Waist circumference is a reliable indicator of metabolic syndrome, says study
Indian children in urban areas are prone to diseases related to obesity even when they have smaller waist circumference as compared to children with similar health condition in developed countries like the US. With obesity among children on the rise in India, lifestyle disorders are becoming a matter of concern among paediatricians.
A study published in the April issue of Journal of Paediatrics shows that children with smaller waist circumference were at risk of developing or having metabolic syndrome or MS.
The acceptable cutoff point
The researchers determined the waist circumference cutoff for risk of MS among children aged 2-17 in India. Children of Jehangir Hospital in Pune, numbering 208, were checked for all parameters linked to MS—height, weight, BMI, waist circumference, blood pressure, levels of fasting triglycerides, high density lipoprotein (HDL) cholesterol and plasma glucose.
The researchers found cutoff values of 70th waist circumference percentile as an appropriate indicator of MS in this group. The finding was then extrapolated to 10,842 children in five Indian cities (Delhi, Chennai, Kolkata, Pune and Raipur). In this group, the researchers measured height, weight, waist circumference and blood pressure only. The results showed that in the category below 70th waist circumference percentile, only 1.3 per cent children were found to suffer from hypertension. However, the number of hypertensive children were significantly higher above it, amounting to 3.3 per cent of the total children.
“As many as 30 per cent of the children in this group had MS or were at risk of developing it,” says Archana Dayal Arya, paediatrician at Sir Ganga Ram Hospital in Delhi and co-author of the study. "Hypertension is a part of MS. This strengthens our claim that 70th percentile is a good cut off," said Arya. “Children in India have metabolic syndrome at smaller waist circumference because of genetic disposition," she added.
The National Health and Nutrition Examination Survey (NHANES), USA, considers 90th percentile as the cut off for considering metabolic syndrome among children. Some other agencies put it between 75th percentile to 85th percentile.
"Indians have more body fat for a particular BMI. Abdominal obesity is a much greater a concern [for them] than [their] western counterparts. The study proposes inclusion of waist circumference as a screening criterion for metabolic syndrome. Waist circumference is a good indicator for predicting health risks over BMI wherein centralised obesity is linked," said Anuradha Khadilkar, consultant paediatrician, Jehangir Hospital, Pune, and co-author of the study.
"We need to develop our own standard because different populations have variations of traits. This study is an effort towards that," said Arya (see table).
|Waist size cutoff values for Indian children|
|Age||Boys (cm/inches)||Girls (cm/inches)|
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