Does anyone know what's the difference between 'total sleep time' (slptime) and "sleep time" (slpprdp) from the polysomnography measures?
I assume one is with (slptime) and the other is without (slpprdp) taking into account wake time whilst in bed?
Also I can't seem to find total sleep time at SHHS2.
Sorry, this is a bit confusing with things labeled similarly but with different underlying data. slpprdp is the most commonly used variable for "total time spent asleep between sleep onset and lights on" and it is the denominator for the AHI variables. It is available for SHHS1 and SHHS2.
At a glance, I think slptime is something that was recorded by the sleep scorer on a grading/quality sheet. It probably isn't the most useful variable. If you wanted to have a "total time in bed" variable (includes sleep latency, sleep time, and wake time from lights off to lights on), I would suggest timebedp.
Yes that's what I was looking for. thanks!