Association between CMI and Hyperuricemia with normal BMI

1Department of Health Physical Examination Center, The 2nd Hospital of Hebei Medical University, Shijiazhuang, People’s Republic of China; 2Department of Imaging Center, The 2nd Hospital of Hebei Medical University, Shijiazhuang, People’s Republic of China

Background and Purpose: The association between the cardiometabolic index (CMI) and hyperuricemia was investigated to provide theoretical support for the management of hyperuricemia in an asymptomatic population with normal body mass index (BMI).
Methods: A cross-sectional study was carried out among 374 asymptomatic adults with normal BMI. Traditional anthropometric indices and CMI were calculated. Anthropometric indices were divided into four quartiles and multivariate logistic analysis was used to analyze the association between these indices and hyperuricemia. Receiver operating characteristic (ROC) curves and area under the curve (AUC) were used to evaluate the power of the indices to predict hyperuricemia values. The DeLong test was used to compare the AUC of different anthropometric indices.
Results: After adjusting for confounding variables, the CMI exhibited a stronger association with hyperuricemia than other anthropometric indices. The odds ratio (OR) for hyperuricemia in the highest quartile of the CMI was 16.674 (confidence interval [CI]=4.424– 62.846). The AUC of the CMI was 0.777 (95% CI=0.719– 0.835, pConclusion: The CMI, which combines waist circumference, height and blood lipid parameters, was more strongly associated with hyperuricemia than other anthropometric indices in asymptomatic population with normal BMI. The CMI may serve as a potential monitoring indicator for hyperuricemia management in asymptomatic populations with normal BMI.

Keywords: cardiometabolic index, hyperuricemia, visceral adiposity index, lipid accumulation product


Hyperuricemia is highly prevalent worldwide, as previously reported for random general populations, ranging from 13.2% in China to 21.2% in the US.1,2 Hyperuricemia not only contributes to gout and nephrolithiasis but is also related to metabolic syndrome (MS), cardiovascular disease, and non-alcoholic fatty liver disease. There are many factors related to the pathogenesis of hyperuricemia, with obesity considered to be a particularly important factor, so recommendations for the management of hyperuricemia have typically emphasized the beneficial effects of weight loss.3 However, there are still many asymptomatic adults with normal body mass index (BMI) who have hyperuricemia. Therefore, the development of accurate and cost-efficient screening tools for hyperuricemia in the population with normal BMI is urgently needed.

There are many anthropometric indices which have been developed to evaluate adiposity of the body, such as BMI, which is adjusted by height and body weight and can evaluate general adiposity but cannot differentiate between muscle and adipose tissue mass. In recent years, researchers have found that central obesity is more strongly associated with health status, so other measures have been proposed to evaluate abdomen adipose tissue including hip circumference (HC), waist circumference (WC), waist to hip ratio (WHR), waist height ratio (WHtR), a body shape index (ABSI),4 body adiposity index (BAI)5 and body roundness index (BRI).6 Some studies found that these indices were more strongly associated with metabolic abnormality than BMI.7,8 However, these indices can still not exactly differentiate visceral adipose tissue from subcutaneous adipose tissue, and for this reason, the visceral adiposity index (VAI)9 was introduced to evaluate the distribution of visceral adiposity. Some studies10,11 have reported that these adiposity indices can help to evaluate MS more accurately, including diabetes mellitus, hyperlipidemia, and hyperuricemias, especially for obese adults. In 2006, the lipid accumulation product (LAP)12 was introduced, which incorporated triglycerides (TG) and WC and was adjusted by gender, which was thought to offer a better evaluation of visceral adipose tissue and had a stronger association with metabolic status. Some studies13,14 reported that LAP was an efficient marker of MS in general adult populations. In 2015, the cardiometabolic index (CMI)15 was proposed as a new index to evaluate visceral obesity by using blood lipid parameters and WHtR. The CMI has been verified to be associated with a variety of metabolic diseases, and it also provides a higher predictive value for hyperuricemia in random populations compared to other traditional anthropometric indices.3 However, whether the CMI is associated with hyperuricemia in asymptomatic adults with normal BMI has not been reported to the best of our knowledge, and it is also unknown if the CMI provides higher predictive value for hyperuricemia compared to other anthropometric indices in asymptomatic adults with normal BMI. Therefore, we designed this cross-sectional study to compare the association between these anthropometric indices and hyperuricemia, which may provide a theoretical basis for management of asymptomatic hyperuricemia adults with normal BMI.

Materials and Methods


This study was a cross-sectional analysis. Participant inclusion criteria were ①asymptomatic adults over 18 years old; ②complete data available for anthropometric indices; ③complete laboratory data available for blood lipid and related biomarkers; ④according to the Chinese obesity BMI standard, the normal BMI range is:18.5≤BMI<24 Kg/m2. Exclusion criteria were ①current use of medicine for lowering serum uric acid (SUA) or regulating lipids; ②presence of clinical symptoms related to hyperuricemia; ③chronic kidney disease or impaired renal function; ④participants with malignancies; ⑤participants with cardiovascular events, autoimmune diseases which may affect the SUA level. The cross-sectional study was conducted during routine health check-up examinations on 374 consecutively enrolled participants from January 2021 to July 2021, and the clinical data were collected. The study protocol complies with the Declaration of Helsinki, and ethical approval was obtained from the second hospital of Hebei Medical University hospital ethics committee (approval No.2021-P019).

Anthropometric and Biochemical Measurements

The height and weight of participants were measured with electronic scales when barefoot wearing light clothes. WC and HC were measured by trained nurses with inelastic tape; the WC was measured at the middle level of the lower costal rib and top of the iliac crest, and HC was obtained at the point of maximum circumference of the buttocks. Blood pressure (systolic blood pressure and diastolic blood pressure) were measured via automatic blood pressure monitor (HEM-7132, Omron), every participant took twice with an interval of 5 minutes, and the mean value of the twice as the final value. The blood samples of participants were collected after more than 8 h of overnight fasting. Fasting plasma glucose (FPG), serum urea, serum creatinine (SCr), SUA, total cholesterol (TC), triglycerides (TG), high-density lipoprotein cholesterol (HDL-C) and low-density lipoprotein cholesterol (LDL-C) were measured by biochemical autoanalyzer (Beckman Coulter AU5800, Tokyo, Japan).

Definitions and Anthropometric Indices Calculations

Hyperuricemia diagnosis was SUA>420 μmol/L.16 Anthropometric indices were calculated by the following formulas: WHR=WC(cm)/HC(cm); WHtR=WC(cm)/Height(cm); ABSI=WC(cm)/[height(cm)]1/2*(BMI2)1/3; BAI=HC(cm)/H(m)2/3−18; BRI=364.2−365.5*[1−[(WC/2π)/(0.5*height)]2]1/2; VAI(males)=[WC(cm)/39.68+(1.88*BMI)]*[TG(mmol/L)/1.03]*[1.31/HDL-C(mmol/L)]; VAI(females)=[WC(cm)/36.58+(1.89*BMI)]*[TG(mmol/L)/0.81]*[1.52/HDL-C(mmol/L)]; CMI=TG/HDL-C*WHtR; LAP(females)=TG(mmol/L)*[W(cm)−58]; LAP(males)=TG(mmol/L)*[WC(cm)−65]. Sample size calculation in this test was based on the ability to detect the hyperuricemia at least of 0.75 (probability of type I error=0.01, power = 0.99).

Statistical Analysis

Categorical variables are presented as numbers (percentages; n, %) and were compared with the Chi-square (χ2) test. The normality of continuous variables was analyzed by the Kolmogorov–Smirnov test. Normally distributed continuous data are presented as means ± standard deviation ( ± s) or as medians with interquartile range (M, IQR) according to whether they conformed to a normal distribution. Parametric variables were analyzed using independent t tests, while nonparametric variables were analyzed using the Mann–Whitney U-test. The correlations between different anthropometric indices and SUA level were assessed using partial correlation analysis. The χ2 tests were used to compare the incidence among different quartiles of anthropometric indices. Logistic analysis was used to analyze the association between different anthropometric indices and hyperuricemia. A receiver operating characteristic (ROC) curve was built for each variable in a univariate manner, and optimal thresholds were determined based on the sensitivity and specificity. Statistical analyses were performed using SPSS software (version 25.0, IBM Corp., Armonk, NY, USA) and SAS software (Version 9.4, SAS Institute Inc., Cary, NC, USA). Statistical charts were drawn using GraphPad Prism software (version 8.0, GraphPad, Inc., La Jolla, CA, USA). Comparison of ROC curves were performed using MedCalc software (MedCalc Software Ltd., Ostend, Belgium). Statistical significance was set at p < 0.05.


Basic Characteristics of Participants

There were 374 participants enrolled in this study, including 144 men and 230 women, age range 21–80 years (41.55±12.70 years), BMI range 18.6–23.9 Kg/m2 (21.55±1.49 Kg/m2). The basic characteristics for all participants are summarized in Table 1. The prevalence of hyperuricemia in asymptomatic adults was 18.72% (70/374). Compared with participants with normal SUA levels, the participants with hyperuricemia had significantly higher levels of VAI, CMI, FPG, serum urea, SCr and TG, and significantly lower levels of HDL-C than normal SUA participants (all p <0.05). Differences in other anthropometric indices and biomarkers between the normal SUA and hyperuricemia group were not significant (all p >0.05).

Table 1 Basic Characteristics of the Participants

After controlling for age, partial correlation analysis found that LAP, VAI and CMI were positively correlated with SUA level (r=0.129, 0.165 and 0.425, respectively; all p<0.05). Other anthropometric indices were not significantly correlated with SUA level (p>0.05). Results of the partial correlation analysis between different anthropometric indices and SUA level are shown in Table 2.

Table 2 Partial Correlation Analysis of Different Anthropometric Indices and SUA Level

Table 3 show the incidence of hyperuricemia in quartiles of VAI, LAP and CMI scores. The incidence of hyperuricemia increased per quartile for the CMI, and the Chi-square test was significant (χ2=56.313, p<0.001) Figure 1.

Table 3 Incidence of Hyperuricemia in Quartiles of VAI, LAP and CMI

Figure 1 The incidence of hyperuricemia in per quartile for the CMI, and the Chi-square test results.

After fully adjusting for age, gender, BMI and select biochemical indicators in model 3, only CMI was significantly associated with hyperuricemia (p<0.05), while other anthropometric indices were without significant association with hyperuricemia (all p>0.05). Results are shown in Table 4.

Table 4 Logistic Regression Analysis for Association Between Anthropometric Indices and Hyperuricemia

The ROC curves of different anthropometric indices for hyperuricemia are shown in Table 5 and Figure 2. Among the anthropometric indices, the CMI had the best predictive value for hyperuricemia, with AUC of 0.777 (95% CI=0.719–0.835; p<0.001), with sensitivity of 57.1% and specificity of 84.2%; meanwhile, VAI had a relatively high AUC of 0.592 (95% CI=0.525–0.658; p<0.05), with sensitivity of 85.7% and specificity of 35.4%. The predictive values of ABSI, BAI, BRI and LAP were not statistically significant (all p>0.05). DeLong tests showed that the differences in AUC comparing CMI with LAP, VAI, ABSI, BAI and BRI were all significantly different (Z=4.361, 5.699, 5.696, 5.357, and 5.254, respectively; all p<0.0001).

Table 5 ROC Curve of Different Anthropometric Indices Predictive Value for Hyperuricemia

Figure 2 The predictive value of CMI and other anthropometric indices for hyperuricemia.


To the best of our knowledge, this is the first cross-sectional study comparing the association between different anthropometric indices and hyperuricemia in asymptomatic adults with normal BMI. The results showed that the CMI had a stronger positive relationship with hyperuricemia than did other anthropometric indices even after they were fully adjusted. This result should provide new ideas for the management of SUA levels in asymptomatic adults with normal BMI.

Some studies have confirmed that the increase in adiposity, especially visceral adiposity, has a positive association with hyperuricemia.3 So, such as ABSI, BAI and BRI new anthropometric had been proposed to distribute adipose tissue more precisely, and some studies reported that these indices have close relationship with hyperuricemia in the general population.17,18 Contrary to previous studies, we did not find any relationship between these indices and hyperuricemia in our study. The reason for these inconsistent results may be due to: ① participants from different region with different lifestyle and BMI. ② The BAI, ABSI and BRI cannot exactly distinguish subcutaneous adipose tissue from visceral adipose tissue, the effects of them on health-related risk factors are different.19,20

The new indicators of abdominal obesity (VAI, LAP and CMI), besides WC include lipid parameters (TG or TG/HDL-C) to better discriminate cardiometabolic risk and MS than traditional indices.21,22 Previous studies had indicated that TG/HDL-C was superior in identify MS than nonHDL-C based on multiethnic sample,23 and TG/HDL-C considered as a marker of insulin resistance (IR) even in normal-weight adults.24 So, both the CMI and VAI have close relationship with the IR—central component of MS, and oxidative stress/inflammation–the key features of MS. The oxidative stress can induce IR by impairing insulin signal transduction and causing adipokine dysregulation, in addition, it also can activates several serine-threonine kinase pathway, such as IKKβ/NF-κB and JNK, which leading to IR sensitive degradation and resulted to the MS finally.25 Many inflammatory mediators, particularly tumor necrosis factor-α (TNF-α), monocyte chemotactic protein-1 (MCP-1), C-reactive protein (CRP) and interleukins are upregulated in IR via serine phosphorylation of IRS-1 and it reduces GLUT-4 expression thus decreasing glucose entry into cells or inhibition of the IKKβ signaling pathway, which can improve insulin sensitivity.26

Some scholars have reported a positive correlation between VAI and hyperuricemia,27,28 and they argue that visceral adipose tissue increase not only produce large numbers of free fatty acids which accelerate purine and uric acid synthesis, but also can cause abnormalities in peroxisomal proliferator-activated receptor-γ, resistin, cytokines and inflammatory factors, which contribute to endocrine dysfunction of adipose tissue and finally result in IR cause hyperuricemia.29,30 But in recent years, many scholars found that the IR and hyperuricemia were mutual causal relationship, even sometimes the hyperuricemia prior the IR occurs, IR enhances renal urate reabsorption via stimulation of uric acid transporter 1 and/or the Na-dependent anion co-transporter in brush border membranes or the renal proximal tubule;31,32 and IR accelerates the rate of lipolysis and decreases adipose tissue lipoprotein lipase activity,33 which in turn causes hyperlipemia and the subsequent over-production of uric acid;34 on the contrary, the hyperuricemia can induce endothelial dysfunction and/or oxidative changes in adipocytes, which are typical stigmata of IR;35,36 In this study, VAI was associated with SUA level, but when fully adjusted for age, gender, BMI and biomarkers, the association with hyperuricemia disappeared. In addition, previous study37 found that LAP was positively associated with hyperuricemia. But contrary to our results, there was not association between the LAP and hyperuricemia. The reason for the difference between this study and previous studies27 may be related to the different participant populations with different lifestyle and inclusion criteria. In this study, all the participants had normal BMI, and there were only eight participants (7 women, 1 man) with central obesity, which was an important distinction from the previous studies.

The CMI is a new anthropometric index proposed by Wakabayashi and Daimon,15 which is calculated as the product of the TG/HDL-C ratio and WHtR and appears to be a good predictor of coronary artery disease as a central component of MS. Some researchers38 have pointed out that the TG/HDL-C ratio may reflect atherogenic small dense LDL-C particles and may be associated with IR and MS; and WHtR is a better discriminator of coronary heart disease and cardiovascular risk than WC and BMI. CMI incorporates the TG/HDL-C ratio and WHtR, and thus includes all the central components comprising the criteria of MS. In the present study, the CMI was found to be a unique anthropometric index associated with hyperuricemia, with the following possible underlying mechanisms. First, the TG/HDL-C ratio is more strongly associated with IR than with other indicators of lipid metabolism, and IR cause urate reabsorption, hyperlipemia and the subsequent over-production of uric acid.33,34 Secondly, elevated TG levels reflected in the CMI may cause more free fatty acids to be produced and utilized, and the synthesis of fatty acids in the liver is associated with the de novo synthesis of purines, which accelerate uric acid production.39,40 The last and possibly most important reason explaining the association between the CMI and hyperuricemia is that low HDL-C levels are independently associated with decreased eGFR and increased risk of renal impairment, which may result in decreased excretion of uric acid.41–43

This study has several limitations. First, the study was cross-sectional in design, which prevented us from investigating the causal association between CMI and SUA levels and the association between blood biomarkers, anthropometric indices, and the progression of hyperuricemia. Secondly, the sample size was small, and all the participants were enrolled from one urban region with similar lifestyles and eating habits, so our power to investigate deeper relationships or findings was limited. Thirdly, we did not stratify the participants by gender, and neither was the menopausal status of females, the difference in the consumption of foods with high purine content, alcohol and soft drink sweetened with fructose collected, which are the main modifiable variables related to hyperuricemia development.

In conclusion, the CMI showed a moderate positive association with hyperuricemia, and offered higher predictive values for hyperuricemia. CMI can be easily obtained in annual check-up examinations and can provide monitoring bioindicators for hyperuricemia management of asymptomatic populations with normal BMI.


Hyperuricemia is highly prevalent in asymptomatic population with normal BMI in China.

CMI was moderate positive association with serum uric acid level, was independently associated with hyperuricemia.

CMI can offer higher predictive values for hyperuricemia, which can easily obtain in check-up examinations.


We are grateful to Xing Guan, Yan-Feng Li for providing technical assistance.


The authors declare that they have no conflicts of interest.


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