
==== Front
J Family Med Prim Care
J Family Med Prim Care
JFMPC
J Family Med Prim Care
Journal of Family Medicine and Primary Care
2249-4863
2278-7135
Wolters Kluwer - Medknow India

JFMPC-13-3122
10.4103/jfmpc.jfmpc_1929_23
Original Article
Prevalence and influencing factors of metabolic syndrome among rural adult population in a district of South India
Latha P Swarna 1
Sangeetha S 2
Vijayakarthikeyan M 3
Shankar R 4
1 Post Graduate, Department of Community Medicine, Vinayaka Missions Kirupananda Variyar Medical College and Hospitals, Vinayaka Mission Research Foundation (Deemed to be University), Salem, Tamil Nadu, India
2 Professor and Head, Department of Community Medicine, Vinayaka Missions Kirupananda Variyar Medical College and Hospitals, Vinayaka Mission Research Foundation (Deemed to be University), Salem, Tamil Nadu, India
3 Assistant Professor, Department of Community Medicine, Vinayaka Missions Kirupananda Variyar Medical College and Hospitals, Vinayaka Mission Research Foundation (Deemed to be University), Salem, Tamil Nadu, India
4 Professor, Department of Community Medicine, Vinayaka Missions Kirupananda Variyar Medical College and Hospitals, Vinayaka Mission Research Foundation (Deemed to be University), Salem, Tamil Nadu, India
Address for correspondence: Dr Swarna Latha P, Post Graduate, Department of Community Medicine, Vinayaka Missions Kirupananda Variyar Medical College and Hospitals, Vinayaka Mission Research Foundation (Deemed to be University), Salem – 636308, Tamil Nadu, India. E-mail: swarnadotpsl@gmail.com
8 2024
26 7 2024
13 8 31223128
07 12 2023
17 2 2024
08 3 2024
Copyright: © 2024 Journal of Family Medicine and Primary Care
2024
https://creativecommons.org/licenses/by-nc-sa/4.0/ This is an open access journal, and articles are distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 License, which allows others to remix, tweak, and build upon the work non-commercially, as long as appropriate credit is given and the new creations are licensed under the identical terms.
ABSTRACT

Background:

Metabolic syndrome has increased globally due to sedentary lifestyles, unhealthy diets and obesity, which is posing a substantial burden on healthcare systems. Understanding the determinants of metabolic syndrome like lifestyle factors, socioeconomic status and the environment are vital for devising effective prevention and management. Research into these determinants helps to identify high-risk populations and develop interventions to reduce its occurrence.

Objectives:

i. To estimate the prevalence of metabolic syndrome among the adult population. ii. To determine the factors associated with metabolic syndrome among the adult population.

Methodology:

A cross-sectional study was carried out among 410 adults (≥18 years). A semi-structured questionnaire was used to collect data and National Cholesterol Education Program’s Adult Treatment Panel III criteria was used to diagnose metabolic syndrome. Continuous and categorical data were represented as mean and proportion, respectively. The strength of the association was determined using the prevalence ratio and adjusted prevalence ratio.

Results:

The mean age of the participants was 44.97 ± 14.7, about 58.3% of them were females. Metabolic syndrome prevalence was 39.8%. Multivariate regression analysis demonstrated that being over 40 years old, marital status, higher socioeconomic status, skilled workers, physical inactivity and obesity were independently linked to metabolic syndrome.

Conclusions:

The burden can be reduced by identifying the risk factors at the early stage through screening and by adopting a healthy lifestyle.

Diet
lifestyle
non-communicable disease
risk factor
==== Body
pmcIntroduction

Worldwide, non-communicable diseases (NCDs) have emerged as the primary cause of illness and death, marking a shift from the previous trend of infectious diseases.[1] Within the Southeast Asia region, NCDs stand as leading causes of mortality, claiming around 8.5 million lives annually, with a significant portion being premature deaths. This situation notably impacts the workforce and economic productivity.[2]

In India, approximately 66% of all deaths are attributed to NCDs, which stem from various behavioural and metabolic risk factors.[3] NFHS – 5 Survey revealed alarming statistics related to non-communicable disease risk factors – prevalence of tobacco use (46.9%), alcohol consumption (31.8%), being overweight/obese (46.9%), elevated blood glucose level (29.1%) and having elevated blood pressure (45.3%).[4]

These risk factors are collectively examined under the term “metabolic syndrome” defined by a combination of physiological, biochemical, clinical and metabolic elements directly linked to increased risks of conditions like atherosclerosis, type 2 diabetes mellitus (T2DM) and overall mortality. Metabolic syndrome heightens the likelihood of mortality from similar events compared to individuals without the syndrome.[5]

Various diagnostic criteria are used to identify individuals with metabolic syndrome among which World Health Organisation (WHO) established the first official diagnostic criteria for metabolic syndrome in 1998, identifying individuals with insulin resistance, hypertension, dyslipidaemia and microalbuminuria. The European Group for the Study of Insulin Resistance (EGIR) proposed similar criteria but emphasised that microalbuminuria was not essential for diagnosis. To address the focus on insulin resistance, the National Cholesterol Education Program Adult Treatment Panel (NCEP ATP III) criteria shifted the emphasis to abdominal obesity.[678910]

South Asians, especially Indians, face higher risks of metabolic and cardiovascular diseases due to factors like abdominal obesity and insulin resistance. Estimating the prevalence of metabolic syndrome in India is crucial, considering its diverse sociocultural landscape. This diversity, particularly between urban and rural populations, underscores the need for tailored approaches to address varying risk factors effectively.[11] Understanding these nuances is essential for targeted prevention and management strategies. Recent data indicates that rural areas in the country are mirroring the urban trend, experiencing increasing rates of diabetes and a significant portion of mortality attributed to ischaemic heart disease and stroke. Limited data exists regarding the prevalence of lipid levels, obesity and metabolic syndrome in rural India making it challenging to assess their impact on cardiovascular disease within the rural communities.[12]

With this background, the study was carried out with the following objectives:

To estimate the prevalence of metabolic syndrome among the rural adult population in Salem district.

To determine the factors associated with metabolic syndrome among the rural adult population in Salem district.

Methodology

Study design

Community-based cross-sectional study.

Study area

The study was carried out in the field practice area attached to the Rural Health and Training Centre of the tertiary care hospital, Salem. The area has a population of 13,852 of which 7,039 were male while 6813 were females.

Study period

The study was carried out for a period of 6 months from March 2023 to August 2023 after obtaining Institutional Ethical Committee approval.

Study population

The study participants were adults aged ≥18 years residing in the field practice area attached to the Rural Health and Training Centre of the tertiary care hospital, Salem.

Inclusion criteria

Those who were willing to participate in the study after getting written informed consent were included in the study.

Exclusion criteria

Adults with intellectual disabilities or cognitive impairments, seriously ill patients, and pregnant and lactating mothers were excluded.

Sample size

From Venugopal et al.,[13] the prevalence of metabolic syndrome was 39.6%. Taking this as a reference value sample size was calculated using the formula Z2 PQ/L2 Z = 1.96, P = 39.6, Q = 100–39.6 = 60.3, L = 5% (Absolute Precision). Adding 10% of non-response rate the final sample size was calculated to be 410.

Sampling method

The adult population covered under the rural field practice area is around 9902. The adults were listed from the family folder maintained in our Rural Health Centre and they were serially numbered. The study participants were selected using a simple random sampling technique and random numbers were generated using the Random (RAND) function in Microsoft (MS) Excel.

Informed consent

Consent was prepared in a local language as per Indian Council of Medical Research (ICMR) guidelines. Written informed consent was obtained from the study participants before data collection.

Ethical clearance

Following ethical clearance from the institution Institutional Ethical Committee of Vinayaka Missions Kirupananda Variyar Medical College and Hospitals (VMKVMCH/IEC/23/101), the study proceeded with the principal investigator conducting door-to-door data collection after securing written informed consent. Confidentiality of the collected data was strictly maintained throughout the process.

Data collection

After getting written informed consent from the participant face-to-face interview was done to collect information on socio-demographic characteristics and behavioural risk factors (e.g. tobacco use, alcohol use, physical activity, diet and family history). Measurement of height, weight, waist circumference and blood pressure was taken by the investigator. After overnight fasting 5 ml sample of venous blood was collected in a tube by a trained phlebotomist. Fasting plasma glucose (FPG), triglycerides (TG), total cholesterol (TC), high-density lipoprotein cholesterol (HDL-C) and low-density lipoprotein cholesterol (LDL-C) were measured with a chemical autoanalyser. Metabolic syndrome was diagnosed using the NCEP ATP III criteria.

Data analysis

Data was collected and entered in MS Excel and was analysed using Statistical Package for Social Sciences (SPSS) Software (Version 22). Categorical data was represented using frequency and percentage and numerical data was represented using mean and standard deviation. P value was calculated using the Chi-square test (P < 0.05, considered as significant). The strength of association was assessed using binary logistic regression. Adjusted prevalence ratios and their corresponding 95% Confidence Interval (CIs) were computed after adjusting for confounding variables to identify independent associations with metabolic syndrome.

Operational definitions:

According to the NCEP ATP III definition, metabolic syndrome is said to be present if three or more of the following five criteria are met.[14]

Waist circumference over 40 inches (men) or 35 inches (women)

Blood pressure over 130/85 mmHg

Fasting TG >150 mg/dl

Fasting HDL <40 mg/dl (men) or <50 mg/dl (Women)

FBS >100 mg/dl

Tobacco usage: Current smokers are those who have smoked tobacco products in the last 30 days.[15]

Alcohol consumption: Current episodic heavy drinking was considered as six or more drinks on any day in the past 30 days.[15]

Diet: Participants who ate less than five servings of fruits and vegetables per day were considered to have insufficient fruit and vegetable intake.[15]

Physical activity: Physical activity was analysed using global recommendations by WHO.[16] Adults should get involved in at least 150 minutes of moderate-intensity aerobic physical activity or at least 75 minutes of vigorous-intensity aerobic physical activity.

Obesity: Body mass index (BMI) of ≥30.0 and 25.0–29.9 kg/m2 was considered as obese and overweight, respectively.[15]

Waist hip ratio: Waist hip ratio of >0.90 cm for males and >0.85 cm for females was considered as substantially increased.[15]

Raised blood pressure: Raised blood pressure was defined as having systolic blood pressure ≥140 mmHg and or diastolic blood pressure ≥90 mmHg or being previously treated for hypertension.[15]

Results

The demographic profile of the study participants is provided in Table 1. The mean age of the study participants was 44.97 years and the standard deviation of 14.7. More than half of the study participants were females (58.3%). Most of the study participants were Hindu (89.5%) by religion and were married (67.8%) and 46.8% belonged to lower socioeconomic status.

Table 1 Socio-demographic details of the study participants

Socio-demographic variables	Frequency (n=410)	Percentage	
Age			
 >40 years	241	58.8	
 ≤40 years	169	41.2	
Sex			
 Male	171	41.7	
 Female	239	58.3	
Religion			
 Hindu	367	89.5	
 Christian/Muslim	43	10.5	
Education			
 ≥Higher Secondary	111	27.0	
 <Higher Secondary	299	73.0	
Occupation			
 Skilled worker and above	97	23.7	
 Below skilled worker	313	76.3	
Marital status			
 Married	278	67.8	
 Others	132	32.2	
Socioeconomic status			
 Upper/middle class	217	52.9	
 Lower class	193	47.1	
Type of Family			
 Nuclear family	287	70	
 Joint family/three Generation family	123	30	
#Others: Single, widow and divorced.

Figure 1: The prevalence of metabolic syndrome was found to be 39.8% (95% CI: 35–44.7%).

Figure 1 Prevalence of metabolic syndrome

Figure 2: Among the behavioural risk factors, the prevalence of unhealthy diet and Physical inactivity was found to be 92.9% and 58.05%, respectively.

Figure 2 Prevalence of behavioural risk factors among the study population

Figure 3: Among the metabolic risk factors, hypertension and diabetes mellitus were seen in 51.5% and 41.5% of the study participants, respectively.

Figure 3 Prevalence of metabolic risk factors among the study population

The association between demographic variables, risk factors and the metabolic syndrome is given in Tables 2 and 3. Age more than 40 years (Prevalence Ratio [PR] – 2.771, p value – < 0.001**), married persons (PR – 2.243, p value – <0.001**), upper/middle socio economic status (SES) (PR – 1.555, p value – 0.030*), physical inactivity (PR – 2.232, p value – <0.001**), tobacco consumption (PR – 3.148, p value – 0.001**), unhealthy diet (PR – 3.078, p value – 0.011*) and overweight/obese (PR – 3.548, p value – <0.001**) were identified as risk factors to develop Metabolic Syndrome (MS)

Table 2 Association between Sociodemographic factors and the Metabolic Syndrome

Variable	Metabolic Syndrome	P	PR (CI)	
	
Yes (n=163)	No (n=247)	
Age					
 >40 years	119	122	<0.001**	2.771 (1.809–4.244)	
 ≤40 years	44	125		1 (Reference)	
Sex					
 Male	77	94	0.065	1.457 (0.976–2.176)	
 Female	86	153		1 (Reference)	
Marital Status					
 Married	127	151	<0.001**	2.243 (1.430-3.517)	
 Others#	36	96		1 (Reference)	
Education					
 ≥Higher Secondary	42	69	0.629	0.895 (0.572–1.401)	
 <Higher secondary	121	178		1 (Reference)	
Occupation					
 Skilled & above	37	60	0.710	0.915 (0.573–1.461)	
 Below Skilled	126	187		1 (Reference)	
SES					
 Upper/Middle	97	120	0.030*	1.555 (1.043-2.321)	
 Lower	66	127		1 (Reference)	
*P<0.05, **P<0.01. #Others–Single, Widow, Divorce

Table 3 Association between Risk factors and the Metabolic Syndrome

Variable	Metabolic Syndrome	P	PR (CI)	
	
Yes (n=163)	No (n=247)	
Physical Inactivity					
 Yes	110	119	<0.001**	2.232 (1.479–3.370)	
 No	53	128		1 (Reference)	
Tobacco Usage					
 Yes	52	32	0.001**	3.148 (1.196–5.171)	
 No	111	215		1 (Reference)	
Alcoholic					
 Yes	26	38	0.877	1.044 (0.606-1.797)	
 No	137	209		1 (Reference)	
Unhealthy Diet					
 Yes	157	221	0.011*	3.078 (1.238–7.655)	
 No	6	26		1 (Reference)	
BMI Grading					
 Overweight/Obese	99	75	<0.001**	3.548 (2.342–5.373)	
 Normal	64	172		1 (Reference)	
*P<0.05, **P<0.01

Table 4 Binary logistic regression analysis showed that age > 40 years (Adjusted Prevalence Ratio [APR] – 2.827, p value – <0.001**), upper/middle SES (APR – 1.833, p value – 0.021*), physical inactivity (APR – 2.632, p value – 0.008**) and overweight/obese (APR – 3.137, p value – 0.001**) were independently associated with MS.

Table 4 Binary logistic regression findings

Variable	Metabolic syndrome	
	
P	APR (CI)	
Age	<0.001**	2.827 (1.723–4.638)	
Marital status	0.061	1.403 (0.451–2.579)	
SES	0.021*	1.833 (1.095–3.069)	
Physical inactivity	0.008**	2.632 (1.194–3.222)	
Tobacco usage	0.122	1.557 (0.888–2.730)	
Unhealthy diet	0.987	1.008 (0.377–2.694)	
BMI grading	0.001**	3.137 (2.482–5.158)	
*P<0.05; **P<0.01. #Others: Single, widow and divorced. Age, marital status, socioeconomic status, physical inactivity, tobacco usage, unhealthy diet and BMI grading were chosen for binary logistic regression and analysis was done using the Enter method

Discussion

Metabolic syndrome, a lifestyle-related condition, poses a significant health challenge due to factors like urbanisation, sedentary lifestyle, lack of physical activity and excessive calorie intake. Its prevalence varies among populations due to differences in genetics, diet, activity levels, age and body weight. However, a higher prevalence increases the risk of cardiovascular disease.[17]

The prevalence of metabolic syndrome was 39.8% in our study, which was similar to Venugopal et al.,[13] Banerjee et al.[18] and Sinha et al.[19] study findings. In India, studies show different prevalence ranging from 9.2% to 47.4%.[202122] Differences in metabolic syndrome criteria, study settings and epidemiological characters of the study population have contributed to the wider prevalence range of metabolic syndrome observed in India.

While our study identified variations in metabolic syndrome occurrence among different age groups, we did not observe a significant rise in prevalence with advancing age, in contrast to findings by Pathania et al.[20] and Sarkar et al.[23] Our study observed a decrease in prevalence among those over 60 years, contrary to prior findings, possibly due to differences in population demographics and diagnostic criteria. This highlights the need to carefully consider these factors when interpreting prevalence rates.

Male preponderance of metabolic syndrome is a well-documented phenomenon globally. Men are more susceptible to central obesity and females traditionally have lower risk due to reduced intra-abdominal fat.[24] Whereas in our study higher prevalence was noted among females (52.8%) compared to males (47.2%), attributed to larger female participants. This aligns with the findings of studies by Kapil et al.,[25] Lokanath et al.[26] and Pemminati et al.[27]

The rural community due to lifestyle transition exhibits unhealthy dietary patterns, insufficient physical activity and a lack of awareness about the importance of exercise and weight management. Consequently, the prevalence of metabolic syndrome tends to be escalating among the rural population.[17]

In our study ages more than 40 years, upper SES, physical inactivity, tobacco consumption and unhealthy diet were identified as risk factors for developing MS, which is similar to that of Venugopal et al.[13] study. However, alcohol consumption was identified as a risk factor by Selvaraj et al.,[28] Trisrivirat et al.[29] and Mattoo et al.[30] and lacks significance in our study primarily due to the predominance of female participants and varying population demographics.

An unhealthy diet was identified as a risk factor for metabolic syndrome as established by other studies.[2831] However, this differs from Sinha et al.,[19] Ramesh et al.[32] findings where they did not observe its significance, likely due to the use of different criteria. Metabolic syndrome was found to be significantly more common among those who were physically inactive and being overweight or obese. The results were similar to the findings from studies by Selvaraj et al.,[28] Kapil et al.[25] and Srinivasan et al.,[17] observed similar associations between physical inactivity and metabolic syndrome risk. Additionally Sinha et al.[19] and Barik et al.[24] found that as BMI increases, there is a rise in the prevalence of metabolic syndrome.

Conclusion

Metabolic syndrome holds the potential to significantly diminish an individual’s quality of life and impose a burden on healthcare systems. Detecting potential issues early on involves focusing screening efforts on individuals aged 30 years and above with a positive family history, regardless of gender, facilitating timely identification. Thus, Information Education Communication (IEC) and behavioural change communication are vital at individual, family, and community levels to enhance awareness, education and prevention by advocating healthy lifestyles, regular physical activity and improved dietary habits to mitigate the risk factors associated with metabolic syndrome.

Policymakers and healthcare providers can design effective and timely interventions for both primary and primordial prevention by addressing metabolic syndrome’s risk factors. Additionally, further research is needed to ascertain and compare the prevalence of risk factors in various Indian settings.

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.

Acknowledgement

We acknowledge the efforts of team members, participants, local panchayat and laboratory technicians for their commitment and support in data collection.
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