The area of atelectasis was 5.5 , 0-16 .9 cm ( 2 ) ( median and range ) , and 6.8 , 0-27 .5 cm ( 2 ) in the groups given FIO2 0.3 or FIO2 1.0 before removal of the LMA , a difference that was not statistically significant ( P = 0.48 ) .