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DClinPsy Portfolio Volume 1 of 3 - University of Hertfordshire ...

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5) Background Information and BMI<br />

The information sought included the number, age and gender <strong>of</strong> siblings, ethnicity, living<br />

arrangements, learning sets at school, family history <strong>of</strong> eating disorders/obesity and<br />

mental illness, use <strong>of</strong> non prescribed drugs and alcohol and certain life experiences such<br />

as move <strong>of</strong> house/school, loss <strong>of</strong> a family member/friend accident, illness, bullying,<br />

hospitalisation and abuse.<br />

In addition, a calculation <strong>of</strong> the Body Mass Index (BMI) was undertaken, which uses<br />

weight and height as well as age to indicate body fatness. BMI is considered a reliable<br />

indicator <strong>of</strong> body fatness for most children and adolescents (Lask and Bryant-Waugh,<br />

2000) and was calculated using the Center for Disease Control and Prevention website. It<br />

is calculated by dividing weight in Kg by square <strong>of</strong> length/height (m2). After BMI is<br />

calculated it is plotted on the BMI-for-age and sex growth charts to obtain a percentile<br />

ranking. The percentile indicates the relative position <strong>of</strong> the child’s BMI number among<br />

children <strong>of</strong> the same sex and age.<br />

The BMI-for-age weight status categories differ in the U.K from the U.S. In the U.S<br />

‘underweight’ represents those in less than the 5 th percentile, ‘healthy weight’ the 5 th<br />

percentile to less than the 85 th percentile, those ‘at risk <strong>of</strong> becoming overweight’ the 85 th<br />

to less than the 95 th percentile. Finally the ‘overweight’ group includes those equal to or<br />

greater than the 95 th percentile. For the U.K weight categories ‘underweight’ is less than<br />

the 2nd percentile, ‘healthy weight’ is the 3rd percentile to less than the 90 th percentile,<br />

‘overweight’ is the 91 st to less than the 98 th percentile and ‘obese’ those equal to or<br />

greater than the 98 th percentile.<br />

Data Analysis<br />

Group comparisons were made between the EDR groups in relation to the variables by<br />

carrying out Mann Whitney U Tests and considering the effect sizes using Cohen’s d.<br />

Inflexibility was considered in relation to the key variables by carrying out Pearson’s<br />

Correlational analysis.<br />

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