调节异常、脂质代谢紊乱和高血压等多种
                                                                    (1)本研究选取甲状腺功能正常人群,采用标
           代谢异常的临床综合征,其中中心性肥胖和胰岛素抵抗                             化血尿酸(SUA)〔SUA/ 血肌酐比值(SUA/Scr)〕
           是 MS 的中心环节    [1] 。MS 的发病是一个慢性隐匿的过程,
                                                                进行分析,一定程度上控制了甲状腺功能和肾功能对
           受遗传及环境因素共同影响。近年来由于患病率增加和
                                                                代谢综合征(MS)的影响,结果提示在甲状腺功能
           预后不良,MS 已成为影响人类健康的重要公共卫生问
                                                                正常人群中,SUA/Scr 水平能够较好地预测 MS 的发
           题之一。据报道,目前我国 MS 防控形势严峻,成年人                           生风险。
           患病率已达 33.9%,并且随着年龄的增长而增加                  [2-3] 。
                                                                    (2)建立中介效应模型,分析内脏脂肪指数
           因此需要早期发现 MS 发生的危险因素及机制,进行有
                                                                (VAI)对 SUA/Scr 与 MS 关联的中介效应,结果显
           效地监测和防控,从而达到预防或逆转 MS 的目的。
                                                                示 VAI 部分介导了 SUA/Scr 对 MS 发病率的影响,提
               血尿酸(SUA)是嘌呤代谢的主要产物。既往研究
                                                                示在临床工作中不能忽视腹型肥胖的存在,而 VAI
           表明,SUA 虽然不是诊断 MS 的标准之一,但与高血压、
                                                                的常规监测可能成为预防肥胖及 MS 的重要方法。
           心血管疾病及 MS 的发生风险密切相关,可作为 MS 的                             (3)尽管本研究未发现 SUA/Scr 与 MS 之间相关
           预测指标    [4] 。即使在 SUA 正常情况下,SUA 水平与
                                                                性的确切机制,但脂质代谢紊乱可能为两者间相关的
           MS 的发病率之间也存在显著相关性。由于 SUA 主要经
                                                                原因,这为今后开展 MS 风险预测和干预提供了一定
           由肾脏排出,而肾功能受损可影响 SUA 的清除,是研
                                                                依据。
           究中的混杂因素,因此采用标化 SUA〔SUA/ 血肌酐比
           值(SUA/Scr)〕可在一定程度上控制肾功能的影响,                             目前研究已表明,甲状腺激素对维持人体正常代谢
           能够更好地预测 MS 及相关疾病          [5] 。内脏脂肪指数(VAI)          起重要作用,甲状腺功能紊乱会影响血脂、血糖、体质
           作为内脏脂肪分布的新型评价指标,与内脏脂肪组织的                            指数(BMI)等代谢指标的水平,尤其甲状腺功能减退
           面积和体积有关       [6] 。研究显示,与皮下脂肪组织相比,                  的患者 MS 患病风险会明显增加            [8] 。因此,本研究拟
           内脏脂肪组织与胰岛素抵抗及 MS 显著相关,VAI 可更                        排除甲状腺功能异常对 MS 各组分的影响,探讨甲状腺
           直接地预测 MS、2 型糖尿病与心血管疾病的风险                   [7] 。    功能正常人群中 SUA/Scr 与 MS 间的关系,同时,分析
           但目前国内外关于 VAI 对 SUA/Scr 与 MS 之间关联的中                  VAI 对 SUA/Scr 和 MS 之间关联的中介效应,为防治 MS
           介效应的研究较少。                                           及相关心血管疾病提供新的思路及更多临床依据。
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