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. Author manuscript; available in PMC: 2015 Apr 1.
Published in final edited form as: J Neurosurg Anesthesiol. 2014 Apr;26(2):167–171. doi: 10.1097/ANA.0000000000000028

Figure 1.

Figure 1

Time is in number of hours after the conclusion of surgery. Extubated at time zero was defined as extubated intra-operatively at the conclusion of the surgery.