Table 1.

Demographic data

Parameters	Values
Age (years)	42.1±11.8
Gender (male/female)	167/218
ASA PS
I	240
II	145
Grade of surgery
Major	62
Intermediate	242
Minor	81
Surgical specialty
General surgery	225
Gynecology	82
ENT	78

The data is expressed as mean±SD or n. SD=Standard deviation, ASA PS=American Society of Anesthesiologists physical status, ENT=Ear-nose-throat