|Year : 2015 | Volume
| Issue : 1 | Page : 44-49
Prevalence of the metabolic syndrome among North Indian adolescents using Adult Treatment Panel III and pediatric International Diabetic Federation definitions
Riyaz Ahmad Bhat1, Irshad Paray1, Showkat Zargar2, Ashraf Ganie3, Imran Khan1
1 Department of General Medicine, Sher-i-Kashmir Institute of Medical Sciences, Soura Srinagar, Kashmir, India
2 Department of Gastroenterelogy, Sher-i-Kashmir Institute of Medical Sciences, Soura Srinagar, Kashmir, India
3 Department of Endocrinology, Sher-i-Kashmir Institute of Medical Sciences, Soura Srinagar, Kashmir, India
|Date of Web Publication||13-Apr-2015|
Dr. Riyaz Ahmad Bhat
Department of General Medicine, Sher-i-Kashmir Institute of Medical Sciences, Soura Srinagar, Kashmir
Source of Support: None, Conflict of Interest: None
Background and Objective: Childhood obesity is an important risk factor for the development of metabolic syndrome (MS) in children and adolescent. Because of high prevalence of insulin resistance and MS in Indian adult population, studies are needed to identify the prevalence of these metabolic abnormalities in the adolescent population. The objective of this study was to estimate the prevalence of MS using pediatric International Diabetic Federation (IDF) definition and compare it with estimates of Adult Treatment Panel III (ATP III) definition among adolescents in Northern India. Materials and Methods: At a total of 899 adolescents attending school (aged 10-18 years) participated in this population-based prospective study. All the clinical and biochemical assessment were done after proper consent. The MS was determined by the National Cholesterol Education Program ATP III definition modified for age and pediatric IDF definition. Results: The prevalence of MS was 3.5% according to ATP III criteria and 1.5% based on IDF criteria. No significant gender difference was observed in the distribution of MS. Hypertriglyceridemia was the most common and abdominal obesity the least common constituent of MS. Conclusion: This study provides the first estimates of MS using pediatric IDF definition in the adolescent population from Northern India.
Keywords: Dyslipidemia, metabolic syndrome, waist circumference
|How to cite this article:|
Bhat RA, Paray I, Zargar S, Ganie A, Khan I. Prevalence of the metabolic syndrome among North Indian adolescents using Adult Treatment Panel III and pediatric International Diabetic Federation definitions. Arch Med Health Sci 2015;3:44-9
|How to cite this URL:|
Bhat RA, Paray I, Zargar S, Ganie A, Khan I. Prevalence of the metabolic syndrome among North Indian adolescents using Adult Treatment Panel III and pediatric International Diabetic Federation definitions. Arch Med Health Sci [serial online] 2015 [cited 2020 Feb 27];3:44-9. Available from: http://www.amhsjournal.org/text.asp?2015/3/1/44/154944
| Introduction|| |
Insulin resistance syndrome was the first described by Reaven (1988)  as the concomitant presence of abdominal adiposity, dyslipidemia, hypertension, and insulin resistance or type 2 diabetes mellitus and described this syndrome complex as syndrome X. Although researchers coined different terms to this syndrome complex, , the term metabolic syndrome (MS) was coined by Adult Treatment Panel III (ATP III)-National Cholesterol Education Program to use a common definition in the global context and consider other causal factors related with abdominal fat excess. 
Childhood obesity is an important risk factor for the development of MS in children and adolescents.  MS in children and adolescents has been linked to hostile intrauterine environment leading to intrauterine growth retardation, low birth weight and small for gestational age. , Other factors can be genetic, socioeconomic, environmental (obesogenic environment), urbanization, unhealthy diet and increasingly sedentary lifestyle. , Obese children with MS are at increasing risk of progressing to type 2 diabetes and cardiovascular disease in later life.  Early identification of children at risk and preventive action are therefore very important. However, until date, no unified definition exists to assess risk or outcomes in children and adolescents, and existing adult-based definitions of the MS are not appropriate to address the problem in this age group. This disagreement in proposing a unified definition mainly results from the difficulty in establishing cutoff points due to the absence of clinical manifestations of cardiovascular diseases in childhood.  There are doubts whether cutoff points must be absolute or expressed in percentiles considering age, gender, and pubertal stage due to rapid growth in childhood and mainly in adolescence.  Lately, International Diabetic Federation (IDF) proposed a consensus definition of MS for children and adolescents so as to obtain a universally accepted tool, which is easy to use for the early diagnosis. This will also help us to take preventive measures before the child or adolescent develops diabetes or cardiovascular disease, thus becoming the major organization to do so. 
Different studies have shown varied prevalence of MS using different cutoffs and criteria. In the third National Health and Nutrition Examination Survey III conducted between 1988 and 1994 in USA, the prevalence of MS was 6.8% among overweight adolescents and 28.7% among obese adolescents. 
Studies from South Asian children including India have shown prevalence rates ranging from 2% to 9%. , This could be attributed to the high level of insulin resistance among them.  Furthermore, the relation between adiposity and insulin concentrations is stronger in South Asian children than among white Caucasian children.  South Asian children have higher mean fasting levels of insulin and fasting blood glucose and a higher prevalence of impaired fasting glucose than European Caucasians. , Although limited, studies from North India have shown high prevalence of MS like other South Asian studies. , The prevalence estimates of MS using IDF definition are not available from India. We therefore analyzed data according to ATP III definition of metabolic MS, examined its demographic variation and estimated the prevalence according to IDF definition, which happens to be the latest organized definition  in the Northern Indian state of Kashmir.
| Materials and Methods|| |
This cross-sectional population-based study was carried out in a representative sample of 889 children aged 10-18 years selected from different schools. The study was conducted in a multistage manner over a period of 2 years (October, 2009-October, 2011) among children selected by a simple randomization method. There are total six towns among, which four are major and urbanized. There are approximately five to eight schools in each town. Four schools with enrollment more than 1000 were selected from four major towns. All the schools selected were of equal standard with almost equal children population and distribution. From each school, following children were selected in the first phase.
- Children aged 10-18 years.
- Children who had consent from parents.
- Children who were not suffering from any metabolic disease.
- Children not on any medication in any form.
A total of 1100 children (in all the four schools) were selected in this stage. These children were selected by simple randomization. The sample size for the study was calculated from the formula given by Daniel.  This formula is based on the assumption of normal approximation.
Finally, 889 children turned up for the study. The study was approved by Ethical Committee Sher-i-Kashmir Institute of Medical Sciences, Srinagar, Kashmir, Director Education Kashmir and proper approval from respective institutional bodies was obtained. The consent from the parents of children for examination and blood sampling was taken after explaining to them the purpose of the study. A team consisting of 2-3 doctors, a nurse, lab technician and a helper visited each individual school on prefixed dates.
Sampling method and biochemical measurements
Children were asked to come fasting on the day of sampling (≥8 h fast). About 10 ml nonhaparinized venous blood samples were drawn from nondominant arm without using tourniquet. Serum was separated within 2 h of venipuncture, and analysis was done within 24 h. Biochemical parameters were analyzed with commercially available enzymatic reagents (Audit Diagnostics, Ireland) adapted to the Hitachi 912 auto analyzer.
All subjects underwent anthropometric assessment such as measurement of height, weight, body mass index (BMI), waist circumference (WC), and measurement of blood pressure. Body weight was measured by an electronic scale (Filizola ® ) to the nearest 0.1 kg while the school children were barefoot and wearing light clothes. Height was determined by a portable Seca ® Stadiometer to the nearest 1 cm, according to norms proposed by the World Health Organization (1995).  BMI (weight in kilograms divided by the squared height in meters) was calculated by using the measured height and weight and converted to percentiles for age in months and gender by using the Center for Disease Control and Prevention, 2000 growth charts and computer software Epi-Info® version 3.2 (2004).  Indian BMI Percentiles were used to classify children in different classes.  WC was measured midway between the rib cage and the superior border of the iliac crest by using a milli-metric nonextensible and nonelastic measuring tape (Sanny ® ) in mid respiration and inferences were drawn in percentiles.
Blood pressure was measured by the mercury sphygmomanometer method after the child had been sitting at rest for a minimum period of 5 min, and the cuff involved 80% of the right arm's circumference. The arm rested on a support surface at the level of the precordium. Three variable cuff sizes were used according to the child's brachial circumference. Blood pressure was measured 3 times in 3 different days only when the first measurement was above 95 th percentile according to gender, age and height, based on The fourth report on the diagnosis, evaluation, and treatment of high blood pressure in children and adolescents. 
Definitions of metabolic syndrome
Metabolic syndrome was defined using modified ATP III criteria ,, as well as IDF criteria  and the results were compared with each other.
Adult Treatment Panel III criteria modified for age defines the presence of MS when three of the following criteria are met:
- Triglycerides ≥110 mg/dl.
- High density lipoprotein-cholesterol (HDL-C) ≤40 mg/dl,
- Systolic blood pressure or diastolic blood pressure ≥90 th percentile for age and gender.
- WC ≥90 th percentile for age and gender.
- Fasting blood glucose ≥110 mg/dl. 
According to the IDF definition, an individual aged 10-16 years has the MS if he or she has central adiposity (≥90 th WC percentile or adult threshold if lower) plus at least two of the following criteria:
- Triglycerides ≥150 mg/dl.
- HDL-C <40 mg/dl,
- Systolic blood pressure ≥130 mmHg or diastolic blood pressure ≥85 mmHg.
- Fasting plasma glucose ≥ 100 mg/dl or previously diagnosed type 2 diabetes. For those aged ≥ 16 years, the adult IDF definition of the MS was applied. 
Data were analyzed by SPSS 11.5 version. The prevalence was reported in percentages. Factor analysis and inference were drawn using Chi-square test for proportions and Man-Whitney U-test for comparison of independent groups. A two-tailed P value was used for calculating statistical significance. A P < 0.05 was taken as statistically significant.
| Results|| |
Of total 1100 children, 899 children turned up for the study. The sample population of 899 children and adolescents was a heterogeneous population and consisted of 311 males and 588 females. Their mean age was 13.4 ± 3.8. The characteristics of the subjects are shown in [Table 1].
According to ATP III criteria, 3.5% children aged 10-18 years had MS, whereas 1.5% children of similar age group had MS according to IDF criteria [Table 2]. The prevalence of MS in males versus females was statistically insignificant in both criteria. Factor analysis according ATP III criteria showed that hypertriglyceridemia was most prevalent factor followed by low HDL-C, hyperglycemia, hypertension, and WC. Among these factors hypertriglyceridemia and hyperglycemia showed statistically significant difference between two sexes [Table 2].
|Table 2: Unadjusted prevalence of the MS and its components based on ATP III criteria and pediatric criteria from the IDF among North Indian adolescents aged 10-18 years|
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In both criteria, high prevalence of MS was seen in the age group 13-15 years and the difference across different age groups was significant in ATP III criteria. All metabolic parameters except high blood glucose were highly prevalent in the same age group, which corresponds to puberty age. Again abdominal obesity, blood pressure and hyperglycemia showed statistically significant difference across different age groups [Table 2].
The factors which significantly contributed to MS were blood pressure, WC, blood glucose, BMI, fatty liver, and low HDL. Among all these factors WC was the most significant contributing factor (Or-27.8; sensitivity-41, specificity-97; accuracy-95; P = 0.000) [Table 3].
|Table 3: Relationship of individual parameters with the prevalence of MS|
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| Discussion|| |
This study could be the first study from India, which used recently proposed pediatric IDF definition for evaluating the prevalence of MS and compared it with estimates of ATP III criteria. Like its adult definition, the pediatric definition emphasizes the central role of obesity. Studies across the world have shown different prevalence estimates owing to lack of use of uniform definitions in their studies. ,
Low prevalence of MS was observed when IDF definition was applied, which could be due to the fact that the IDF retained the adult cut points of its adult definition.  ATP III uses lower cutoffs for blood pressure and triglyceride levels. Data from India though limited has shown prevalence in nonobese children ranging from 0.8% to 5%. , The prevalence of MS in nonobese children in our study is alarming and needs attention.
Friend et al. did a systematic review of different databases, collected details of overall prevalence and prevalence within groups categorized by obesity, gender, age, and ethnicity. This study was conducted in Scotland. The median prevalence of MS in whole populations was 3.3% (range 0-19.2%), in overweight children was 11.9% (range 2.8-29.3%), and in obese populations was 29.2% (range 10-66%). Within-study analyses confirmed higher prevalence for obese compared to overweight (P = 0.012) and obese compared to nonobese, nonoverweight children (P < 0.001). Within-study analyses also revealed higher median MS prevalence for boys compared to girls (5.1% vs. 3.0%, P < 0.001) and also in older compared with younger children (5.6% vs. 2.9%, P = 0.001).  Similarly, a study from Tailor et al. showed that the prevalence estimates from the general population and community-based sampling ranged from 1.2% to 22.6% with rates of up to 60% observed in the overweight and obese. 
According to Barker's hypothesis, there is a links between reduced birthweight and increased risk of coronary heart disease, diabetes, hypertension, and stroke in adulthood.  A systematic review reported that the majority of 80 studies on adults and children showed that there is a 2-mmHg decrease in systolic blood pressure per kilogram increase in birthweight.  This relationship is less well-defined in adolescence, possibly because "tracking" of blood pressure with age is disturbed at the time of the adolescent growth spurt.
Maximum prevalence (6.8% with ATP and 2.7% with IDF) was seen around the puberty (defined by age and not evidenced clinically or biochemically). No statistically significant difference was seen between two sexes although significant differences were observed across age groups. The effects of obesity on early puberty development have been shown though not conclusively established. , However, effects of puberty on obesity are not known. Normal puberty in girls is accompanied by increases in BMI and subcutaneous adiposity.  Also, lipid abnormalities, particularly in males, are affected by puberty.  Whether these normal physiological processes have any significance in the development of obesity and MS around puberty in susceptible persons needs further elucidation.
Lipid abnormalities in the form of high triglyceride levels are the common abnormalities found in our study along different age groups. These observations are consistent with observations made in other South Asian studies.  Asian Indian population is highly insulin resistant even in the presence of only mild increase of BMI or abdominal adiposity.  Importantly, a higher level of hyperinsulinemia was reported in India neonates, as recorded at birth, compared with White Caucasian neonates. 
| Conclusion|| |
This study provides the first estimates on the prevalence of MS with ATP III and pediatric IDF definition in Northern Indian Adolescent population. Both the definitions showed high prevalence around the age of puberty. Immediate lifestyle modifications are needed to control the obesity epidemic and its metabolic consequences. Furthermore, research is needed to know the effects of puberty on obesity and its late consequences.
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[Table 1], [Table 2], [Table 3]
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