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Arquivos Brasileiros de Cardiologia

Print version ISSN 0066-782X

Arq. Bras. Cardiol. vol.94 no.6 São Paulo June 2010  Epub May 21, 2010

https://doi.org/10.1590/S0066-782X2010005000049 

Prevalence of abdominal obesity in hypertensive patients registered in a Family Health Unit

 

 

Edmarlon GirottoI; Selma Maffei de AndradeII; Marcos Aparecido Sarriá CabreraII

IUniversidade Norte do Paraná - UNOPAR
IIUniversidade Estadual de Londrina - UEL, PR - Brazil

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ABSTRACT

BACKGROUND: Abdominal obesity is an important cardiovascular risk factor and, along with dyslipidemia, impaired glucose tolerance and hypertension, it makes up the metabolic syndrome.
OBJECTIVE:
To investigate the prevalence of abdominal obesity and associated factors in hypertensive patients.
METHODS:
Cross-sectional study with hypertensive patients aged 20 to 79 registered in a Family Health Unit in the city of Londrina, Paraná. Abdominal obesity was found through waist-hip ratio (WHR) and waist circumference (WC) according to the cutoff points recommended by the World Health Organization (WHR > 1.0 and > WC 102 cm for men and WHR > WC 0.85 and > 88 cm for women).
RESULTS:
Among 378 respondents, the prevalence of abdominal obesity determined by WHR was 65.3% in adults and 68.1% in the elderly, and 87.9% in females and 30.2% in males (p <0.001). In women, WHR was associated with reports of high cholesterol, failure to perform regular physical activity, lack of paid work and low education. There was no association of WHR with any variables in males. High waist circumference was present in 66.8% of adults and 64.3% of elderly patients, also with differences between sexes (p <0.001). High waist circumference was associated, in women, to diabetes and to nonsmoking, and in men, to diabetes and to physical inactivity.
CONCLUSION: These results show a high prevalence of abdominal obesity, especially among women, reinforcing the need for strategies to reduce abdominal obesity among hypertensive patients.

Key words: Obesity, abdominal; prevalence; hypertension; health centers.


 

 

Introduction

Hypertension is a major risk factor for cardiovascular disease (CVD)1-3. It is the main cause of admission of a large number of patients in emergency rooms of hospital services1,4. Hypertensive patients require special attention in the control of some comorbidities5 and in early detection of other cardiovascular risk factors6, such as diabetes, sedentary lifestyle, smoking and obesity7.

In this context, abdominal obesity stands apart, as it is considered harmful to health because it is more associated with cardiovascular morbidity and mortality8. Some authors have recently demonstrated the importance of abdominal obesity as a cardiovascular risk factor, especially when associated with dyslipidemia, glucose intolerance and hypertension, making up the metabolic syndrome9,10.

This type of obesity can be determined by anthropometric measurements, abdominal ultrasound and nuclear magnetic resonance11. Although ultrasound and tomography are measures with greater accuracy in the determination of abdominal fat12, anthropometric measurements allow a greater applicability13,14 because they are inexpensive and easy to execute15,16. Moreover, they correlated well with imaging methods, making possible its use in outpatient care units15,17.

Faced with the need for studies to investigate the prevalence of abdominal obesity in people who already have a risk factor for metabolic syndrome, i.e., hypertension, and the importance of determining factors associated with this condition for the purposes of prevention, this study seeks to investigate the prevalence of abdominal obesity and associated factors in hypertensive patients.

 

Methods

This is a cross-sectional study conducted between January and June 2007, with hypertensive patients registered in a Family Health Unit (FHU) in the city of Londrina, Paraná, southern Brazil. The city population estimated for 2008 was 505,184 million inhabitants18, and in the FHU area, about 6,000 inhabitants19.

We studied hypertensive patients aged 20 to 79, registered in at least one of the Family Health Unit's sources of information: Database and Monitoring of Hypertensive and Diabetic Patients (Hiperdia), Basic Attention Information System (SIAB), or appointment sheets used in the service for monitoring and scheduling of return of hypertensive patients. From the intersection of these sources of information, we obtained a number of 695 hypertensive patients. Considering an error of 3.5%, confidence level of 95% and 50% prevalence, we determined a sample of 442 individuals (including estimated losses or exclusions of 20%).

The sampling was systematic and random, with pre-sorting by sex and age, to ensure proportionality. Out of the total sample, 52 were excluded due to change of address to another Family Health Unit area (33), death (6), for being outside the defined age range (1) and for not having any hypertension history (12).

Data were collected through interviews from the homes of patients selected in up to five visits to obtain demographic and economic data, lifestyles, current diseases and anthropometric measurements (waist and hip). Data collection was conducted by interviewers trained and evaluated in theory and practice sessions. Waist and hip measurements were obtained with an inextensible measuring tape with a width of 1.0 cm and minimum unit of 0.1 cm. A prior pilot study was performed to adapt the data collection document to respondents' reality. A re-interview with 10% of the final sample was performed to assess data reliability.

In order to take waist and hip measures, the individual remained standing upright, with as little clothing as possible. Waist measure or waist circumference was obtained by positioning the measuring tape on an imaginary median line between the iliac crest and the last rib at the level of the umbilicus and was taken at the end of the expiratory movement. Hip circumference was measured at the largest extension of the buttocks. In both measures, the tape was positioned in a horizontal position without pressing the soft tissues20.

The dependent variables analyzed were waist-hip ratio (WHR) and high waist circumference (WC). WHR was calculated from the waist circumference divided by the hip circumference. Individuals with abdominal obesity were those with WHR > 1.0 for men and > 0.85 for women. For the waist circumference, cutoff points of > 102 cm for men and > 88 cm for women15 were used.

The independent variables were:

Age group - divided into two, 20 to 59 (adults) and 60 to 79 (elderly).

Education - up to 3rd grade (elementary school or low education) and 4th grade or more.

Paid work - considered positive if the person received any type of earnings (either from registered work or not); otherwise, it is considered negative.

Economic class - as proposed by the Brazilian Association of Research Companies (ABEP) through the Brazilian Economic class Criteria (CCEB), which takes into account the purchasing power of individuals and households and the education of breadwinners21. Respondents were classified into classes A, B or C (best economic conditions) and D or E (worst economic conditions).

Smoking - currently smoking (currently smokes or had quit smoking 12 months or less before the interview) and have never smoked or former smoker (no history of smoking or had quit smoking more than 12 months before the interview).

Intake of alcoholic beverages - categorized into: Regular consumption - (intake at least three days a week) and irregular consumption or non-intake (other cases). The daily amount consumed was not evaluated.

Physical activity - regular physical activity was considered the performance of dynamic exercises (walking, running, cycling, dancing, swimming) at least three times a week for at least 30 minutes per session, as recommended by the V Brazilian Hypertension Guidelines6.

Comorbidities (self-reported) - diabetes, high cholesterol and cardiovascular disease (history of myocardial infarction and/or stroke) were considered if respondents answered affirmatively.

The study was approved by the Ethics Committee of the Universidade Estadual de Londrina (UEL), under opinion 286/06. Interviewees were asked about the objectives of the study and after reading, understanding and signing the informed consent, they answered the questions listed in the data collection document and had their measures checked.

All forms were coded, double entered into a database created in Epi Data 3.1 for Windows, and compared in the same program to correct typographical errors. Tabulation of data was performed using Epi Info version 3.3.2, initially with the distribution of frequencies of variables and measures of central tendency and variability, followed by checking of associations between qualitative variables using chi-square or Fisher exact test when recommended.

 

Results

From 390 eligible hypertensive patients, four could not be found, one refused to participate, and seven could not perform waist and hip measurements. In the end, we studied 378 individuals (96.9%) and 139 (36.8%) men and 239 women (63.2%), with mean age of 58.7 for both sexes. Adults (193) had mean age of 49.2 ± 8.1, and the elderly (185), 68.6 ± 5.5.

Concerning marital status, 63.3% were married, 49.5% had up to three years of study, and 45.8% belonged to economic class D or E. The distribution of socioeconomic, demographic, lifestyle and self-reported comorbidity variables, by sex, is presented in Table 1. This table shows low frequency of regular physical activity among those hypertensive patients under study (20.1%) but higher among men (26.6%) than among women (16.3%) - p <0.05.

The average waist-hip ratio was 0.96 ± 0.07 for men and 0.94 ± 0.08 for women. Waist circumference averaged 98.4 cm ± 11.3 and 99.5 cm ± 12.9 for men and women, respectively.

The prevalence of abdominal obesity determined by WHR and WC was higher in females (87.9% and 82.8% respectively; p < 0.001) than in males (30.2% and 36.0% respectively). Comparing the age groups, the prevalence of high WC and WHR did not differ: 65.3% and 68.1% (WHR) and 66.8% and 64.3% (WC) for adults and the elderly, respectively, considering both sexes.

The prevalences of high WHR and WC by gender and age are shown in Figure 1. There are similarities between the prevalence of abdominal obesity for both measures in women and elderly men, but in male adult individuals, we perceived a difference between the prevalence rates determined by WHR and WC: 24.6% and 40.0%, respectively.

Table 2 shows the prevalence of abdominal obesity measured by WHR and WC in males. We perceive that there was no significant difference in the prevalence of abdominal obesity measured by WHR for the variables analyzed. Concerning waist circumference, men with diabetes had a greater prevalence of high WC, while those who practice regular physical activity had a lower prevalence (16.0%).

In females, there was a higher prevalence of abdominal obesity (measured by WHR) in women with high cholesterol (94.7%) and in those who attended school up to the 3rd grade (94.6%). Women who perform regular physical activity and have paid work had lower prevalence of high WHR. With regard to abdominal obesity as measured by WC, women with diabetes (92.6%) and those who had never smoked (70.3%) had a higher prevalence of high WC (Table 3).

 

 

Discussion

This study found high prevalence of abdominal obesity in this population of hypertensive patients measured both by WHR and by WC.

Such results were obtained in hypertensive patients registered in a Family Health Unit, and their selection was based on the analysis of three sources of information (Hiperdia, Siab and appointment sheets), ensuring greater representation of the hypertensive population in the area. In addition, the study population consists mostly of low income and low education individuals, which is similar to a large portion of the Brazilian society, especially in peripheral regions22.

Characteristics of the population include irregular performance of physical activities (20.1%). Considering that this population has hypertension, regular physical activity helps control blood pressure levels23 and obesity6. However, several studies report sedentary lifestyle as highly prevalent in our society, both in non-hypertensive and hypertensive individuals3,6,24,25.

Importantly, the mean waist circumference and waist-hip ratio found were high. Mean WC (98.4 and 99.5 cm for men and women, respectively) are above the values found in other studies26-29. As for mean WHR (0.96 for men and 0.94 for women), a study with hypertensive patients aged over 45 found similar value for males (0.97), but not for females (0.84)30. In other studies27-29, the mean WHR among both men and women were lower than those found in this study.

Interestingly, Picon et al31 found mean WHR of 0.93 and 0.98 for women and men, respectively, and mean WC of 96.9 cm for women and 99.4 cm for men. These findings are closer to this study. Such similarities may relate to the fact that both studies looked at individuals already with a risk factor for the metabolic syndrome: this one, hypertension; that one, diabetes.

Furthermore, the prevalence of abdominal obesity, determined both by WHR and WC, was higher in females. This higher prevalence among women was also reported in the study conducted with employees of a company in Jaraguá do Sul (state of Santa Catarina), in which high waist circumference was found in 33% of the population, of which 49% were women and 26% were men8. Other studies also found higher prevalence of obesity among women27,30,32. However, in this study, the prevalence of abdominal obesity in women was much higher than that observed in the studies cited, suggesting that this population is more exposed to cardiovascular risks.

In this study, both males and females had high WC associated with diabetes, which was also reported by Cabrera and Jacob Filho33 in patients aged 60 or more.

Among men, the association of high WC with lack of regular physical activity was also detected, which is similar to the findings by Olinto et al32. A study with patients aged 20 to 69 found a higher mean WC among those who did not exercise or who did it three or more times a week, while those who exercised less than three times a week had a lower mean WC26, which may reflect the reverse causality, which is an inherent limitation of cross-sectional studies26.

Worthy of note is that women who perform physical activity had a lower prevalence of high WHR. A study conducted with women aged 55 to 69 showed that the waist-hip ratio was inversely associated with physical activity34. Changes in lifestyle such as high physical activity, leading to the adoption of a healthier lifestyle, should be encouraged by all health care professionals, both to prevent hypertension29 and to control obesity.

The association of abdominal obesity determined by WHR with self-reported high cholesterol in women agrees with the study by Cabrera and Jacob Filho33, although this study has been done only with the elderly. Research conducted with volunteers in the city of Viçosa (state of Minas Gerais) found higher proportions of women with high WC among those with high cholesterol levels35.

In summary, among women, high WHR was more often associated with other cardiovascular risk factors or socioeconomic factors (high cholesterol, physical inactivity, low education and paid employment) compared to high WC (association only with diabetes and smoking). Among men, WHR was not associated with any of the factors studied, while high WC was sensitive to identify the simultaneous presence of diabetes and physical inactivity. These results may suggest that there are differences between these two anthropometric measurements for men and women in the investigation of other health risks, particularly in older populations, due to aging changes in body composition and differences in accumulation of abdominal fat between the sexes36,37. Fuchs et al38 emphasize that although the abdominal circumference measurement has the advantage of being simpler, adjusting it for height or hip circumference increases the predictive power of detecting hypertension, which may also occur with other morbid conditions and other health risks.

Although many Brazilian studies still use cutoff points for WHR and WC recommended by the World Health Organization (WHO), as in this study, there are still doubts about using it for the Brazilian population16,39, especially in women over 4540. A recent paper41 reporting results from a study conducted in Porto Alegre, identified WC cutoff points of 87 cm and 80 cm for men and women, respectively, as the most suitable ones to predict hypertension, at an average follow-up time of 5.5 years. However, this research worked with individuals who had a mean age lower than that shown by hypertensive patients studied in this work.

Anthropometric parameters of abdominal fat probably differ in relation to age. It is known that with aging, there is an expected increase of abdominal fat tissue aging. Thus, the high prevalence of abdominal obesity identified in this study could be partially justified by the high age of individuals sampled (mean age = 58.7). However, we cannot overlook the high prevalence of this type of obesity, especially among women.

It should be noted that this study performed only one waist and hip measurement, and other information collected were self-reported and may underestimate or overestimate the prevalence of certain situations42. In order to reduce potential biases, interviewers were extensively trained and pilot testing was made prior to completion of the study and re-interview of 10% of the sample and double data entry.

Abdominal obesity is associated with atherosclerotic disease10, which may result in complications such as acute coronary events and cerebral aneurysm. Therefore, high levels of abdominal obesity identified in patients with hypertension and, consequently, with a risk factor for metabolic syndrome already installed, justify the use of strategies targeted at providing greater attention to these patients as well as the adoption of activities to promote health in this population group.

 

Conclusion

The results of this study show a high prevalence of abdominal obesity, especially among women, underscoring the need for strategies to reduce abdominal obesity among hypertensive patients. For this purpose, the identification of abdominal obesity, through these simple and low cost measures, should be part of the routine tasks of primary health care to hypertensive patients.

Potential Conflict of Interest

No potential conflict of interest relevant to this article was reported.

Sources of Funding

There were no external funding sources for this study.

Study Association

This article is part of the thesis of master submitted by Edmarlon Girotto, from Universidade Estadual de Londrina - UEL.

 

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Mailing address:
Edmarlon Girotto
Rua Armando Tonelli, 189 - Jd. Vila Romana I
86200-000 - Ibiporã, PR - Brazil
E-mail: eddieuel@yahoo.com.br, edmarlon@unopar.br

Manuscript received May 02, 2009; revised manuscript received August 18, 2009, accepted October 09, 2009.

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