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STUDY OBJECTIVES We aimed to assess ventilatory control in typically developing children with and without obstructive sleep apnea (OSA). METHODS Otherwise healthy children referred for suspicion of OSA were recruited. In addition to polysomnography, we analyzed loop, controller and plant gains (ie, LG, CG, and PG), which reflect the stability of control, chemoreceptor sensitivity and the pulmonary control of blood gases in response to changes in ventilation, respectively, from tidal breathing recordings during wakefulness. Two bivaria