Age-related Trajectories of Sit-to-stand Performance by Physical Activity Level: A Multicenter Study. - Otto-Yáñez, Matías; Benavides-Córdoba, Vicente; Rodríguez-Castro, Jenifer; Dávila-Oña, Sofía; Morales-Satan, Mauricio; Teixeira, Ana Clara; Nazar-González, Sebastián; Cruz-Montecinos, Carlos; Blanco, Isabel; Torres-Castro, Rodrigo (American Journal of Physical Medicine & Rehabilitation, 2026)