RESULTS
Polysomnographic sleep findings of patients were analyzed for the distribution of sleep stages and other sleep related data.Sleep stages were classified as W (wake), N1 (non-rem1), N2 (non-rem2), N3 (non-rem3) and R (rem). Total recording time, total sleep time, sleep efficiency and the duration of each sleeping stage (W, N1, N2, N3,R) were calculated from the PSG reports (Table 1).
The BIS analysis was performed according to different SQI values. Initially SQI values were divided into three groups (Group 1: 50-70, Group 2: 70-89, Group 3: >90) to calculate BIS averages for each group. When the mean BIS values of these three SQI groups were compared, no significant difference was found between Group 2 and Group 3 as a result of binary comparison of BIS values. There was statistically significant difference between Group 1 and the other groups (Table 2). So we included only the BIS values with an index of SQI over 70 for comparison of BIS values of sleep stages (Table 3).
When the sleep stages were compared, no statistically significant difference was found between the BIS score averages (for SQI values over 70) in stage 2 and REM stages. In all of the other comparisons, there was significant difference in BIS values between the sleep stages (Table 4)