Psg calculations Questions and Answers Rated A+
How to you calculate the Total Recording Time (TRT)? Epoch number of "Lights on" - Epoch number "Lights out" / 2 How do you calculate Total Sleep Time (TST)? Total epochs of N1 + N2 + N3 + R / 2 How do you calculate Sleep Period Time (SPT)? Last epoch of sleep - first epoch of sleep / 2 How do you calculate percentage of time in each sleep stage (% N1, % N2, % N3, % R)? % N1= minutes of N1 / TST x 100 % N2 = minutes of N2 / TST x 100 % N3 = minutes of N3 / TST x 100 %R = minutes of R / TST x 100 How do you calculate percentage of wake time? Minutes of W / TRT x 100 How do you calculate Wake after sleep onset (WASO)? Total minutes scored W between the epoch of sleep onset and the last epoch scored as asleep
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