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Metabolic syndrome among pre- and post-menopausal rural women in Bangladesh: result from a population-based study

BMC Research Notes volume 6, Article number: 157 (2013) Cite this article

Abstract

Background

Prevalence of non-communicable diseases are a challenging problems among menopausal women specially in a least developed country like Bangladesh, where majority of women suffering from at least one chronic diseases after menopausal age. So, the main objective of this study was to determine the prevalence of metabolic syndrome and related risk factors in Bangladeshi pre- and post-menopausal women living in the rural setting.

Methods

This study is based on a community based cross-sectional survey among 1802 rural women aged ≥15 years. Metabolic syndrome was defined according to the criteria of NCEP-ATP III. Logistic regression was used to estimate the association between menopausal status and metabolic syndrome and its components.

Results

Metabolic syndrome was presented in 25.6% respondents and it was more prevalent among post-menopausal (39.3%) as compared to pre-menopausal (16.8%) women. Logistic regression analysis reveals that prevalence of metabolic syndrome was 1.78 times higher in post-menopausal women than pre-menopausal women (P = 0.001). Prevalence of high blood pressure, elevated fasting blood glucose, and high triglyceride were significantly higher in post-menopausal women than pre-menopausal women (P < 0.05). However, prevalence of low high-density lipoprotein cholesterol was significantly lower in post-menopausal women than pre-menopausal women (P < 0.001).

Conclusions

Metabolic syndrome seems to be a major health problem among post-menopausal women in many developing countries like Bangladesh and proper policy emphasis should be given on its prevention and control.

Background

The prevalence of chronic non-communicable diseases such as cardiovascular diseases and type 2 diabetes is increasing significantly in Bangladesh[1]. This increase is observed not only in the urban areas but also in the rural population, especially rural women in Bangladesh seems to be more vulnerable who are mostly poor and physically active[2]. The metabolic syndrome (MS) is a cluster of risk factors including obesity, glucose intolerance, dyslipidemia, and hypertension that increase the risk for cardiovascular disease and type 2 diabetes[3, 4]. A striking increase in the number of people with the MS has taken place worldwide not only in developed countries but also in developing countries considerably due to changing environment and lifestyle[5].

Previous studies have showed that MS and cardiovascular diseases are more common in women above 55 years of age with significant increase in individual risk factors in the postmenopausal phase[6, 7]. Changing hormonal milieu with decreasing estrogen and alteration of its ratio with testosterone has been implicated as a causal factor for the emergence of MS at menopausal transition[8, 9]. Besides menopausal hormonal changes, aging also play roles to clustering of cardio-metabolic risk factors[10]. Questions remain whether menopause has a causative contribution to the deteriorating metabolic profile that is independent of chronological aging.

Prevalence of MS among pre- and post-menopausal women has varied according to different population. To date, several previous studies found a significance difference in prevalence of MS among pre- and post-menopausal women[11–17]. However, studies related to MS and menopausal status is limited in South Asia[14]. South Asian women, in general are prone to have MS at a younger age and have severe morbidity and mortality consequences as compared to Caucasians and other Asians[18, 19]. Several studies found that menopausal status is influentially linked to some features of MS[11, 14, 16]. However, data on the empirical study of MS in Bangladesh are very rare. So far no studies have been conducted in Bangladesh to determine the prevalence of MS among pre- and post- menopausal women who are mostly poor and have limited or no access to health care services. In our previous studies we found that prevalence of metabolic syndrome was nearly 31% among rural women in Bangladesh, more than 85% rural women have low HDL cholesterol and nearly 31% have high fasting blood glucose[20, 21]. Thus, it becomes necessary to measure prevalence of MS in Bangladeshi rural women focusing menopausal status for taking an early lifestyle interventions and treatment to prevent many non-communicable diseases in rural population as they are now confronting with an emerging health epidemic of MS. Thus, the objective of this study is to estimate the prevalence of MS in Bangladeshi rural women considering their menopausal status and further examined the association between menopausal status and MS and its components.

Methods

Study procedure and subjects

In a community based cross-sectional study of rural women, a total of 1802 participants aged ≥15 years were selected using stratified multistage random sampling. This sample size was sufficient to test all the research hypotheses at the 5% level of significance with a power of 80% (β = 0.20). Subjects were excluded having chronic illness such as hypothyroidism, pregnant women, those on hormone replacement therapy (HRT) as well as women with known illness such as ischaemic heart disease (IHD), diabetes and hypertension. The study uses the World Health Organization’s STEPS approach (modified) which entails stepwise collection of the risk factor data based on standardized questionnaires covering demographic characteristics, somatic illnesses, somatic and mental symptoms, medications, life style, and health-related behavior (step 1), basic physical measures (step 2) and basic biochemical investigations such as blood glucose and cholesterol (step 3). Women were defined as post-menopausal if they had reported their last menses to be at least 12 months previously; pre-menopausal if they had an unchanged and regular menstrual pattern during the last five years, without typical climacteric complaints; and peri-menopausal if last menses to be within or before 12 months and were not regular. In our study we excluded peri-menopausal women. A standard questionnaire on health and menopausal status written in the local language was used to identify the pre- and post-menopausal subjects.

The study was carried out in 4 village communities of GabindagonjUpazilla (subdistrict) of Gaibandha district, a poor district of the northern division of Rajshahi, the poorest region of the country. The respondents were selected randomly after selecting division, district, Upazila and villages. Women were recruited through local announcement (loudspeaker) at community level and surveyors visits. The details of the study procedure have been described before in our previous study[21, 22]. In brief, for getting required information, the participants were interviewed and examined clinically at mobile examination centre and asked to provide a blood sample. The study was approved by the Ethical Committee of the Health and Disease Research Center of Rural Peoples (HDRCRP), Dhaka, Bangladesh. This study conformed to the principles outlined in the Helsinki Declaration, and all subjects gave their written informed consent before inclusion in the study.

Anthropometric measurements

Anthropometric measurements on individuals wearing light clothing and without shoes were conducted by well-trained examiners. Height was measured to the nearest 0.1 cm using the portable stadiometer. Weight was measured in the upright position to the nearest 0.1 kg using a calibrated balance beam scale. Body mass index (BMI) was calculated by dividing weight (kg) by height squared (m2). Waist circumference measurements were taken at the end of normal expiration to the nearest 0.1 cm, measuring from the narrowest point between the lower borders of the rib cage and the iliac crest. Blood pressure was measured twice in the right arm in a sitting position using the standard mercury manometer and cuff, to the nearest 2 mmHg, with the initial reading taken at least 5 minutes after the subject was made comfortable, and again after an interval of 15 minutes. The average systolic and diastolic blood pressures were then estimated.

Biochemical analysis

Blood for biochemical analysis was obtained from the participants after 10–12 hours of an overnight fast. The blood sample was collected using standard blood sample collection procedure. After venipuncture of blood the processed serum/plasma were immediately stored at HDRCRP main or sub-center offices. The serum was immediately separated by centrifugation, and the concentration of triglycerides [lipoprotein lipase method; Wako Chemicals, Tokyo, Japan], total cholesterol [Cholesterol E, Wako Pure Chemical Industries, Ltd. Osaka, Japan] and its fractions high-density lipoprotein (HDL) cholesterol [HDL cholesterol with the Determiner-L kit (Kyowa Co Ltd, Tokyo, Japan)] were ascertained. Fasting plasma glucose [glucose with the Hexokinase G-6-PDH kit (Wako Pure Chemical Industries Ltd, Osaka, Japan) were also measured. After labeling blood sample vials, a part of blood were transported to National Centre for Global Health and Medicine (NCGM), Japan for advanced biochemical assessment processing.

Definition of metabolic syndrome and risk factors

We defined the metabolic syndrome (MS) using the National Cholesterol Education Program Adult Treatment Panel III (NCEP-ATP III)[23]. As detailed in the NCEP-ATP III report, participants having three or more of the five following criteria were defined as having the MS: high blood pressure (≥130/≥85 mmHg), elevated fasting blood glucose (≥110 mg/dL or ≥ 6.1 mmol/L), high triglyceride (≥150 mg/dL or ≥1.65 mmol/L), low high-density lipoprotein (HDL) cholesterol (<50 mg/dL or <1.30 mmol/L), and abdominal obesity, as measured by a waist circumference of ≥88 cm for women. Participants who currently reported using antihypertensive or antidiabetic medication (insulin or oral agents) were counted as having high blood pressure or elevated fasting blood glucose, respectively.

Statistical analyses

The clinical and laboratory characteristic of study population are presented according to pre- and post-menopausal women. The significant differences between pre- and post-menopausal women were assessed by using the Student’s “t” test for continuous variables and chi-square (χ2) test for categorical variables. Logistic regression analyses were used to assess the association between menopausal status and MS and each of its components. Two types of models were used. The first model was crude model without any adjustment and the second model was adjusted for age. Statistical significance was set at the conventional P < 0.05. All analysis were performed using statistical software STATA version 12.0 (Lakeway Drive, College Station, Texas USA).

Result

The clinical and laboratory characteristics of the study population stratified by menopausal status and MS are presented in Table 1. A total of 1802 subjects turned out for data analysis. There were 1094 pre-menopausal and 708 post-menopausal women (ratio 1:1.55); and their ages ranged from 15–85 (mean 39.98 ± 13.97) years. Figure 1 shows the age and menopausal status distribution of the study subjects. Most (45.20%) of the study subjects were in the 45–54 year age group. There were more pre-menopausal than post-menopausal women across all age groups. The pre-menopausal women were aged 15–51 years (mean 31.36 ± 9.24) while post-menopausal women were aged 32–85 years (mean 53.31 ± 8.49) (P < 0.001).

Table 1 Means of clinical and laboratory characteristics of the subjects
Full size table
Figure 1
figure 1

Age distribution of respondents by menopausal status.

Full size image

The prevalence of MS and metabolic risk factors are presented in Table 2. Prevalence of MS was 25.6% in our study, where 39.3% of post-menopausal women versus 16.8% of pre-menopausal women had MS (P < 0.001). Prevalence of metabolic risk factors including elevated fasting blood glucose, high blood pressures, and high triglycerides were significantly higher in post-menopausal women than pre-menopausal women (P < 0.001). However, prevalence of low HDL cholesterol was significantly lower in post-menopausal women than pre-menopausal women (P = 0.001).

Table 2 Frequency of metabolic risk factors and metabolic syndrome
Full size table

Table 3 shows odds ratio (OR) and 95% confidence interval (CI) of MS and each component of MS according to menopausal status. In unadjusted model the prevalence of MS was 3.14 times more likely (CI: 2.52-3.92) in post-menopausal women than pre-menopausal women (P < 0.001). After adjustment for age the association was slightly attenuated but remains statistically significant (OR: 1.78, CI: 1.26-2.51, P = 0.001). Prevalence of elevated fasting blood glucose, high blood pressures, and high triglycerides were also significantly higher but prevalence of low HDL cholesterol were significantly lower in post-menopausal women than pre-menopausal women even after adjustment for age (P <0.05 for all).

Table 3 Odds ratio (95% Confidence interval) for metabolic syndrome and its components by menopausal status
Full size table

Discussion

In this cross-sectional study of Bangladesh we compare prevalence of MS and risk variables of MS in pre- and post-menopausal women and also identified how these variables relate to one another. This is the first report in Bangladesh investigating the prevalence of MS and each component of MS risk factors among rural women according to their menopausal status.

The prevalence of MS was higher in post-menopausal (39.3%) women than pre-menopausal (16.8%) women in our study and this prevalence was more likely in post-menopausal women even after adjustment for age. Our findings are consistent with many of previous studies[11, 13–16, 24], where post-menopausal women have been found to be at higher risk of MS than pre-menopausal women. Ruan et al., found that the prevalence of MS was 34% among Chinese post-menopausal women[24]. According to a study of Western India the prevalence of MS was 45% among pre-menopausal women, whereas it was 55% among post-menopausal women[14]. In another study of India, a prevalence of 22.2% in the pre-menopausal as compared to 32.2% in the post-menopausal group was reported[25]. Arguing menopause as an independent predictor of MS, Eshtiaghi et al., showed a prevalence of 53.5% MS in post-menopausal Iranian women, on the other hand it was only 18% in pre-menopausal women[13]. Taken together, post-menopausal women are more prone to have MS than pre-menopausal women in Bangladesh.

The transition from pre- to post-menopause may be associated with each feature of the MS. In our study metabolic risk factors including high blood pressures, high triglyceride, and elevated fasting blood glucose are significantly higher among post-menopausal women than pre-menopausal women. However, prevalence of low HDL cholesterol is significantly lower in post-menopausal women than pre-menopausal women. In agreement with the results of our study, many previous studies have reported higher concentrations of hypertension[11, 15, 26], hypercholesterolemia[15], hypertriglyceridemia[5], and elevated fasting blood glucose[11, 15] among post-menopausal women than pre-menopausal women. The decreased prevalence of low HDL cholesterol among post-menopausal women than pre-menopausal women is supported by a previous study[27]. Nonetheless, lower prevalence of low HDL cholesterol among post-menopausal women than pre-menopausal women is at variance with other studies[11, 15]. Further research is required to elucidate the inconsistencies among studies.

The emergence of metabolic risk factors in post-menopausal phase may be a direct result of ovarian failure with estrogen deficiency. Decrease in estrogen production is thought to be responsible for substantial proportion of increased cardio-metabolic risk factors in post-menopausal women. Changes in metabolic risk factors during pre- and post-menopause may be due to a combination of factors of the aging process. Although previous studies showed age as the predominant variable associated with increased prevalence of MS, but higher prevalence of MS among women >50 years compared with men of the same age has been reported[28]. In our study the association between menopausal status and each component of metabolic MS was not significantly changed even after adjustment for age, which implies that post-menopausal women were indeed at higher risk of having MS and cardiovascular diseases.

In our study we found no significant difference in obesity component including BMI and waist circumference. Our findings are consistent with two previous studies of India[14] and Iran[16]. In addition, in a Framingham study[29] no significant difference was detected between BMI of pre- and post-menopausal women. However, significant differences in central body fat and BMI among pre- and post-menopausal women have been found in many other studies[11, 15]. During menopause the pattern of hormone secretion changes and gradually causes fat accumulation in visceral tissues of abdomen and as a result, central obesity. However, the literature to date is not clear as to menopause itself is directly associated with obesity. Results of our study demonstrated that although there was no significant difference in abdominal obesity, the risk of MS was more prevalent among post-menopausal women due to significant difference among other component of MS. Differences in socio-environmental and genetic factors, lifestyles, type of menopause (natural/surgical) could be some of the reasons for this variability.

To the best of our knowledge, our study is the first to demonstrate the prevalence of MS and its components among pre- and post-menopausal women in a low-income country like Bangladesh. One of the major strengths of the present study is that it is based on the largest community-based and comprehensive MS survey. However, our study has several limitations that need to be mentioned. First, an association derived from a cross-sectional study does not necessarily indicate causality. Second, menopausal status was self-reported and could have recall bias. Third, our study may have selection bias during cases recruitment due to selection of rural women from lower socioeconomic class and may not be generalized to the whole Bangladeshi women.

Conclusions

In conclusion, the results of our study suggest that the prevalence of MS in post-menopausal women was significantly higher than pre-menopausal women. Low HDL cholesterol, elevated fasting blood glucose, and high blood pressures were the most frequent features in comparison to the others. Prevention through changes in lifestyle, or early detection and treatment of elevated fasting blood glucose, hypertension, and hyperlipidemia are necessary for prevention of many chronic diseases in Bangladeshi women reaching after menopausal status. Health professionals should consider the post-menopausal women as a major target group for prevention of MS, which is an underlying condition of many non-communicable diseases.

Abbreviations

MS:

Metabolic syndrome

BMI:

Body mass index

HDL cholesterol:

High-density lipoprotein cholesterol

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Acknowledgements

The authors thank the study subjects for their cooperation and participation. This work was supported in part by a Grant-in-Aid for Scientific Research (overseas academic) from the Ministry of Education, Culture, Sports, Science and Technology of Japan (22406025) and Japan Society for the promotion of Science. A part of this work has also been supported by research grant from Uehara Memorial Foundation (Japan).

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Authors and Affiliations

  1. Health & Disease Research Center for Rural Peoples (HDRCRP), 14/15, 1st Floor, Probal Housing Ltd., Shekertak (Adjacent to Shekertak Road 1), Mohammadpur, Dhaka, 1207, Bangladesh

    Subrina Jesmin, AM Shahidul Islam, Shamima Akter, Md Majedul Islam, Sayeeda Nusrat Sultana & Naoto Yamaguchi

  2. National Center for Global Health and Medicine (NCGM), 1-21-1 Toyama, Shinjuku-ku, Tokyo, 162-8655, Japan

    Subrina Jesmin, AM Shahidul Islam, Shamima Akter, Md Majedul Islam, Sayeeda Nusrat Sultana, Osamu Okazaki, Masao Moroi, Michiaki Hiroe & Sosuke Kimura

  3. Department of Public Health, Tokai University Graduate School of Medicine, Isehara, Japan

    Tetsu Watanabe

  4. Graduate School of Medicine, Faculty of Medicine, University of Tsukuba, Tsukuba, Ibaraki, 305-8575, Japan

    Kawano Saturo & Taro Mizutani

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The authors declare that they have no competing interests.

Authors’ contributions

SJ developed the idea for this paper, wrote the first draft of the manuscript and extensively edited the manuscript; AMSI and SA contributed to statistical analysis and writing results; MMI, and SNS performed all searches and compiled the text; NY, MH, MM and TW provided conceptual and editorial input. All authors equally contributed to discussion and approved the final version of manuscript.

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Jesmin, S., Islam, A.S., Akter, S. et al. Metabolic syndrome among pre- and post-menopausal rural women in Bangladesh: result from a population-based study. BMC Res Notes 6, 157 (2013). https://doi.org/10.1186/1756-0500-6-157

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