Prolonged episodes with SpO2 < 88 % of > 60 seconds duration ( median , 115 episodes [ range , 67-240 ] vs 54 episodes [ range , 7-184 ] ; P < .01 ) and of > 180 seconds duration ( median , 13 episodes [ range , 6-39 ] vs 2 episodes [ range , 0-5 ] ; P < .01 ) decreased significantly during the automated period .