Increasing prevalence of obesity in primary school children: cohort study

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Abstract
Height was measured to 0.1 cm with a free standing Magnimeter stadiometer (Raven, Dunmow). Weights were recorded to 0.1 kg without shoes or jumpers. The mean of three triceps measurements was taken.4 Body mass index (weight (kg)/(height (m)2)) was calculated and converted to standard deviation scores using the revised 1990 reference standards5 and the Tanner Whitehouse (1975) standards for skinfold thickness.4 The following conventional cut-off points were applied: body mass index standard deviation score greater than 1.04 (85th centile) for overweight and greater than 1.64 (95th centile) for obesity. Using these definitions the expected percentages were 15% for overweight and 5% for obesity, relative to British children in 1990. Observed levels were compared with expected levels using χ2 goodness of fit test.

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