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SPO2 between the three study groups. 1: before the surgery, 2: 15 min during surgery, 3: 30 min during surgery, 4: 45 min during surgery, 5: 60 min during surgery, 6: 75 min during surgery, 7: at the moment of recovery entry, 8: 15 min in recovery, 9: 30 min in recovery, 10: 45 min in recovery, 11: 60 min in recovery.
