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Gender differences in the ideal cutoffs of visceral fat area for predicting MAFLD in China

Abstract

Background

Since the discovery of metabolic-associated fatty liver disease (MAFLD) in 2020, no report on the connection between the visceral fat area (VFA) and MAFLD has been published in China, and the ideal cutoffs of VFA for predicting MAFLD has not been determined so far. Thus, the purpose of this research was to clarify the relationship between VFA and MAFLD and the ideal cutoffs of VFA to predict MAFLD in the Chinese population.

Methods

Five thousand three hundred forty subjects were included in this research, with 30% randomly selected for the validation set (n = 1602) and 70% for the Training set (n = 3738). The association between VFA and MAFLD was determined by multiple logistic regression. ROC curves were used to evaluate the prediction effect of VFA on MAFLD.

Results

Multiple logistic regression analysis revealed that the VFA ORs (95% CIs) were 1.25 (1.20, 1.29) for women and 1.15 (1.12, 1.17) for men. Meanwhile, the VFA quartile OR (95% CI) were 3.07 (1.64, 5.75), 7.22 (3.97, 13.14), 18.91 (10.30, 34.71) for women and 3.07 (1.64, 5.75), 7.22 (3.97, 13.14),18.91 (10.30, 34.71) for men in the Q2, Q3, and Q4 groups compared with Q1. The ROC curve showed the VFA, WC, WHR, and WHtR to predict MAFLD, the AUC value of VFA was the highest and the prediction effect was the best. The ideal cutoffs of VFA to predict MAFLD was 115.55 cm2 for women and 178.35 cm2 for men, and the AUC was 0.788 and 0.795, respectively. Finally, the AUC was 0.773 for women and 0.800 for men in the validation set.

Conclusion

VFA was an independent predictive factor for MAFLD, and the ideal cutoff of VFA to predict MAFLD was 115.55 cm2 in women and 178.35 cm2 in men.

Introduction

With improvements in living standards and changes in dietary structure and lifestyle, the prevalence and incidence of MAFLD associated with obesity/overweight, metabolic disorders, and type 2 diabetes (T2DM) have dramatically increased. Notably, the increased prevalence of MAFLD resulted in increased mortality from decompensated liver cirrhosis, hepatocellular carcinoma, and hepatic-related diseases [1, 2]. It is well documented that MAFLD can promote the development of cardiovascular and cerebrovascular diseases [3, 4], chronic kidney disease [5], ovarian syndrome[6], and malignant tumors (such as liver cancer, colorectal adenoma/adenocarcinoma, breast cancer, and lung adenocarcinoma) [7,8,9,10], seriously endangering human health and imposing a huge economic burden on society. MAFLD typically has an insidious onset and slow progression; the majority of patients manifest no obvious clinical symptoms or discomfort, which is easily overlooked. Therefore, it is crucial to find an early and non-invasive method for evaluation for MAFLD.

Abdominal obesity is considered to be one of the major risk factors for fatty liver. Quantitative indicators of abdominal obesity include visceral fat area (VFA), waist circumference (WC), waist-to-hip ratio (WHR), and waist-to-height ratio (WHtR) [1]. WC is currently recognized as the simplest and most practical index for measuring abdominal obesity [2]. WHR is the ratio of waist circumference to hip circumference and is an important indicator for determining central obesity. WHtR is the ratio of waist to height, which can reflect the accumulation of visceral fat. These indexes can't quantitatively reflect the degree of accumulation of abdominal. However, VFA is an accurate and reproducible indicator of abdominal obesity [11, 12], and it is a gold standard for the diagnosis of abdominal obesity, and it can accurately and visually reflect the accumulation of visceral fat and the distribution of fat [3]. Indeed, there is substantial evidence that VFA is closely related to T2DM [13], metabolic syndrome (MS) [14], and cardiovascular disease [15, 16]. Moreover, VFA is an independent risk factor for steatohepatitis with a dose–response relationship to its risk [17]. Excessive accumulation of visceral fat can increase fat deposition in the liver, promote the synthesis of triglycerides, release more free fatty acids into the blood, interfere with glucose metabolism, and lead to lipid metabolism disorders and insulin resistance, thereby promoting the formation of fatty liver [18, 19]. The accumulation of visceral fat may reduce adiponectin levels and release other inflammatory factors, triggering a series of metabolic disorders such as insulin resistance, inflammation, and fatty liver [20, 21]. Visceral adipose tissue can promote the secretion of large amounts of inflammatory cytokines for release, triggering inflammatory responses and oxidative stress, leading to increased expression of TNF-α, IL-1, IL-6, and other inflammatory cytokines, which contribute to accelerated liver damage and more rapid progression of fatty liver disease [22,23,24,25]. Therefore, measuring VFA is essential for evaluating patients with MAFLD.

Since MAFLD was proposed in 2020, there has been no report on the relationship between VFA and MAFLD, and the ideal cutoffs of VFA for predicting MAFLD have not been established in the Chinese population. In contrast, the VFA in the prediction of T2DM [13], cardiometabolic diseases [26], gastric cancer [27], and metabolic syndrome [28] have been established, and based on the results of previous studies, the cutoffs of VFA prediction for various diseases are also completely different. In addition, MAFLD varies significantly by gender, and its pathophysiological mechanisms are affected by gender and fat distribution [29], and thus, ignoring gender-specific analysis may mask crucial findings. Therefore, in this study, the VFA was taken as the breakthrough point to search for the association between VFA and MAFLD, and determine the ideal cutoffs of VFA to predict MAFLD in different genders.

Materials and methods

Study participants

This study collected people aged ≥ 18 years with QCT from July 1, 2020 to March 31, 2022 as research subjects. Exclusion criteria: (1) Incomplete or missing baseline data; (2) severe cardiac, hepatic, or renal insufficiency and (3) malignancy. To preserve the privacy of participants, untraceable codes were used to encode their identifiable information. The research was approved as Clinical Trial 2020 (261) by the Ethics Committee of the Second Affiliated Hospital of Chongqing Medical University, and all subjects signed an informed consent form.

Laboratory and imaging evaluation

According to previous studies, risk factors affecting fatty liver were selected as covariates. The medical history included a history of hypertension, diabetes, smoking (with and without), alcohol consumption (no drinking, light drinking as defined as alcohol consumption < 140 g/week for men and < 70 g/week for women, and heavy drinking as defined as alcohol consumption ≥ 140 g/week for men and ≥ 70 g/week for women), and exercise (no exercise, 3 days/week or less, 3 days/week or more, and 30–60 min/day of moderate intensity exercise). The Omron body scale was used to check height and weight, Omron blood pressure monitor was used to measure systolic, diastolic, and heart rate. Blood tests included the levels of liver enzyme (γ-glutamyl transferase (GGT), albumin (ALB), 5 '- nucleosidase (5-NT), alanine aminotransferase (ALT), aspartic acid Aminotransferase (AST),) blood lipids (low-density lipoprotein-cholesterol (LDL-C), total cholesterol (TC), triglycerides (TG), and high-density lipoprotein-cholesterol (HDL-C)), renal function ((uric acid (UA), blood urea nitrogen (BUN), and serum creatinine (SCr)), fasting blood glucose (FPG), blood cell count ( platelet (PLT), white blood cell (WBC), and hemoglobin (HGB)), and HbA1c were measured with Hitachi automatic biochemical analyzer. Liver fat content (LFC) and VFA were measured using Quantitative Computed Tomography (QCT), a 64-slice CT scanner (model: SOMATOM go. Top) from Germany’s Siemens (the fourth-generation solid cylindrical membrane and image analysis system (QCT Pro 6.1) from Midways) was used, and scanning and computational processes were performed as described by Guo et al. [30].

Diagnosis of MAFLD

As outlined by an international consensus statement of experts on the new definition of MAFLD, the diagnostic criteria were based on LFC ≥ 5% using QCT combined with one of the following three conditions: T2DM, BMI < 23 kg/m2 with ≥ 2 metabolic parameters, and overweight or obesity (defined as BMI ≥ 23 kg/m2 for the Asian population) [1]. Presence of at least two risk factors for metabolic abnormalities, including (1) Blood pressure ≥ 130/85 mmHg or under antihypertensive treatment; (2)Waist circumference (WC): men ≥ 90 cm and women ≥ 80 cm; (3) TG levels ≥ 1.70 mmol/L or under lipid-lowering therapy; (4) HDL-C levels < 1.0 mmol/L for men and < 1.3 mmol/L for women or on lipid-lowering therapy; (5) Pre-diabetes, FPG of 5.6 ~ 6.9 mmol/L or HbA1c of 5.7 ~ 6.4%. HOMA-IR and C-reactive protein levels were not determined.

Statistical analysis

Software packages R and EmpowerStats were used for data statistics and analysis for this study. Continuous variables are described by mean ± standard deviation (SD), categorical variables are expressed as percentages, The independent sample rank-sum test (Mann–Whitney test) was used for comparison between two groups of data with non-normal distribution, and independent samples T-test was used for comparison between two groups of data with normal distribution. Variables with variance inflation factor (VIF) values ≥ 5 were excluded by the independent variable collinearity stepwise screening method. Multiple logistic regression was used to clarify the relationship between VFA and MAFLD, and the receiver operating characteristics (ROC) curve was used to verify the predictive ability of VFA on MAFLD.

Results

Baseline characteristics of the study participants in the training set according to gender

A total of 6024 subjects were included, of whom 560 did not fill out the questionnaire, 84 had missing BMI data, and 40 had malignant tumors. Initially, 5340 subjects were included, and 30% of the subjects were randomly sampled as the internal validation set, with 3,738 subjects and 1,602 subjects in the training and the validation sets, respectively. (Fig. 1 Study flowchart). There was no statistical difference between the training set and validation set for all variables (Supplementary Table 1).

Fig. 1
figure 1

Study flowchart

In the training set, the prevalence of MAFLD was 36.44% in women and 56.87% in men, and the prevalence of men is significantly higher than in women (χ2 = 154.39, P < 0.001). In the baseline data, women are older (P = 0.02) and have higher TC levels (P < 0.001)compared with men. While men had poorer metabolism, including higher BMI, higher blood pressure, higher WC, higher FPG levels, higher HbA1C levels, dyslipidemia (higher TG, lower HDL-C), higher UA levels, higher BUN levels, higher SCr levels, higher serum liver enzyme levels (GGT, ALT, AST), higher HGb, higher PLT, higher WBC, higher LFC, excess VFA, the above variables have statistical differences (P < 0.001). Men had higher proportions of hypertensive patients (χ2 = 5.49, P = 0.02), higher proportions of diabetics patients (χ2 = 30.50, P < 0.001), higher proportions of smokers (χ2 = 857.07, P < 0.001), and higher proportions of alcohol consumers (χ2 = 927.93, P < 0.001). There were no statistical differences in LDL-C levels, 5-NT levels, and physical activity between the two groups in the training set (Table 1) .

Table 1 Baseline characteristics of study populations by gender in the training set

Comparing differences in clinical parameters between Non-MAFLD and MAFLD groups of different genders

In the training set, patients with MAFLD were older, had higher BMI, higher WC, higher serum liver enzyme levels (GGT, ALT, AST, 5NT), higher UA levels, higher TG levels, lower HDL-C levels, higher FPG levels, and HbA1C levels, higher WBC levels, higher LFC, higher VFA compared with non-MAFLD groups in men and women, the above variables have statistical differences (P < 0.05). At the same time, patients with MAFLD had higher proportions of hypertension patients (χ2 = 125.44, P < 0.001; χ2 = 39.35, P < 0.001) and higher proportions of diabetes patients (χ2 = 47.21, P < 0.001; χ2 = 27.03, P < 0.001) compared with Non-MAFLD groups in men and women. Moreover, MAFLD had higher PLT (P < 0.001), higher ALB (P = 0.044), and higher BUN (P = 0.006) in women, but the difference was not statistically significant in men. Patients with MAFLD had higher LDL-C (P = 0.043) and HB (P = 0.001) in men, while there was no statistical difference in women. There was no statistical difference in SCr levels, TC levels, smoking and drinking, and physical activity between non-MAFLD and MAFLD groups in men and women (Table 2).

Table 2 Compare the differences in clinical parameters of Non-MAFLD and MAFLD in different gender

VFA is an independent risk factor for MAFLD

Multiple logistic regression was used to clarify the correlation between VFA and MAFLD in different models (Table 3). Variables WC and TC were excluded by independent variable collinearity stepwise screening. Multiple logistic regression analysis showed an ORs (95% CIs) of 1.27 (1.24 − 1.30), 1.25 (1.21 − 1.28), 1.25 (1.20 − 1.29) for women and 1.16 (1.15 − 1.18), 1.16 (1.15–1.18), 1.15 (1.12–1.17) for men in the unadjusted, minimally adjusted, and fully adjusted models, respectively. After adjusting for confounders, quartile analysis of VFA to clarify the relationship between VFA and MAFLD, and found that the ORs (95% CIs) of MAFLD risk in groups Q2, Q3, and Q4 compared with the lowest VFA group (Q1) was 3.77 (2.77- 5.14), 7.83 (5.20–11.79), and 21.23 (8.16–55.25) for women and 3.07 (1.64–5.75), 7.22 (3.97–13.14), 18.91 (10.30–34.71) for men in the fully adjusted model, respectively. The risk of MAFLD increased with increasing VFA, with a trend test P value of < 0.001, suggesting a statistically significant increase.

Table 3 Relationship between VFA and MAFLD in different models by multiple logistic regression

Comparison of VFA, WC, WHtR, and WHR for predicting MAFLD risk

The ROC curve shows that VFA, WC, WHtR, and WHR predict MAFLD in different genders (Fig. 2). The AUC(95CI) of VFA, WC, WHR, and WHtR in women is 0.788 (0.766–0.810), 0.775 (0.752–0.798), 0.721 (0.696–0.747) and 0.774 (0.751–0.797), respectively; The AUC(95CI) of VFA, WC, WHR and WHtR in men is 0.795 (0.777–0.814), 0.785 (0.766–0.804), 0.694 (0.671–0.717) and 0.744 (0.723–0.766), respectively; The AUC values of VFA, WC, and WHTR variables were greater than 0.7, indicating that VFA, WC, and WHTR had certain predictive value for MAFLD risk in different genders, among which VFA has the largest AUC and the greatest predictive value for MAFLD.

Fig. 2
figure 2

The ROC curves for VFA, WC, WHR, and WHtR for predicting MAFLD risk for men and women

The ideal cutoffs of VFA for the prediction of MAFLD risk

ROC curves were used to assess the ability of VFA to predict MAFLD and the ideal cutoffs of VFA for predicting MAFLD in different genders. The results demonstrated that the AUC (95% CI) of VFAs was 0.788 (0.766–0.81) in women and 0.795 (0.777 -0.814) in men. The specificity and sensitivity of VFA in predicting MAFLD were 0.760 and 0.678 in women, and 0.644 and 0.772 in men, respectively. Furthermore, the ideal cutoff of VFA was 115.55 cm2 for women and 178.55 cm2 for men (Fig. 3A). As expected, there was a significant gender difference in the cutoffs of VFA for predicting MAFLD, and men had higher cutoffs in VFA than women. The violin chart reflects the distribution and probability density of the different gender of VFA for patients with and without MAFLD in the training and validation sets (Figs. 3B, C). The results showed that the AUCs of VFAs were 0.788 and 0.773 for women and 0.795 and 0.800 for men in the training set and validation set, respectively. (Figs. 3D, E). VFA could accurately predict the risk of MAFLD, thus providing a clinical basis for the prevention and treatment of MAFLD patients.

Fig. 3
figure 3

Receiver operating characteristic curve of VFA for predicting incident MAFLD in women and men A. The violin chart reflects the distribution and probability density of different genders of VFA for participants with and without MAFLD in the training set and validation set B, C. The ROC curve was used for risk prediction evaluation in the training and validation sets D, E. AUC, area under the curve; CI, confidence interval

Discussion

The results of this study signaled that the MAFLD population was older, with higher liver enzymes, poorer metabolism, higher LFC, and higher VFA than non-MAFLD. Regression analysis showed that VFA was an independent predictor of MAFLD, and its risk increases with increasing VFA quartiles. The ROC curve showed the VFA, WC, WHR, and WHtR to predict MAFLD in different genders, the results showed that VFA is a better predictor of MAFLD risk than WC, WHR, and WHtR. Interestingly, the study found a significant difference in gender in the VFA prediction of MAFLD risk, the ideal cutoffs of VFA were 115.55 cm2 for women and 178.35 cm2 for men. Further through internal validation, the results showed that the AUC of the VFA was very close and the AUC was greater than 0.75 in the validation and training sets, which implies that the VFA has good distinguishing ability and accuracy in predicting MAFLD risks.

This study highlights the importance of VFA for the risk assessment of MAFLD. Although the status of BMI and WC in risk prediction has been established. BMI is affected by bones and muscle, cannot reflect the fat content and body fat distribution, and cannot effectively reflect the abdominal and visceral fat accumulation. Individuals with normal or low BMI may have visceral fat accumulation. WC cannot distinguish visceral fat from subcutaneous fat and is influenced by height [31], and thus it cannot accurately predict the risk of MAFLD. In recent years, the role of VFA in a variety of chronic diseases has attracted attention. VFA is considered a more precise indicator of abdominal obesity and metabolic risk factors than BMI and WC [28]. Studies have established that VFA is closely related to the severity of hepatic steatosis [32] and is also a strong predictor of NAFLD [33]. Compared with subcutaneous fat, VFA was more closely related to metabolic abnormalities [34]. Therefore, VFA can become an essential indicator for predicting the risk of MAFLD.

Obesity and abdominal obesity defined by BMI and WC have different cutoffs in different races and regions, and the cutoffs of VFA to predict different diseases also differ. A study has shown that VFA is closely related to MS, and the ideal cutoff for VFA was 81.1 cm2 of women and 84.7 cm2 of men to predict MS in T2DM [35]. 4.8-year follow-up result showed that VFA was an independent predictor for T2DM, the prediction of T2DM with VFA ≥ 130 cm2 in men and ≥ 85 cm2 in women in South Korea [13]. Likewise, another study determined that the ideal cutoffs for VFA were 120 cm2 of men and 80 cm2 of women to predict T2DM in South Korea [36], the VFA for predicting T2DM in the above two studies is different, which may be attributed to different included populations and independent variables. Meanwhile, the VFA was 134.6 cm2 in men and 91.1 cm2 in women to predict MS in Korean adults [28]. A Turkish study has shown that pancreatic steatosis is associated with high VFA, VFA ≥ 107.2 cm2 could predict pancreatic steatosis [37].

Recent studies have demonstrated that the cutoffs of VFA for predicting NAFLD or MAFLD are significantly different among different ethnic groups and regions. In a study in Taiwan, the ideal cutoff for VFA to predict NAFLD was 70.5 cm2 [33]. In another study, the ideal cutoffs for VAR predicted NAFLD to be 3.469 for men and 6.357 for women in Tianjin [38]. Studies have demonstrated that decreased muscle mass and increased visceral fat exacerbate the increased risk of NAFLD in Japan [39]. Cho et al. study described that the low-grade skeletal muscle mass to visible fat area ratio was an independent risk factor for NAFLD in Korean [40]. Another study in South Korea showed that the ideal cutoffs for VFA to identify with lean NAFLD was 50.2 cm2 for men and 40.5 cm2 for women and to identify with overweight or obese NAFLD was 100.6 cm2 for men and 68.0 cm2 for women [41]. Sogabe et al. compared gender differences in alcohol consumption and abdominal fat between NAFLD and MAFLD in the Japanese population and evinced that the cutoffs for VFA to identify NAFLD and MAFLD were 108.1 ± 34.1 and 140.7 ± 46.0 for men, and 96.4 ± 27.8 and 120.8 ± 42.7 for women, respectively, the diagnostic criteria for NAFLD and MAFLD are different, and the cutoffs for VFA to predict NAFLD and MAFLD are different, this study also validated this point [42]. The prevalence and severity of fatty liver vary significantly among populations, and these differences can be attributed to several factors, including region, ethnicity, lifestyle, metabolic complications, and environmental and genetic epigenetic factors [43,44,45,46,47]. The new MAFLD definition has been endorsed by more than 1000 signatories from 134 countries and is advocated, given that it more accurately reflects the potential pathogenesis than NAFLD [48]. Therefore, the application of the definition and diagnostic criteria of MAFLD in this study is more conducive to the intervention and management of fatty liver.

Strength and study limitations

To the best of our knowledge, this is the first time that VFA is an independent predictor of MAFLD, and the ideal cutoffs of VFA to predict the risk of MAFLD are determined in the Chinese population. The results of this study revealed that there are gender-specific at the ideal cutoffs of VFA for predicting the risk of MAFLD, which can facilitate its early diagnosis and treatment. However, this study has several limitations. To begin, considering that this was a single-center, cross-sectional study, the results may not be generalizable to a global population. Secondly, observational studies can only prove an association between VFA and MAFLD risk but cannot provide definitive conclusions about causality. Thirdly, subgroup analysis was not performed herein. Therefore, large-scale, multi-center studies should be conducted in the future to analyze the relationship between VFA and MAFLD in different subgroups according to BMI, diagnostic criteria of MAFLD, HBV infection, alcohol consumption, and metabolism.

To conclude, this is the first time that VFA is an independent predictor of MAFLD in China. There was a significant gender difference in the ideal cutoffs for VFA to predict MAFLD risk, which was 115.55 cm2 for women and 178.55 cm2 for men. Therefore, regular testing of VFAs is strongly recommended for the early prediction of the risk of MAFLD to better guide lifestyle interventions and health management.

Availability of data and materials

The datasets generated and analyzed in this study are available from Dr. Pingping Yu upon reasonable request.

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Funding

This work is supported by the Chongqing Talents Project [cstc2021ycjh-bgzxm0150] and the Chongqing Science and Technology Commission Joint Medical Project [2021MSXM057].

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Authors

Contributions

Study design and project administration: Peng Hu and Ying Mei. Data analysis, writing – original draft and formal analysis: Pingping Yu. Data analysis and methodology: Huachao Yang. Data curation and supervision: Xiaoya Qi and Jianping Gong. Writing – review: Ruixue Bai. Data collection and data visualization: Shouqin Zhang. All authors reviewed and approved the manuscript.

Corresponding authors

Correspondence to Ying Mei or Peng Hu.

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Ethics approval and consent to participate

This study was approved by the Ethics Committee of the Second Hospital of Chongqing Medical University as Clinical Trial 2020 (261), and all subjects signed an informed consent form.

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Not applicable.

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The authors declare that no conflict of interest existed.

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Supplementary Information

Additional file 1:

Supplementary Table 1. Comparison of baseline clinical data for patients in the training set and validation set.

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Yu, P., Yang, H., Qi, X. et al. Gender differences in the ideal cutoffs of visceral fat area for predicting MAFLD in China. Lipids Health Dis 21, 148 (2022). https://doi.org/10.1186/s12944-022-01763-2

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Keywords

  • Metabolic-associated fatty liver disease (MAFLD)
  • Visceral fat area (VFA)
  • Quantitative Computed Tomography (QCT)