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Anteroposterior (AP) range and root mean squared (RMS) AP velocity. Graphs show group M ± SD of (A) AP range and (B) RMS AP velocity of center of pressure displacement in adults (A), older children (OC), and younger children (YC) in single (S) versus dual-task (D) conditions in wide stance (WS) and in modified tandem Romberg stance (RS).
