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Physical performance (6-minute walk distance) in children and young adults with CKD according to age. Light bars represent males and dark bars represent females. SD scores for each participant were calculated using age- and sex-specific normative values (15). The boxes represent the 25th (bottom), 50th (middle), and 75th (upper) percentile for each group. The error bars represent the 5th and 95th percentiles, and the dots represent outliers.
