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Change in hypercapnia in children with hypoventilation. Change in %total sleep time end-tidal carbon dioxide > 50 mmHg in randomized subjects who had hypoventilation on the baseline polysomnogram with follow-up data on endpoint polysomnogram (n = 25 eAT group; n = 15 WWSC group). eAT, early adenotonsillectomy; WWSC, watchful waiting with supportive care.
