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The Hidden Burden of Diabetes Mellitus in an Urban Community of Southwest Ethiopia

Authors Tesfaye Yunka T, Berhanu Mogas S, Zawdie B, Tamiru D, Tesfaye Y, Kebede A, Tadesse M, Kebede Gudina E, Sena Dadi L

Received 28 June 2020

Accepted for publication 5 August 2020

Published 19 August 2020 Volume 2020:13 Pages 2925—2933

DOI https://doi.org/10.2147/DMSO.S269386

Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 2

Editor who approved publication: Professor Ming-Hui Zou


Temamen Tesfaye Yunka, 1 Solomon Berhanu Mogas, 2 Belay Zawdie, 3 Dessalegn Tamiru, 4 Yonas Tesfaye, 5 Ayantu Kebede, 2 Mulualem Tadesse, 6 Esayas Kebede Gudina, 7 Lelisa Sena Dadi 2

1School of Nursing and Midwifery, Jimma University, Jimma, Oromia Region, Ethiopia; 2Department of Epidemiology, Jimma University, Jimma, Oromia Region, Ethiopia; 3Department of Biomedical Sciences, Jimma University, Jimma, Oromia Region, Ethiopia; 4Department of Nutrition and Dietetics, Jimma University, Jimma, Oromia Region, Ethiopia; 5Department of Psychiatry, Jimma University, Jimma, Oromia Region, Ethiopia; 6Department of Medical Laboratory, Jimma University, Jimma, Oromia Region, Ethiopia; 7Department of Internal Medicine, Jimma University, Jimma, Oromia Region, Ethiopia

Correspondence: Temamen Tesfaye Yunka
School of Nursing and Midwifery, Jimma University, P.O.Box-378, Oromia region, Ethiopia
Tel +251913153299
Email tekanetesfu@gmail.com

Introduction: Early detection of the unrecognized diabetes mellitus (DM) and its risk factors in the community is crucial to minimizing the burden of DM and associated complications. Hence, this study aimed to assess unrecognized DM and its relationship with behavioral characteristics, physical characteristics, and lipid profile among adults in Jimma Town, Southwest Ethiopia.
Methods: A community-based cross-sectional study was conducted on 915 adults in Jimma Town from June 17 to July 27, 2019. Physical measurements, lipid profile, and blood sugar levels were measured. The collected data were entered and analyzed using Epi Data 3.1 and SPSS version 21, respectively. Multivariable logistic regression was fitted to assess predictors of unrecognized DM where adjusted odds ratio (AOR) with its corresponding 95% confidence interval (CI) was used to assess the strength of association at P-value ≤ 05.
Results: The prevalence of unrecognized DM and impaired glucose metabolism (pre-diabetes) were 3.1% (95% CI; 2.0– 4.4) and 14.8% (95% CI; 12.5– 17.2), respectively. The risk of unrecognized DM was higher among male participants (AOR = 2.94, 95% CI: 1.19, 7.29), age group of 35 years and above (AOR = 3.45, 95% CI: 1.16, 10.27), and high waist circumference (AOR = 4.21, 95% CI: 1.72, 10.33). On the other hand, participants who perform sufficient physical activity (AOR = 0.14, 95% CI: 0.03, 0.58) had low risk of undetected DM.
Conclusion: The prevalence of unrecognized diabetes mellitus was relatively high. Male sex, advanced age, physical inactivity, and high waist circumference were found to be predictors of unrecognized DM. Thus, awareness needs to be created among the community to practice regular physical activity and maintaining normal body weight. Additionally, screening of DM should be promoted for early detection, prevention, and treatment.

Keywords: unrecognized DM, diabetes mellitus, adult, lipid profile, physical measurement

Introduction

Diabetes mellitus (DM) is a metabolic disorder characterized by high blood glucose levels due to either decreases the production of insulin or resistance of the body to insulin. The three main types of diabetes are type 1 diabetes (T1D), type 2 diabetes (T2D), and gestational DM (GDM).1 Individuals with DM have a higher risk of developing several serious life-threatening complications resulting in reduced quality of life, increased medical care costs, and mortality.2,3 The morbidity, mortality, and burden related to diabetes are significantly increasing in developing countries particularly in Africa. These are due to sedentary lifestyles, growing urbanization cultures, decreased physical activities, and increased alcohol use, smoking habit, and dietary changes.4

Globally, the prevalence of diabetes has intensified widely. According to the International Diabetes Federation (IDF), the estimated 463 million (9.3%) adults aged 20–79 years had diabetes in 2019. It is predicted that the number will increase to 578 million (10.2%) and 700 million (10.9%) in 2030 and 2045 respectively.5 Similarly, the World Health Organization (WHO) projected that diabetes will be the seventh leading cause of death by 2030.6 Sadly, more than half (50.1%) of people with DM are unaware of their disease and most of them (84.3%) were found in low and middle-income countries. In Africa, nearly 60% of all people living with diabetes were undiagnosed.5,7

In sub-Saharan Africa, the burden of DM among adults aged 20–79 years was estimated to be 10.8 million with four countries alone: South Africa, Nigeria, DR Congo, and Ethiopia; accounting for about 60% of all adults living with DM in the region.7 Ethiopia is one of the top countries with the highest number of people affected by DM in Africa.8 According to the 2017 IDF report, the prevalence of DM among adults aged 18–99 years was 4.8% and total diabetes-related death was 31,536. Moreover, about two-thirds of adults with diabetes mellitus has been reported to be undiagnosed in the country.9

There are different factors for the high rate of undiagnosed DM for many years, which includes lack of awareness in the general population and health care providers, poor health systems and slow onset of the symptoms.10,11 Late diagnosis and treatment of DM are associated with the increased occurrence of acute and chronic complications.12 Subsequently, this affects patients’ quality of life,13 incurs additional costs to households,14 and overburdens health care systems.15 Thus, routine screening and early detections is a current global approach to mitigate the progression of diabetes mellitus.16

Early diagnosis and intervention of DM have a massive benefit to at risk individuals through preventing or delaying the onset of DM and reduce the burden associated with subsequent complications. This is only possible when pieces of evidence are available on the extent and risks of DM. In this regard, limited studies conducted in different parts of the country; have neither reported the relationship between diabetes and lipid profile nor comprehensively addressed behavioral characteristics, physical measurements, and lipid profile. Therefore, this study aimed to determine unrecognized DM and its relationship with behavioral characteristics, physical measurement, and lipid profile of Ethiopian adults. Such data would help to design evidence-based effective community-level DM prevention and control mechanisms.

Patients and Methods

Study Design, Setting and Period

A Community based cross-sectional study was conducted from June 17 to July 27, 2019, in Jimma Town. The town is found in Oromia Regional State, Southwest Ethiopia 352 km from capital city Addis Ababa.

Population, Sample and Sample Technique

Adults aged ≥ 18 years who are resided in the town for at least six months preceding the study were considered as the study population. However, adults who have physical deformity (kyphosis, sclerosis), known DM patients, and pregnant women were excluded from this study. The sample size for this study was estimated by using single population proportion formula with the assumptions of 11.5% prevalence of undiagnosed DM in East Gojjam, Northwest Ethiopia,17 95% confidence interval (CI), 3% margin of error, 10% nonresponse rate and 2 design effect which yielded the final sample size of 955.

Multi-stage sampling technique was employed; from 17 Kebeles (the lowest administrative structure in Ethiopia) of the town, six Kebeles were randomly selected. Then, the sample was allocated to the selected Kebeles in proportion to the total number of households in each Kebele, who were selected systematically by using a list of households as a sampling frame. For households with more than one eligible study subjects, lottery method was used to select the participants.

Data Collection and Measurements

Data were collected using the WHO STEPS Questionnaire18 adapted to the local context based on the study objectives. The data collection tool was initially prepared in English and translated to the local languages Afaan Oromo and Amharic. The questionnaire was pretested in Agaro town before two weeks applying it to the final data collection which has similar characteristics with study area to detect any possible problems in the flow of the questionnaires, gauge the length of time required for interviews, feasibility, and the clarity of the language used. A stepwise approach to collect socio-demographic data, behavioral characteristic, physical measurements, and biochemical measurements were done. Data were collected by seven trained professional nurses who were recruited based on their qualifications, prior experience of data collection, and abilities to speak the local languages. The data collectors were trained for four days before the actual data collection on interviewing approach, sample taking, anthropometric measurement, and data recording. All interviews and measurements were done with close supervision of the research team.

Demographic and Behavioral Characteristics

Data on socio-demographic and behavioral characteristics were collected through face-to-face interviews using an interviewer-administered questionnaire. Socio-demographic data include age, sex, educational level, marital status, occupational status, and income; behavioral characteristics including alcohol consumption, smoking habit, Khat chewing, and physical activity. Physical activity was measured by using the WHO physical activity questionnaire. Based on this, an adult person should do at least 150 minutes of moderate-intensity work or 75 minutes of vigorous-intensity work per week. If the self-reported physical activity did not fit with the WHO recommendation, participants were categorized as physically inactive. Sedentary behavior was measured by asking about the time spent sitting during a typical week. The responses were classified as <4 hours/day and ≥4 hours/day.19

Khat chewing and tobacco use were defined as self-reported current chewing of Khat and use of smoked tobacco or smokeless tobacco products respectively. Alcohol use defined as a person who consumed alcohol in the past 12 months.20

Physical Measurements

In this step, the height and weight needed to calculate body mass index (BMI), waist circumference, waist to hip ratio, and blood pressure were taken. The height of the study participants was measured to the nearest 0.1 cm using a stadiometer (Seca Germany) with the subjects positioned at the Frankfurt Plane and the four points (heel, calf, buttocks, and shoulder) touching the vertical stand and their shoes taken off. Before starting the measurements, the stadiometer was checked using calibration rods. Weights were measured using a digital weight scale to the nearest 0.1 kg with the subjects wearing light closes and shoes taken off. The validity of the scale was checked using an object of a known weight every morning and between the measurements. Then, BMI was calculated by weight in kilograms divided by height in meters squared formula. BMI< 18.5 kg/m2 is considered as underweight, 18.5–24.9 kg/m2 as normal, 25–29.9 kg/m2 as overweight and ≥30 kg/m2 as obese.

Waist circumferences (WC) were measured at the midway between the lowest costal margin at the mid-clavicular line and the anterior superior iliac spine using fixed tension tape. WC values > 94cm for men and >80cm for women were considered high according to the WHO recommendation.21

Blood pressure (BP) was taken in a sitting position from the right arm. It was measured in triplicate using an Aneroid Sphygmomanometer with small, medium, and large cuff size,22 as fit to the subjects after five minutes of rest. The subsequent measurements were done five minutes apart. According to the WHO recommendation, the mean systolic and diastolic blood pressures were considered for analysis. Prehypertension is defined as systolic BP of 120–139 and diastolic BP 80–89mmHg. Hypertension is defined as systolic BP of ≥140mmHg and/or diastolic BP of ≥90 mmHg.23

Biochemical Measurements

Random and fasting blood glucose, high-density lipoprotein (HDL), low-density lipoprotein (LDL), triglyceride (TG), and total cholesterol (TC) level measurements were done. The laboratory parameters were determined according to the laboratory standard operating procedures. Five (5) mL venous blood was collected to determine participants’ random and fasting blood glucose levels and lipid profiles. Serum was carried out in ABX Pentra 400 Automated Chemistry Machine (Horiba ABX SAS, 34184 Montpellier, France) at Jimma Medical Center (JMC) Clinical chemistry core laboratory to determine random and fasting blood glucose and lipid profile. Low-density lipoprotein level was calculated by using Freidwald formula.24 The diagnosis of DM was based on the American Diabetes Association and IDF diabetes mellitus classification criteria with fasting blood glucose (FBG) of ≥126 mg/dl and random blood glucose (RBG) of ≥200 mg/dl being considered as positive for DM; Pre-diabetes, FBG: ≤100 mg/dl to <126 mg/dl and RBG: ≤140 mg/dl to <199 mg/dl.25,26

TC ≥ 200 mg/dl considered as high and if it is <200 mg/dl as normal; the optimal level of LDL is less than 100 mg/dl otherwise it is defined as high. Triglycerides level is considered as normal when it was less than 150 mg/dl and HDL is considered as desirable if it is >40 mg/dl for men and >50 mg/dl for women, otherwise, it was classified as low.27 A laboratory technologist, who does not know the participant’s history or other measurements, determined all laboratory values.

Data Processing and Analysis

First, the data were checked for completeness and consistency and double entered into EPI data software version 3.1 and exported to SPSS version 21 for analysis. Descriptive statistics were used to summarize the background characteristics of study participants. Bivariate and multivariable analyses were used to assess the association between explanatory variables and the outcome variable. All explanatory variables with p-values ≤0.25 in the bivariate analysis were entered into a multivariable logistic regression model to assess the independent predictors of DM. The strength of the associations between predictor variables and DM were measured using adjusted odds ratios (AORs) with their corresponding 95% confidence intervals (CIs) at P-value ≤ 0.05.

Results

Socio-Demographic Characteristics

A total of 915 adults with a response rate of 95.8% participated in the study. The mean age of the study participants was 38.4 ± 13.5 years. Males accounted for 52.0% and 71.5% of the study participants were married. About 84% of the study population had some levels of formal education (Table 1).

Table 1 Socio-Demographic Characteristics of Recruited Subjects (n=915)

Behavioral Characteristics

More than one third (35.1%) of the participants were chewing Khat during the study period. Moreover, 16.7% and 7.9% of participants were current alcohol drinkers and smokers respectively. Only 34.0% of the participants could be considered as physically active and 58.0% spent more than 4 hours per day by sitting or reclining (Table 2).

Table 2 Behavioral Characteristics of Sampled Adults (n=915)

Physical and Biochemical Measurements

More than one-fourth (27.8%) of the participants were overweight or obese with a BMI of ≥25kg/m2 and 21.2% of the respondents had unrecognized hypertension. On other hand, 23.7% had central obesity based on their waist circumference and 13.8% of the participants had total cholesterol more than 200 mg/dl (Table 3).

Table 3 Physical and Biochemical Characteristics (n=915)

Prevalence of Unrecognized Diabetes Mellitus

The prevalence of unrecognized diabetes mellitus was 3.1% (95% CI; 2.0–4.4), whereas 14.8% (95% CI; 12.5–17.2) of the study participants had prediabetes.

Factors Associated with Unrecognized Diabetes Mellitus

In the bivariate analysis, sex, age, alcohol drinking, BMI, waist circumference, physical activity, triglyceride, and total cholesterol were found to be significantly associated with DM.

Independent risk factors associated with unrecognized DM on the multivariable logistic regression analysis were sex, age, physical activity, and waist circumference. Males were about three times (AOR = 2.94, 95% CI: 1.19, 7.29) more likely to have unrecognized DM than females. The risk of unrecognized DM was more than three times (AOR = 3.45, 95% CI: 1.16, 10.27) higher in those study participants age 35 years and above compared to those in the age group below 35 years. The risk of developing DM among participants who perform sufficient physical activities was 86% (AOR = 0.14, 95% CI: 0.03, 0.58) less likely compared to those who perform insufficient physical activities. Moreover, the study participants with high waist circumference were 4.21 (AOR = 4.21, 95% CI: 1.72, 10.33) times more likely to have unrecognized DM compared to those who had a normal waist circumference (Table 4).

Table 4 Bivariate and Multivariate Regression Analysis to Identity Risk Factors Associated with Unrecognized Diabetes Mellitus (n=915)

Discussion

The current study revealed that the overall prevalence of unrecognized DM among respondents was 3.1%. This finding is comparable with findings of studies done in Indonesia (3.5%),28 Northwest Nigeria (4.3%),29 Gilgel Gibe Field Research Center, Ethiopia (3.8%),30 and Dire Dawa town (3.3%).31 However, the current study found a relatively higher proportion of unrecognized DM than the study conducted in Kenya (2.4%),16 Benin (1.4%),32 Southern Ethiopia, Sidama zone (1.9%),33 and rural Koladiba town (2.3%).34 This discrepancy might be due to differences in socio-demographic characteristics of study participants, study setting, and sample size. Compared to studies conducted in Kenya, Benin, and Sidama zone, Ethiopia, the present study purely conducted among urban residents where the risk of diabetes mellitus is relatively high. The different levels of economic development and urbanization cause changes in lifestyle which includes a low level of physical activities, increase sedentary behavior and nutritional transition, higher intake of unhealthy foods that are rich in calories. Moreover, studies done in rural Koladiba town, Ethiopia has conducted relatively small samples compared to the current study. Thus, as the sample increases the chance of detecting unrecognized diabetes mellitus might be increased. Another reason for the discrepancy might be due to study participants in the current study exercising risky behaviors. For instance, about two-thirds (66.0%) of them were physically inactive, 58% had sedentary behaviors and 35.1% had Khat chewing behavior, which could be the risk factor for DM.

On another hand, the risk of unrecognized DM was lower than studies done in Monastir City, Tunisia (27.4%),35 East Gojjam zone, Ethiopia (11.5%),17 and Pakistan (26.3%).36 The difference might be due to disparity in genetic, lifestyle, and age group of the study population. The current study included adults 18 years of age and above, whereas the Tunisia study comprised an elderly population of 65 years and above, and in East Gojjam zone, Ethiopia included age 25 years and above. Hence, different pieces of evidence including our study supported that the risk of occurrence of DM was significantly higher among older age groups compared to younger age groups.17,33,3740 Conversely, the increased prevalence of DM in Pakistan study might be due to the use of Oral Glucose Tolerance Test (OGTT) and HbA1c for diagnoses DM in addition to FBG and RBG which used in our study. This might be amplified the detection rate of diabetes mellitus in the case of Pakistan’s study.

The present study revealed that the risk of unrecognized DM was significantly higher among males compared to females, which is consistent with other studies.30,41,42 Even though the reason for this difference is not clear, studies suggested that males have increased visceral fat deposition, which may cause insulin resistance and hyperglycemia. This might be contributing to an increased risk of diabetes development.43,44 This also supported with current study; 81.6% of larger waist circumference was from male participants. Besides, this disparity likely due to differences in lifestyle (decreased physical activity, increased high-calorie intake, high sugar, and high fat) and work-related stress.45

The recent study also found that the risk of unrecognized DM was increased with advancing age. This is in line with previous studies conducted around the world.16,17,31,37,4648 This is most likely due to a decline in lean body mass and an increase in body fat, particularly visceral adiposity which may contribute to the development of insulin resistance, the tendency of low physical activity, and increased body weight.44,49 This also supplemented with the present study. Of the total participants who had central obesity (high waist circumference), 73.7% were in the age group 35 years and above. Moreover, pancreatic β-cell mass in adults exists in an active state such that the cells can undergo compensatory changes to maintain circulating glucose concentrations within a narrow physiologic range. While, as age increases the capacity of pancreatic β –cells regeneration is decreased and enhances sensitivity to apoptosis. Consequently, this causes a decrease in insulin sensitivity and the inadequate response of β-cell functional mass when there is insulin resistance.50

Consistent with findings of previous studies,30,39,40,46,47 the current study revealed sufficient physical activities reduce the risk of unrecognized DM. This is because physical activities minimize the risk of hyperglycemia through increasing insulin-stimulated glycogen synthesis, enhancing muscle glucose uptake, making the muscle being more sensitive to the actions of insulin and it balances the average caloric intake and expenditure by the body cells.51

Similar to the previous research reports,28,33,37,52,53 the occurrence of unrecognized DM is higher among adults with central obesity (larger waist circumference). This might be because, in individuals with expanded abdominal fat accumulation, adipose tissue releases highly active hormones (adipokines), increased amount of free fatty acids, glycerol, pro-inflammatory cytokines, and other factors that are involved in the development of insulin resistance and impairment of glucose homeostasis.54

Even though the risk of unrecognized DM was not significantly associated with the lipid profiles in the current study, evidence showed that the elevated levels of TGs, TC, and LDL cholesterol and low level of HDL cholesterol had a high risk for developing DM. This is because the situation may lead to dysregulation in glucose metabolism by inducing insulin resistance and beta-cell dysfunction.55

The strengths of this study were its being community based and involving an adequate sample. While the major limitation of the study is that only FBG and RBG were used to diagnose DM, which might underestimate the prevalence of unrecognized DM, and we suggest that using HbA1c for future similar studies. The study also did not consider acute and chronic illnesses which may affect the blood sugar level. In addition, the study did not addresses psychological factors apart from substance use which might be risk factors for DM.

Conclusion

The prevalence of unrecognized diabetes mellitus among adults Jimma town was relatively high. Male sex, advanced age, physical inactivity, and central obesity (high waist circumference) were found to be predictors of unrecognized DM. Thus, awareness creation activities targeting adults should be devised regarding to regular physical activity and maintaining normal body weight. Additionally, screening of DM should be promoted for early detection, prevention, and treatment.

Abbreviations

AOR, adjusted odds ratio; BMI, body mass index; BP, blood pressure; CI, confidence interval; COR, crude odds ratio; DM, diabetes mellitus: FBS, fasting blood sugar; HDL, high-density lipoprotein; IDF, International Diabetes Federation; JMC, Jimma Medical Center; LDL, low-density lipoprotein; NCD, non-communicable diseases; OGTT, Oral Glucose Tolerance Test; RBS, random blood sugar; TC, total cholesterol; TG, triglyceride; WC, waist circumference; WHO, World Health Organization.

Data Sharing Statement

The datasets used for the current study is available from the corresponding author upon reasonable request.

Ethical Approval and Consent to Participate

Ethical clearance was obtained from Jimma University, Institute of Health Ethical Review board. A letter of support was obtained from Jimma town and communicated to selected Kebele administrations. Besides, before data collection written informed consents was obtained from each study participant. All the participants’ information was kept confidential using coding system. Participants identified with diabetes and pre-diabetes were advised and linked to nearby health facilities for further investigation and management.

Acknowledgments

Jimma University is greatly acknowledged for the financial support of the study. The authors are grateful to the study participants for taking their time to provide information. Research assistants are also appreciated for their immense contributions.

Author Contributions

All authors made substantial contributions to conception and design, acquisition of data, analysis and interpretation of data; took part in drafting the article or revising it critically for important intellectual content; gave final approval of the version to be published; and agree to be accountable for all aspects of the contents of the article.

Disclosure

The authors declare that they have no competing interests.

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