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Which anthropometric and metabolic index is superior in hypertension prediction among overweight/obese adults?

Authors Abolhasani M, Maghbouli N , Karbalai Saleh S , Aghsaeifar Z, Sazgara F, Tahmasebi M, Ashraf H, Haidar Ali J 

Received 24 September 2021

Accepted for publication 14 October 2021

Published 8 November 2021 Volume 2021:14 Pages 153—161

DOI https://doi.org/10.2147/IBPC.S340664

Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 2

Editor who approved publication: Dr Konstantinos Tziomalos



Maryam Abolhasani,1,* Nastaran Maghbouli,2,* Shahrokh Karbalai Saleh,3 Ziba Aghsaeifar,4 Faeze Sazgara,5 Maryam Tahmasebi,6 Haleh Ashraf,7 Jemal Haidar Ali8,*

1Cardiac Primary Prevention Research Center (CPPRC), Tehran Heart Center, Tehran University of Medical Sciences, Tehran, Iran; 2Physical Medicine and Rehabilitation Department, Tehran University of Medical Sciences, Tehran, Iran; 3Department of Cardiology, Sina Hospital, Tehran University of Medical Sciences, Tehran, Iran; 4Department of Internal Medicine, Sina Hospital, Tehran University of Medical Sciences, Tehran, Iran; 5Department of Radiology, Guilan University of Medical Sciences, Rasht, Guilan, Iran; 6Department of Cardiology, Amir Al Momenin Hospital, Islamic Azad University of Medical Sciences, Tehran, Iran; 7Cardiac Primary Prevention Research Center (CPPRC), Tehran Heart Center and Research Development Center, Sina Hospital, Tehran University of Medical Sciences, Tehran, Iran; 8Department of Public Health Nutrition, School of Public Health, College of Health Sciences, Addis Ababa University, Addis Ababa, Ethiopia

*These authors contributed equally to this work

Correspondence: Jemal Haidar Ali
Addis Ababa University, College of Health Sciences, School of Public Health, Department of Public Health Nutrition, P.O. Box: 27285, Addis Ababa, 1000, Ethiopia
Tel +251 115547465
; +251 911505465
Email [email protected]
Haleh Ashraf
Research Development Center, Sina Hospital, Emam Khomeini St., Tehran, 1136746911, Iran
Fax +98 21-66348553
Email [email protected]

Background: Although the effectiveness of some combined anthropometric and metabolic scores were evaluated in hypertension prediction, none of them had addressed their accuracy in association with overweight/obese populations. This study examined the accuracy of several anthropometric parameters in this regard and compared the novel indices to the ancient ones.
Methods: Through a cross-sectional study, 5115 patients have been evaluated at the weight loss clinic. Data on demographic information, anthropometric indices, and biochemical measurements were assembled into a checklist. Multivariable regression modeling and the area under the receiver-operating characteristic (ROC) were analyzed using SPSS version 20. To find new combined scores, SEM (structural equation modeling) analysis was also adopted. P-values < 0.05 were considered statistically significant.
Results: Considering ancient indices, WHtR (waist-to-height ratio) showed a sufficient area under the curve in predicting hypertension among both genders concomitant with WC (waist circumference) in men, and BRI (body roundness index) in women as highest AUC. The highest odds ratio (OR) for the presence of hypertension, based on the age-adjusted model, was BRI in females (OR, 3.335; 95% confidence interval [CI], 1.58– 7.28) and WC in males (OR, 13.478; 95% CI: 1.99– 45.02). The combined scores were not superior to the single ones.
Conclusion: The most powerful association between hypertension and sufficient discrimination ability of normotensives from hypertensive patients was detected for BRI in women and WC among men. However, neither the BSI and BAI nor FMI and FFMI showed superiority to WC or WHtR in predicting the presence of hypertension.

Keywords: prediction, hypertension, obesity, anthropometric indices, novel indices, Iran

Introduction

Obesity has become a major unsolved problem worldwide because of its proven risk for developing cardiovascular disease and its metabolic adverse effects in addition to its role in some cancers.1 Globally, the proportion of overweight/obese adults has increased to 36/9% in men and 29/8% in women,2 while 51/2% for men and 57/5% for women in Iran.3 Based on a systematic review, between 0.7% and 2.8% of a country’s total health-related budget was devoted to obesity. Furthermore, studies showed that medical costs for obese people were 30% greater than the normal weight population.4

Consequences of obesity are not only related to the degree of obesity but are also associated with the pattern of body fat distribution or fat to lean body mass proportion.5–7 A growing body of evidence has assessed the relationship of types/grades of obesity with hypertension (HTN) and found significant correlations.8–10 Mechanisms of obesity-related HTN following increased sodium reabsorption in kidneys include the role of renal sympathetic nervous system, kidney compression by visceral fat, and increased anti-natriuretic hormones and adipokines levels.11 Interestingly, the role of insulin resistance as a stimulating factor for other mechanisms in HTN was introduced recently.12

Other than the ancient anthropometric indices such as body mass index (BMI), waist circumference (WC), waist-to-hip ratio (WHR) and waist-to-height ratio (WHtR),13,14 there is a new index referred as Visceral Adiposity Index (VAI). This index is sex-specific, reflects the level of tissue resistance to insulin and adipose tissue mass15 and has a positive association with the risk of developing HTN.16

In 2011, Lipid Accumulation Product (LAP) index which describes lipid accumulation using WC and triglyceride (TG) concentrations, is reported to be a better index in predicting HTN compared to BMI and WC based on a study conducted among Mongolians in China.17

Another newly developed index known as Body Shape Index (BSI), showed superiority over BMI and WC for predicting HTN18 though Chang et al rebuffed this theory and instead came up with another better predicting index for HTN called Body Round Index (BRI) than BSI, BMI and WC.19

Body Adiposity Index (BAI), directly calculates the percentage of adiposity by using hip circumference and height.20 In some studies, BAI, when compared with BMI and WHtR, was not a better predictor for coronary vascular disease (CVD) risk factors;21,22 on the contrary, another study with a longitudinal study, showed BAI to predict incidence of HTN more precisely than BMI and WHR23 showing some inconsistencies in the anthropometric indices used deserves further study.

The Influence of lean body mass index versus that of fat mass index on blood pressure of Gujarati in-school adolescents studied in 2014 displayed a positive relationship between HTN and fat mass index (FMI) and also the free fat mass index (FFMI).24 Contrary to the Gujarati study findings, Stephen et al documented BMI as a stronger predictor than FMI and FFMI for developing HTN.25

Considering the lack of existing studies on the evaluation of newly developed anthropometric indices in Asia beyond China, the importance of ethnicity on obesity indices, and the controversial findings reported by some previous investigators on the superiority of adiposity indices that predict HTN, we examined the accuracy of several anthropometric parameters in this regard and compared the novel indices to the ancient ones in predicting hypertension among overweight/obese Iranian adults. Secondly, we reported some new potential combined scores in predicting hypertension contextually.

Methods

Study Design

This study employed a cross-sectional design, implemented at the obesity clinic of Sina Hospital, a referral hospital of Tehran University of Medical Sciences.

Study Participants

A total of 5115 obese/overweight adults involving 4042 (79.1%) females and 1073 (20.9%) males referred to the weight loss clinic from June 2017 to June 2019 of whom 1870 were overweight and the remaining 3245 were obese. Most (73.1%) of the studied women were in their menopause state while the remaining 1089 (23.9%) were in their pre-menopause. Only 3251 patients with complete data were considered for the analysis and the rest were excluded [Figure 1].

Figure 1 Flow chart of study participants.

Procedure

The medication history of patients was recorded. Patients on low-dose Statins were included since the mentioned doses did not affect serum TG level. We excluded patients with recent (through six months) heart failure, myocardial infarction, or stroke in addition to participants with chronic conditions or rheumatologic diseases, and pregnant women.

An informed consent form was filled by all participants after explaining the aims of the study. Moreover, the Ethics Committee of Tehran University of Medical Sciences approved the protocol of this study. A trained nurse collected the demographic data and information on measurements using a standard checklist for data entry.

Hypertension Definition

The diagnosis of hypertension was made based on BP > 130/80 on two separate office visits or previous treatment with antihypertensive drugs according to the American College of Cardiology (ACC) and the American Heart Association (AHA) guideline for the Prevention, Detection, Evaluation and Management of High Blood Pressure in Adults. Hypertensive patients were grouped as stage 1 and stage 2 when the studied participants had blood pressure of 130–139/80–89 and greater than 140/90, respectively based on American Heart Association (AHA) guidelines.26 We used a standard mercury sphygmomanometer with appropriate cuff size to evaluate the blood pressure in a sitting position.

Measurements

We used a Seca 755 Column Medical Scale for measurement of body weight with an accuracy of 0.1 kg and a standard stadiometer for heights of about 0.1 cm. While recording weights, the patients wore light clothing, and during height measurements, shoes were taken off. Weight divided by height squared (kg/m2) was used for the BMI calculation. 30 > BMI ≥ 25 was determined as overweight and obesity was defined as BMI ≥ 30. Waist circumference was assessed at the most narrow part of the waist. Hip circumference was taken at the maximal protuberance of the gluteal using a single tape.

Anthropometric Indices

The body composition analyzer BC-418 MA (TANITA, Tokyo, Japan) was used for the evaluation of anthropometric indices including total fat percentage, total fat mass, and total free fat mass.27

VAI and LAP, sex specific indices, were calculated using the following equation : (TG and HDL are expressed in mmol/l) For males: VAI = (WC/39.68 + (1.88×BMI)) × (TG/1.03) × (1.31/HDL), For females: VAI = (WC/36.58 + (1.89×BMI)) × (TG/0.81) × (1.52/HDL)15 and LAP = (WC-65) × TG for men and (WC-58) × TG for women.28

BSI was calculated using this formula: BSI = WC/(BMI2/3x height1/2)29 below and WC and height in this index are in meters. BRI was calculated using this equation: 364.2−365.5 .30 BAI was calculated using this equation: ((hip circumference (cm)/height (m)1.5) − 18).20 WHtR of patients is defined as the waist circumference divided by height, with the same units for both measures. WHR is defined as their waist circumference divided by hip circumference, both measured in the same units.31

FMI and FFMI were measured by calculating the total fat mass and free fat mass by body composition analyzer and then using the following formulas: FMI = fat mass/height squared (m2) and FFMI = fat-free mass/height squared(m2).27

Laboratory Investigations

After a 12-hour fasting, patients’ sera were collected to determine the levels of fasting blood sugar (FBS), triglyceride (TG), cholesterol (CHOL), low-density lipoprotein (LDL) and high-density lipoprotein (HDL). For fasting plasma glucose level evaluation, the enzymatic colorimetric technique was implemented. For assessing serum levels of lipids, an Erba Mannheim auto analyzer XL-640 (Erba Diagnostics Mannheim, Germany) with Pars Azmoon reagent kit (Tehran, Iran) was employed. Then, low-density lipoprotein-cholesterol (LDL-cholesterol) level was calculated based on the Fried Ewald’s formula.32 In cases with serum triglyceride levels of more than 400 mg/dl, LDL-cholesterol was directly measured by the enzymatic method and using commercial kits (Parsazmun, Karaj, Iran).

Statistical Analysis

The independent t-test and chi-square test were employed to compare quantitative and categorical variables, respectively between normotensive and hypertensive patients. Pearson’s correlation test was used to examine the association of systolic blood pressure and anthropometric indices. The area under the receiver-operating characteristic curve (AUC) with 95% confidence intervals (CIs) and Youden distance were used to assess the power of each anthropometric measure to discriminate normotensives from hypertensive patients. According to the gender-specific nature of some indices,33 we analyzed the data in two subgroups for men and women. The odds ratios (ORs) and their 95% CIs for the presence of hypertension were estimated by logistic regression analysis. Variables were adjusted for age and sex in the first model, and for age, sex, BMI, and WC in the second model. The SEM (Structural Equation Modeling) method was used to extract latent synthetic obesity scores from the manifest anthropologic indices.34 However, the ordinary linear SEM was not suitable for the association detection between obesity score and hypertension due to the stronger multi-co-linearity relationships between the anthropologic indices. Therefore, we used the PLSPM method to implement the SEM model for new latent combined scores extraction.35 All statistical analyses were performed using IBM SPSS Statistics version 20.0 (SPSS Inc., Chicago, IL, USA) and SmartPLS version 2.0 (Ringle, Wende, and Becker, 2015). P-values < 0.05 were considered statistically significant.

Results

The characteristics of 5115 participants are shown in Table 1. BMI, WHtR, BSI, BRI, total fat mass, total fat-free mass, total fat percentage, FMI, and FFMI were significantly higher in male hypertensives than normotensives while WC, HC, WHtR, VAI, LAP, BAI, BRI, total fat mass, total fat-free mass, total fat percentage, FMI, and FFMI were significantly higher in female hypertensive individuals. BSI and BMI in women whereas WC, HC, BAI, LAP, and VAI were similar in male hypertensives as well as normotensives [Table 1].

Table 1 Age, Anthropometric Measures, Indices and Measure Indicators Adjusted for Gender and Hypertension

Table 2 displays the area under the curve, cut off, sensitivity and specificity of each anthropometric measures for the presence of hypertension in both genders. LAP, WHtR, and BRI revealed the highest diagnostic accuracy for predicting hypertension with AUC of 0.67 and CI 95% of 0.57–0.78, 0.55–0.79, and 0.55–0.79 in females, respectively. Whereas WC and BSI were more accurate measures for predicting hypertension in males, (AUC = 0.70, 0.71, CI 95% = 0.54–0.77, 0.37–0.86) which was closely followed by WHtR (AUC = 0.68, CI 95% = 0.55–0.79).

Table 2 The Area Under the Curve, Cut off, Sensitivity and Specificity of Each Anthropometric Measures for the Presence of Hypertension by Gender

Considering sensitivity, the most sensitive index for hypertension prediction was LAP (sensitivity: 78% and specificity: 52%) for females and WHtR (sensitivity: 74% and specificity: 54%) for males. Concomitantly, BSI was the most specific index (sensitivity: 30% and specificity: 85%) for women and BAI (sensitivity: 53% and specificity: 74%) for men.

Figure 2 shows the AUC values for combined latent indices/scores for male and female groups. We selected three of the strongest correlated manifest indices with patients’ systolic blood pressure to conduct latent combined indices for both genders. BRI, WHtR, and WC were chosen for females, while BRI, FMI, and WHtR were selected for men. Based on the aforementioned latent combined indices, four scores were generated to a different combination of mentioned indices, and the combined scores were approximately similar as the manifest indices with no better discriminating power for hypertension detection.

Figure 2 AUC values for combined latent indices in women and men. Women: Score 1 (BRI, WHtR), Score 2 (BRI, WC), Score 3 (WHtR, WC), Score 4 (BRI, WHtR, WC); Men: Score 1 (WHtR, FMI), Score 2 (WHtR, BRI), Score 3 (BRI, FMI), Score 4 (BRI, WHtR, FMI).

When indices were used to estimate the risk for HTN, the most powerful odds ratios belonged to WC with OR = 13.47 (1.99–45.02) for men and BRI (OR = 3.33 (1.58–7.28)) for women, comparatively higher than those observed for all other indices. Combined latent indices were not better than the manifest [Table 3].

Table 3 Odds Ratio (95% CI) of the Presence of Hypertension for Each Anthropometric Measure by Gender

Discussion

Considering the literature review, to our knowledge, our study is the first one to compare the vast spectrum of indices including ancient and novel parameters in addition to combined scores among populations with an appropriate sample size and revealed BRI and WC to be the best predictors. The aforementioned anthropometric indices for predicting hypertension among overweight/obese patients had a good power of discrimination of normotensive from hypertensive patients in both genders. Similar to our study findings, Chang et al suggested BRI as a potential parameter in hypertension assessment.36 On the other hand, the study findings from Mongolian males, LAP was reported as a better potential HTN predictor than BMI.17 Moreover, Wang et al suggested LAP as a better choice than BAI in association with hypertension among the obese population.37

Our findings advocated the use of ancient indices since they showed WC among men and WHtR among women to be the best predictors than the suggested novel parameters elsewhere. In the same breath, the study done by Lee’s group among Korean obese people38 documented similar findings to ours. According to the two meta-analyses, in which each study extracted more than thirty studies and pooled data comparing ancient obesity indices (BMI, WC, WHR, and WHtR), WHtR has been suggested not only as the strongest hypertension risk predictor but also as the best discriminator of normotensives in hypertensive patients though the pooled studies in these meta-analyses were mostly from China and the studies were heterogeneous.39,40 Conversely, in a study evaluating 622 Jordanian people, WC was introduced as an independent predictor of hypertension.41 It is likely that such differences could occur as a result of differences in ethnicity/race and other sociodemographic factors.

Our findings agreed that latent combined scores were not superior to the manifest indices, neither in predicting hypertension nor in discriminating hypertensive from normotensive patients. Two studies with remarkable sample sizes, approved some superiority for combined indices in comparison to ancient indices (including BMI, WC, HER, and WHtR) using wrapper-based variable selection and Partial Least Squares Path Modeling (PLSPM) method especially among women.42 Different findings of our study and mentioned studies might be explained by different index selections for combined scores construction.43

The strengths of our study include a large cohort of overweight/obese participants from over a two-year period, and employed standardized anthropometric measurements to decrease inter-rater bias. Nonetheless, our findings need to be interpreted cautiously in the context of potential limitations that include lack of socioeconomic information, smoking status, dietary habits, and physical activity level variables of participants. There was also a higher number of women participants which might have resulted in a selection bias though maximum effort was made to compensate for the selection bias through subgroup analysis. In order to support the causality association and overcome the limitation of the present cross-sectional study, further longitudinal studies are warranted.

Conclusion

In summary, the most powerful association between hypertension and sufficient discrimination ability of normotensives from hypertensive patients were detected for BRI in women and WC for men. However, neither the BSI, BAI nor FMI and FFMI showed superiority to WC or WHtR in predicting the presence of hypertension.

Abbreviations

AHA, American Heart Association; AUC, area under the curve; BAI, body adiposity index; BMI, body mass index; BRI, body roundness index; BSI, body shape index; CVD, coronary vascular disease; FFMI, free fat mass index; FMI, fat mass index; HC, hip circumference; LAP, lipid accumulation product; OR, odds ratio; PLSPM, partial least squares path modeling; SEM, structural equation modeling; VAI, visceral adiposity index; WC, waist circumference; WHR, waist-to-hip ratio; WHtR, waist-to-height ratio.

Data Sharing Statement

Research data is confidential but in needed situation, is available through the email contact with corresponding author.

Ethics Approval

The Ethics Committee of Tehran University of Medical Sciences approved the protocol of this study (Code: IR.TUMS.VCR.REC.1397.063). The study was conducted in accordance with the Declaration of Helsinki.

Consent to Participate

A written consent form was obtained from all participants after explaining the aims of the study.

Consent for Publication

All authors approved manuscript for publication.

Author Contributions

All authors contributed to data analysis, drafting or revising the article, have agreed on the journal to which the article will be submitted, gave final approval of the version to be published, and agree to be accountable for all aspects of the work. Maryam Abolhasani and Nastaran Maghbouli contributed equally to this work and share co-first authorship. Haleh Ashraf and Jemal Haidar Ali are shared corresponding authors.

Funding

This study was not funded by any agency.

Disclosure

The authors report no conflicts of interest for this work.

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