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Methods: Using a multi-stage random sampling, we screened 1005 school children (501 girls and

504boys) with the mean age of 12.39±3.25 year (range 6-19) from 5 different educational area of Tehran for the presence of JHM by a 0 to 9 scoring method; Carter-Wilkinson& Beighton system. Results: Generalized JHM (defined as a score≥ 5) was found in 23.9% of the children, 14.1% of boys and