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Adiposity Indicators as Cardio-Metabolic Risk Predictors in Adults from Country with High Burden of Obesity

Authors Kerkadi A, Suleman D, Abu Salah L, Lotfy C, Attieh G, Bawadi H, Shi Z

Received 15 November 2019

Accepted for publication 10 January 2020

Published 21 January 2020 Volume 2020:13 Pages 175—183

DOI https://doi.org/10.2147/DMSO.S238748

Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 2

Editor who approved publication: Dr Antonio Brunetti

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Abdelhamid Kerkadi, Dana Suleman, Lana Abu Salah, Christina Lotfy, Grace Attieh, Hiba Bawadi, Zumin Shi

Department of Human Nutrition, College of Health Sciences, QU-Health, Qatar University, Doha, Qatar

Correspondence: Abdelhamid Kerkadi Tel +974 4403 4806
Fax +974 4403 4801
Email [email protected]

Background: In Qatar more than 70% 0f the adults are overweight and obese. Different adiposity assessment methods have been proposed to identify individuals at cardio-metabolic risk.
Purpose: This study aimed to compare anthropometric indicators with Dual-energy X-ray absorptiometry (DXA) –derived adiposity indicators in predicting cardio-metabolic risk among Qatari adults.
Patients and Methods: A random sample of five hundred and fifty-eight (558) healthy Qatari adults (men and women) aged 20 to 50 years was obtained from Qatar Biobank survey data. Anthropometric data (weight, height, and waist circumference), the DXA-derived data, and cardio-metabolic (CM) risk parameters were analyzed. A Spearman partial correlation coefficient, Receiver Operating Characteristics (ROC) curve and an area under curve (AUC) were used to assess the predicting ability of adiposity indicators for CM risk factors.
Results: Adiposity indices (anthropometric and DXA) were significantly correlated with most of the CM indicators (r= − 0.292 to 0.486, p< 0.001). The AUC of waist to height ratio (WHtR) was significantly higher than that of body mass index (BMI) and waist circumference (WC) in the prediction of low high density lipoprotein (HDL) (AUC=0.65, AUC=0.59; AUC=0.64), high low density lipoprotein (LDL) (AUC=0.67; AUC=0.62; AUC=0.66), high cholesterol (AUC=0.66; AUC=0.63; AUC=0.63), and high Homeostatic Model Assessment- (HOMA) (AUC= 0.81; AUC= 0.78; AUC=0.78). Among DXA- parameters, trunk fat had the highest AUCs for total cholesterol (AUC= 0.64, CI=0.56, 0.73), triglycerides and glucose index (TyG) (AUC=0.69, CI=0.64, 0.74), and HOMA (AUC=0.78, CI= 0.73, 0.84).
Conclusion: Results of the present study show that adiposity indicators (WC and WHtR) are clinically valuable tools to identify individuals at risk of CVD compared to DXA–derived parameters, while DXA can provide more accurate estimates.

Keywords: Qatar Biobank, adiposity indices, cardiometabolic indicators, dual-energy x-ray absorptiometry

Background

The prevalence of obesity in Qatar is at an alarming rate. Results of the Stepwise survey conducted by the Supreme Council of Health (SCH) showed that the prevalence of overweight among Qatari was 28.7% (25.1% men and 32.2% women), and 41.1% were obese (43.2% men and 39.5% women).1 Several epidemiological studies have documented the strong association between obesity and the development of cardio-metabolic risks (CM) such as hypertension, insulin resistance, diabetes mellitus (T2DM), and dyslipidemia, which contribute to the development of cardiovascular diseases (CVD).2,3 The excess of adipose tissue is involved in the pathogenesis of hypertension, T2DM, and CVD.4,5 Elucidating the association between adiposity and CM risk factors is very important in the prevention of non-communicable diseases (NCD). Therefore, it is necessary to choose the ideal adiposity measure that can assist in predicting the development of diseases and identifying individuals at risk.

Several methods have been used in clinical practices to assess adiposity. Anthropometrics measurements, weight, height, BMI, WC, WHtR, and waist to hip ratio (WHR) have been used globally in researches. These methods are easy to adopt, inexpensive, and quick. Among these measures, BMI is the most used indicator of obesity, and has its limitations. BMI depends only on height and weight disregarding factors such as age, sex, ethnicity, and muscle mass.6 In addition, BMI does not take body fat distribution into consideration, which is an important factor as abdominal adiposity is strongly associated with high risk of CM diseases.7

Several studies reported that abdominal obesity, particularly, visceral obesity, is associated with a cluster of atherogenic metabolic abnormalities referred to as the metabolic syndrome.810 WC as a measure of central obesity was used, as an accurate indicator of CM risk compared to BMI.7 Different studies have revealed that WC is as effective as BMI because it does not take height into consideration and there can be under or over estimation of indicating CM risk in tall or short adults.11

However, anthropometric measures do not distinguish between either fat and lean mass or visceral fat tissue or subcutaneous adipose tissue within the abdomen.12 In order to overcome the weakness of anthropometric indices, a direct method was proposed to estimate body fat and fat distribution. DXA is considered as a gold standard to assess body composition. It is a valid technique for assessing body composition, as it is able to quantitate whole body and regional fat mass, lean mass, and bone mineral density.13 Its use in clinical practice and in research is limited as a result of its accessibility and cost.14,15 However, the selection of the best adiposity indices to predict CM risk is controversial. This research aim is to determine the best and most effective indicator in predicting high CM risk factors among Qatari adults.

Materials and Methods

Study Population

The study is a population based cross-sectional survey among Qatari adults (men and women) and long term residents (individuals living in the country for ≥ 15 years) aged ≥18 years. This study is within the framework of Qatar Biobank, which is the first Qatar national population based prospective cohort study that includes the collection of biological samples, with long-term storage of data and samples for future research.16 A random sample of eight hundred and ninety-two (892) Qatari adults (men and women) aged 20 to 50 years was obtained from Qatar Biobank survey data. Of those obtained, three hundred and thirty-four (334) were excluded because they were not involved in overnight fasting. Finally, a total of 558 participants were included in the present study. The totality of participants were not diagnosed with the following diseases diabetes, hypertension, dyslipidemia and cardiovascular diseases. They were not under any medical treatment that can affect cardiometabolic variables. All participants provided a written informed consent. The study was approved by the Institutional Review Board of Qatar Biobank. The identity of participants was not revealed, and an identification number was allocated to each participant and was used in whole data analysis.

Obesity Indicators: Anthropometric and DXA Derived Parameters

Trained staff in Qatar Biobank clinics using standard methods measured the anthropometric indicators. Body weight (kg) and height (cm) were measured in light clothing without shoes with a calibrated scale and a wall-mounted stadiometer. WC was determined at the midpoint between the last rib and the top of the iliac crest with stretch-resistant tape. BMI was calculated as weight (kg) divided by square of the height (m) waist to height ratio (WHtR) was calculated by dividing WC by height. Overall adiposity (total fat mass (g), total body fat (TBF%) and regional fat distribution (trunk, leg, android and gynoid fat mass (g) were performed with DEXA –Full body iDXA (GE) scan scanners. DXA derived parameters were used to calculate different ratios such as trunk/leg fat and android/gynoid fat ratio.

Data Collection

All measurements were performed by trained technicians and nurses at the Qatar Biobank clinic. Systolic and diastolic blood pressure (SBP and DBP) was determined in triplicate with the use of mercury sphygmomanometer, and the average of repeated measurements taken into analyses.

Blood samples were collected after overnight fasting and used to measure plasma glucose, glycated hemoglobin (HbA1C), high density lipoprotein cholesterol (HDL), insulin, and triglyceride levels using standard laboratory enzymatic methods. LDL was calculated using the Friedewald formula.17 TyG was calculated using the equation: Ln [TG (mg/dL) × glucose (mg/dL)/2.18,19 HOMA was calculated using the formula: fasting glucose 9mg/dL × fasting insulin (uU/mL)/405.20

Statistical Analysis

Data were analyzed using Statistical Package for the Social Sciences version 23 (SPSS Inc, Chicago). We used descriptive statistics with means and standard deviations (SD) for continuous variables or percentages for categorical variables to summarize characteristics of the study population. t -test and chi-square test (χ2) were used to compare body adiposity and CVD biomarkers between gender. Spearman partial correlation coefficient was used to evaluate the association between anthropometric, DXA, and CM risk parameters. ROC curves were conducted and the area under curve (AUC) was performed with a 95% confidence interval (95% CI) to assess the accuracy of adiposity indicators (trunk, legs, android, gynoid, trunk/leg, android/gynoid, %BF, total fat), and anthropometric indicators (BMI, WC, WHtR) for predicting abnormality of total cholesterol, LDL, HDL, TG, TC, HOMA, and TyG. Subjects at CM risks were identified according to the NCEP(ATP III) guidelines given as: SBP> 130 mmHg; DBP>85 mmHg; HDL< 1.04 mmol/L (male) and HDL<1.29 mmol/L (female);21 TG >1.7 mmol/L; LDL >3.5 mmol/L; TC>5.2 mmol/L; HbA1c≥6.1%; HOMA-IR ≥2.28,22 and TyG≥ 8.65.23

Results

Table 1 shows the anthropometric characteristics of the study population. Men and women in the sample were comparable in terms of mean age, BMI, WHtR, trunk fat, and android. Men had higher WC, total body fat, trunk fat to leg fat ratio, and android, while women had higher % body fat, trunk fat, legs fat and gynoid. The prevalence of general and abdominal obesity was significantly higher among women compared to men (28.6% vs 15.8% and 15.8% vs 7.7%), respectively.

Table 1 Anthropometric Characteristics of the Study Population

Table 2 shows the cardio-metabolic risk parameters. Results indicated that men had significantly greater mean SBP, DBP, LDL, TG, glucose, TyG index, and TG/HDL, while women had significantly higher mean of HDL, insulin and HOMA-IR. There were no significant differences in total cholesterol and HbA1C between men and women, respectively. The prevalence of participants with low HDL, high LDL, high TG, and HOMA-IR was not statistically different between men and women. The rate of participants with high TyG was significantly higher for women than men (11.6% vs 15.1%, P=0.002). The prevalence of prediabetes among total population was 3.3% and the highest rate was observed among men (2.2% vs 1.1%, p=0.022).

Table 2 Cardio-Metabolic Risk Parameters of the Study Population

Partial correlation coefficients between adiposity indices and CM risk parameters after adjusting for age and gender are presented in Table 3. In general, adiposity indices (anthropometric and DXA) were significantly correlated with most of the CM indicators (r= −0.292 to 0.486, p< 0.001). Within the anthropometric indices, BMI had the weakest correlation with most CM parameters except for LDL. WC was strongly correlated with all CM parameters except for LDL, SBP (r=0.311, P< 0.001), glucose (r=0.317, P< 0.001), and HDL (r=−0.266, P< 0.001). WC and WHtR had the highest correlation coefficients with HOMA and insulin (r= 0.483 and 0.481; r=0.4831 and 0.486, P< 0.001), respectively. A weak correlation between DBP, LDL and anthropometric indices was observed. Results of the DXA–derived indicators demonstrated that they were significantly correlated with all CM parameters (P< 0.001). High significant correlations were also observed between the android fat and SBP, and DBP. Trunk fat was significantly correlated to TG, glucose, LDL, HOMA, TyG, and insulin. Moreover, it was observed within the DXA-indicators, that the ratios of fatness (trunk/leg fat and android/gynoid fat) showed higher correlation with Hb1Ac and HDL as compared to the measures of specific fat areas (trunk fat, leg fat alone). In general, DXA-derived indicators were highly correlated with most CM indicators than anthropometric indicators.

Table 3 Partially Adjusted Correlations of the Different Adiposity Indicators with Cardiometabolic Risk Parameters

Figure 1 shows the AUC’s of anthropometric indices and DXA –derived indicators in the prediction of cardio-metabolic risk factors. Results demonstrated that the ability of adiposity indicators to identify CM risk varies, with AUCs ranging from 0.31 to 0.83. Among the anthropometric indices, the AUC of WHtR was significantly higher than that of BMI and WC in the prediction of low HDL, high LDL, high cholesterol, and high HOMA. WC had the highest AUC for TG. BMI had the lowest AUC for all CM risk factors. Among the DXA-derived indicators, fat percentage has the highest AUC to predict low HDL. Android to gynoid ratio has the highest AUCs for high LDL, high TG and high TyG. While trunk fat had the highest AUCs for total cholesterol, high HDL, and high HOMA. In general, anthropometric indices showed equally ability to predict abnormality for CM risk factors as DXA-derived indicators.

Figure 1 Adjusted area under the ROC curve for body adiposity indicators for predicting selected CM risk factors. Notes: The model used for analysis was adjusted for age and gender. The highest value for each CM risk is highlighted in bold. Abbreviations: AUC, Under area receiver operating characteristic (ROC) curve; CM, cardiometabolic; CI, confidence interval; BMI, Body mass index; TG, Triglycerides; HDL, High density lipoprotein cholesterol; LDL, low density lipoprotein cholesterol; HOMA, Homeostatic model assessment; TyG, triglycerides and glucose index.

Discussion

The present study is the first report on the CM risk associated with obesity indices using Qatar Biobank data. The objective of this study was to compare the ability of different obesity indicators (anthropometric indicators and DXA –derived parameters) to predict CM risk among Qatari adults.

Evidence from numerous studies demonstrated the association between adiposity and the risk of certain non-communicable diseases.2428 Different body adiposity indicators were associated with CM risk.12,2937

The major anthropometric indicators used to predict the CM risk include BMI, WHtR, and WC. BMI is the most widely used measure to diagnose overweight and obesity, whereas WC and WHtR better indicator of intra-abdominal fat, have been suggested to be more accurate to predict CM than BMI.24,25,27,3840

Results of the current study demonstrated a significant correlation between most of the anthropometric indicators of adiposity and CM risk parameters. The strongest associations were observed with WHtR and WC. This finding is in line with other studies.39,41 Konieczna et al reported a poor association between anthropometric indicators and CM risk parameters. Results of ROC analysis confirmed the superiority of WHtR and to a lesser degree WC based on the greatest AUC in predicting CM risk.12 Similar results have been reported by other studies.24,25,27,41 Recently, several meta-analysis have been published comparing BMI, WC and WHtR with BMI to elucidate their association with CM.38,42,43 In a meta-analysis, Ashwell et al reported the superiority of WHtR over WC and BMI for detecting CM risk factors in both sexes.38 Results from the CARRS study conducted in India and Pakistan revealed that WC and WHtR were the most useful indices for identifying South Asian adults with prevalent diabetes and hypertension.24

Results of a study targeting Arab adults indicated that WC and WHtR were strongly associated with SBP and DBP, respectively. They also reported a statistically significant association between WC, WHtR and glucose (r=0.34 and 0.33), respectively. The correlation coefficients of total cholesterol and LDL were 0.28, 0.24, 0.14 and 0.15 for WC and WHtR, respectively. Results revealed a weak association between WC, WHtR, and HDL (−0.06 and 0.006), respectively. Comparing WC and WHtR, AUC’s analysis have shown that WC was the most sensitive adiposity index for diabetes mellitus, CVD, hypertension and metabolic syndrome (AUC=0.6960, AUC=0.795; AUC= 0.589; AUC=0.813, respectively).4,12,15,44

The results are in line with other studies.4,12,15,45,46 It is well known that regional fat distribution is strongly associated with CM risk compared to total fat.47,48 Aparisi et al reported a high correlation between HDL and % total fat mass (r=−0.501) for only men, while for TG, the highest correlation was from the ratio trunk to leg fat mass for men (r=0.457) and women (r=0.421), respectively.45 Results of a study targeting postmenopausal women revealed that central adiposity indices (android fat, trunk fat, android/gynoid fat mass, trunk/leg fat mass) were significantly correlated with HOMA, TG, and inversely correlated with HDL.44

Wiklund et al reported on the association between abdominal and gynoid fat mass with CM risk factors. Results revealed a high significantly correlation between abdominal fat and TG for men (r=0.31) and women (r=0.33), respectively. The ratio abdominal to gynoid was highly correlated with cholesterol for men (r=0.32) and a weak correlation was noted for women (r=0.12). The highest correlation was observed for abdominal fat and DBP for men (r=0.34).15 Results of a cross sectional analysis revealed a statistically significant relationship between trunk/leg fat, Hb1Ac (r=0.118), TyG (r= 1.160), and TG (r=0.126). The correlation was negative with HDL (r= −0.132) and no significant correlations were observed between the DXA indices, SBP, DBP, and LDL.12

The effect of adipose tissue on the development of non–communicable diseases (NCD) such as cardiovascular diseases, hypertension, and diabetes mellitus (T2DM) is well established.4951 Identifying individuals and population at risk of NCD constitutes the health priority for clinicians and public health authorities. Different researches have been conducted to compare the accuracy of different body adiposity indices in predicting CM risks.2,33,52,53 Results of different studies comparing anthropometric indices with DXA-derived indicators to select the best adiposity indices to predict CM risk were controversial.

Results of this study indicated that DXA- derived measurements did not offer advantages over traditional anthropometric indicators in predicting CM risk. Abdominal obesity indicators (WC and WHtR) showed better ability to predict dyslipidemia (high cholesterol, high LDL), while DXA-derived parameters (BF% and trunk/leg fat) were more accurate to predict low HDL and high TG, respectively. Our results were consistent with previous studies.4,29,54 In a study aimed to compare DXA derived parameters with anthropometric measures to predict the abdominal aortic calcification (AAC), strong marker of atherosclerosis among elderly, Shang et al reported that WC and WHR were the best predictors of AAC severity among male and female.54

Another study conducted did not find any advantages using DXA, as a routine assessment tool, to identify CM risks associated with obesity.29 Results of a study comparing the association between adiposity measured by DXA, BMI and skinfolds and risk markers for CVD and diabetes in adult males, indicated that BMI was as performant as DXA parameters and skinfolds. Strongest correlations for BMI compared to DXA indicators were observed for HDL (R=−0.31, P< 0.001), TG (R=0.41, P< 0.001), SBP (R=0.31, P< 0.001), and DBP (R=0.31, P< 0.001), respectively.4

Controversial findings were reported in different studies. In a cross sectional analysis, Konieczna et al reported that DXA measures and regional adiposity were the strongest predictors of CM risks than conventional anthropometric measurements.12 Results of AUC’s analysis indicated that trunk/leg fat had the highest AUC for TG (AUC=0.556, 95% CI 0.523–0.589), HDL (AUC=0.556, 95% CI 0.523–0.588), and TG/HDL (AUC=0.581, 95% CI 0.546–0.617), respectively. A significant relationship was also observed between visceral adiposity (VAT) and Type 2 diabetes indicators. The highest AUC’s were observed for VAT/total fat and HbA1c (AUC=0.629, 95% CI 0.567–0.690), and VAT for Tyr (AUC=0.626, 95% CI 0.578–0.674).12 Vasan et al showed a strong association between android fat, visceral fat, impaired fasting glucose, and hypertriglyceridemia.55 The Odds ratio (ORs) for impaired fasting glucose, android fat, and visceral fat were (OR= 1.93, 95% CI 1.30, 2.88) and (OR= 1.69, 95% CI 1.36, 2.11), respectively. For hypertriglyceridemia, ORs were (OR=5.01, 95% CI 3.25, 7.69), and (OR=3.64, 95% CI 2.82, 4.70) for android fat and visceral fat, respectively.55

Wiklund et al studied the association between abdominal and gynoid fat mass with the CM risk factors among adults. It was concluded that abdominal fat and the ratio of abdominal to gynoid fat were better in predicting CM risks factors than BMI. We noted that this study compared DXA parameters only with BMI.15 Similar results have been reported by other researchers.45,46

The present study had some strengths and limitations. The Qatar Biobank data included all variables on biomarkers, DXA and anthropometric measurements. The study population was composed of homogenous and healthy individuals. This study is limited because the cross-sectional nature of the study does not allow causality between the study variables and the outcomes. Another limitation may be attributed to the relative low sample size.

Conclusions

Results of the present study show that adiposity indicators (WC and WHtR) are clinically valuable tools used to identify individuals at risk of CVD. The use of DXA can provide more in depth data.

Abbreviations

BMI, Body mass index; WC, Waist circumference; WHtR, Waist to height ratio; CM, Cardiometabolic; TG, Triglycerides; LDL, Low density liporotein; HDL, High density lipoprotein; CVD, Cardiovascular diseases; ROC, Receiver operating characteristics; AUC, Area under curve; TyG, Triglycerides and glucose index; DXA, Dual-energy x-ray absorptiometry; HOMA-IR, HOMA- Homeostatic Model Assessment- Insulin resistance; DBP, Diastolic blood pressure; SBP, Systolic blood pressure.

Ethics Approval

The study was approved by the Institutional Review Board of Qatar Biobank (Ex-2018-RES-ACC-0117-0059).

Data Sharing Statement

The datasets generated and/or analyzed during the current study are not publicly available due Qatar Biobank policy but are available from the corresponding author on reasonable request.

Acknowledgment

The authors would like to thank Qatar Biobank for providing the data.

Author Contributions

All authors contributed to data analysis, drafting and revising the manuscript. All authors approved the final version to be published, and agree to be accountable for all aspects of the work.

Disclosure

The authors declare that they have no competing interests in this work.

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