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Hopkirk, no its not "ethnic children" not uless you count white children from the Isle of Wight!!
Southampton Hospital is curnetly leading the research, and Hampshire and IOW is mainly white with few ethnic minoritys compared to some parts of the UK, we also have the highest sunlight levels, and a high level of middle classes. The reason is believed to be as Sqod says is lifstyle, kids just don't play out, do enough sport and are protected with sun screen, and are given lifts to school etc.