us and uk school years

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Britain is starting to overtake America in obesity rates, with the latest figures showing that more children in England are classed as obese at the age of 11 than in the US.
The proportion of US children aged 9 to 11 who are obese is 18.5%. The figure for children in their final year of primary school in England is at a record high of 20%.

References:

http://www.thetimes.co.uk/article/obesity-rate-in-uk-children-doubles-during-primary-school-years-to-top-us-figure-jz0d9txvs
http://prosperoteaching.com/from-overseas/uk-key-stages-by-age-year/