We found a good-to-excellent reproducibility of tests and criteria for GJH and BJHS. Future research on the validity of the tests and criteria for joint hypermobility is urgently needed.

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Motor competence and physical activity are not reduced in primary school children at 8 years of age with GJH or BJHS. It is recommended that a potential negative influence on the musculoskeletal system over time, as a result of GJH, be investigated by longitudinal studies.