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stephanyfulda

stephanyfulda
Joined Feb 2015
stephanyfulda
Joined Feb 2015

Dear NSRR team,

I am currently working on the sof data and the two sets of annotations, the nsrr and the profusion set. As far as I have seen, the event data (leg movements, respiratory events, etc.) are exactly the same in both sets and the profusion set has additional information regarding scoring and montage settings that are not part of the nsrr xml files. The difference that is puzzling me regards the sleep stages which are in the form of start and duration of each block of continuous sleep stage for nsrr while it is a list of 30 s epochs in the profusion file. Besides the two lists having different lengths with the profusion one being longer, the onset of sleep i.e. the first epoch that is not wake, and the subsequent scoring seems to be shifted by exactly 30 s with the nsrr information being 30 s earlier compared to the profusion stages. When I checked the two sets against the actually edf traces in some selected cases, according to how I would score the epoch, it seemed that indeed the nsrr stages are 30 s off. I double-checked my procedures, but it is of course possible that I made an error or missed something obvious, for which I apologize in advance. So the two questions I have are: is the stage scoring information in the two files really different and possible shifted by 30 s? and regarding the different lengths of the sleep staging does the nsrr file uses some additional information to end the staging (it is not merely the post-sleep wake but also additional sleep that is part of the profusion but not nsrr staging)? Thanks very much and with kind regards Steph