Group Severity of OSAS Sleep quality Daytime tiredness Involuntary falling asleep Nightly arousals Effect of therapy
Pre Post Pre Post Pre Post Pre Post Pre Post
A 3.1 (1.5) 2.3 (1.9) 3.5 (1.0) 3.5 (.8) 3.9 (.9) 3.4 (1.0) 3.7 (1.1) 3.3 (1.1) 2.9 (1.3) 2.8 (1.2) 1.9 (0.7)
B 2.8 (1.7) 2.8 (2.0) 3.5 (.8) 2.8 (1.1) 3.3 (1.2) 2.6 (.5) 1.5 (.5) 2.6 (1.1) 3.5 (.5) 0.6 (.5) 2.2 (0.8)

M (SD) = mean (standard deviation).
The results are shown on a 5 degree scale: 1 is the best, 5 the worst.
The preoperative and postoperative values were compared using Wilcoxon test.
All differences are insignificant (P > 0.05).