CHICAGO—Use of simvastatin by children with neurofibromatosis type 1 (NF1), a genetic disorder that can cause learning disabilities, did not result in improved cognitive function, according to a study in the July 16 issue of JAMA.

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CHICAGO—New research documents the decline in physical activity among children, with less than a third meeting recommended physical activity guidelines by the time they are 15 years old, according to a study in the July 16 issue of JAMA.

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CHICAGO—To celebrate 125 years of publication, JAMA will republish online groundbreaking studies that have appeared in the Journal, along with Commentaries on the studies, throughout the coming year.

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CHICAGO—Older adults who have hip or knee replacement surgery for severe osteoarthritis may take several weeks to recover but appear to have excellent long-term outcomes, according to a report in the July 14 issue of Archives of Internal Medicine, one of the JAMA/Archives journals.

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