A study of 6,000 14-year-olds found that 11% of boys and almost 27% of girls were diagnosed with benign joint hypermobility syndrome, with 29% and 45% of boys and girls, respectively, having especially flexible fingers. Researchers reported in the journal Arthritis & Rheumatism that the Beighton score -- the criteria used to diagnose the condition -- either has a very low threshold or is not the appropriate assessment tool for children.

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